EXHIBIT 10.1


A.Prot.
2001/154
SaleAndPurchAgt A Prot 2001 154 Cu VER1
dated May 28/29, 2001
of the Notary Stephan Cueni
at Basel, Switzerland







         -----------------------------------------------


                   SALE AND PURCHASE AGREEMENT

         -----------------------------------------------



                          regarding the
                    sale and purchase of the



                         Dental Business
                      of the Degussa Group






                                       1










                        Table of Contents

  Exhibits / Schedules..........................................3
  Definitions...................................................4

A.  CURRENT STATUS............................................. 9

  1.  Current Status........................................... 9

B.  SALE, PURCHASE AND ASSIGNMENT, PURCHASE PRICE..............13

  2.  Sale, Purchase and Assignment of the  German Limited
  Partnership Interest, the Foreign Shares and the Brazilian
  Local Management Shares......................................13
  3.  Sale, Purchase and Assignment of the Japanese
  Shareholder's Loan; Interim Financing Facility...............14
  4.  Purchase Price...........................................15

C.  EFFECTIVE DATE ACCOUNTS, SIGNING DATE, EFFECTIVE DATE,
CLOSING DATE AND CLOSING.......................................18

  5.  Effective Date Accounts..................................18
  6.  Signing Date, Effective Date, Closing Date and Closing...20

D.  REPRESENTATIONS AND WARRANTIES, REMEDIES AND INDEMNITIES...22

  7.  Representations and Warranties of Sellers................22
  8.  Representations and Warranties of Purchasers
      and Guarantor                                            31
  9.  Remedies.................................................33
  10. Environmental Indemnity..................................36
  11. Tax Indemnity............................................39
  12. Expiration of Claims; Limitation of Claims...............41

E.  COVENANTS, NON-COMPETE UNDERTAKING.........................42

  13. Covenants / Purchasers' Indemnity........................42
  14. Non-Compete Undertaking..................................45

F.  MISCELLEANOUS..............................................46

  15. Restriction of Announcement, Cooperation and
  Confidentiality..............................................46
  16. Notices..................................................48
  17. Guarantor's Guarantee                                    49
  18. Miscellaneous............................................50

                                       2




Exhibits / Schedules
Exhibit 1.1          Current Status
Exhibit 1.5.1.3      Probem shareholders
Exhibit 1.5.3        List of Elephant Subsidiaries
Exhibit 1.5.4        Sankin shareholders
Exhibit 2.5          Brazilian Share Transfer Instruments
Exhibit 2.7.1        Consent of the partners' meeting of DD KG
Exhibit 2.7.2        Consent of board of directors of Sankin
Exhibit 2.7.3        Waiver  of  right of  first  refusal  by Mr.
                     Niemeyer
Exhibit 2.7.4        Consent of the  shareholder's  meeting of DD
                     Austria
Exhibit 2.7.5        Consent of the shareholders' meeting of DHZ
Exhibit 4.1.2        List of Consolidated Companies
Exhibit 4.1.4        Sample  calculation  of  Working  Capital as
                     per December 31, 2000
Exhibit 4.3          Allocation of Purchase Price
Exhibit 6.6.3
  (1)-(4)            Foreign Share transfer agreements
Exhibit 6.6.4        List of the board members
Exhibit 6.6.6        Name   and   trademark   agreement   between
                     Degussa and DD KG
Exhibit 7.1.16       List of Historic Consolidated Companies
Exhibit 8.6          Purchasers' management and advisors
Exhibit 10.2.2       Real Estate
Exhibit 13.3         Guarantees,   comfort   letters   and  other
                     securities
Exhibit 14.1         Permitted Activities
Exhibit 15.1         Guarantor's letter dated May 18, 2001

Schedule 7.1.5       List of Material Agreements
Schedule 7.1.6       Compliance with all Material Agreements
Schedule 7.1.7       Material Intellectual Property Rights
Schedule 7.1.8       Intellectual Property Proceedings
Schedule 7.1.9       Insurance
Schedule 7.1.10      Material Assets
Schedule 7.1.11      Permits
Schedule 7.1.12      Litigation
Schedule 7.1.14      List of certain collective bargaining
                     agreements
Schedule 7.1.15      Pensions
Schedule 7.1.17      Compliance with laws
Schedule 7.1.18      Material   adverse   changes,   conduct   of
                     business
Schedule 7.1.20.1    Properties
Schedule 7.1.20.2    Maintenance of Properties
Schedule 7.1.20.3    Not registered encumbrances
Schedule 7.1.20.6    Leases and subleases
                                       3




                           Definitions


Administrative Charges            as defined in Section 7.1.20-4
Affiliates                        as defined in Section 6.5.5
Austrian Financial Statements     as defined in Section 7.1.16
Austrian Share                    as defined in Section 1.5.6
Base Amount                       as defined in Section 4.1.1
Best Knowledge                    as defined in Section 7.3
Bios GmbH                         as defined in Section 1.3
Brazilian Local Management Shares as defined in Section 1.5.1.5
Brazilian Shares                  as defined in Section 1.5.1
Brazilian Subsidiaries            as defined in Section 1.5.1.4
Brazilian Share Transfer          as defined in Section 2.5
Instruments
Business                          as defined in Recital (E)
Business Days                     as defined in Section 18.8
Cash                              as defined in Section 4.1.3
Cash Management Agreements        as defined in Section 1.8
Closing                           as defined in Section 6.5
Closing Conditions                as defined in Section 6.2
Closing Date                      as defined in Section 6.1.3
Closing Events                    as defined in Section 6.6
Companies                         as defined in Section 1.6
Company                           as defined in Section 1.6
Competing Business                as defined in Section 14.2
Consolidated Companies            as defined in Section 4.1.2
Consolidated Financial Statements as defined in Section 7.1.16
DD Amazonia                       as defined in Section 1.5.1.1
DD Austria                        as defined in Section 1.5.6
DD GmbH                           as defined in Section 1.2
DD KG                             as defined in Section 1.3
DD Ltda.                          as defined in Section 1.5.1
Defradental                       as defined in Section 1.5.5
Degpar                            as defined in Section 1.5.1.2
Degussa                           shall mean Degussa AG
Degussa Guarantees                as defined in Section 13.3
Degussa-IP Rights                 as defined in Section 15.2
Degussa-Ney                       as defined in Section 1.5.2
De-minimis Claims                 as defined in Section 12.3
DHZ                               shall mean DH Zweite
                                  Vermogensverwaltungs-GmbH
Disclosure Schedules              as defined in Section 7.2
                                       4





Ducera GmbH                       as defined in Section 1.3
Dutch Business                    as defined in Section 7.1.5
Dutch Cash Management Agreement   as defined in Section 1.8
Dutch Shares                      as defined in Section 1.5.3
Effective Date                    as defined in Section 6.1.2
Effective Date Accounts           as defined in Section 5.1
Elephant                          as defined in Section 1.5.3
Elephant Subsidiaries             as defined in Section 1.5.3
Environmental Laws                as defined in Section 10.2.3
Environmental Liabilities         as defined in Section 10.2.1
Environmental Matters             as defined in Section 10.2.5
Environmental Threshold Amount    as defined in Section 12.3.2
EURIBOR                           as defined in Section 4.2
Existing Confidential Information as defined in Section 15.3
Existing Environmental Condition  as defined in Section 10.2.2
Expert                            as defined in Section 5.4
Facility Amount                   as defined in Section 4.2
Financial Debt                    as defined in Section 4.1.2
Financial Statements              as defined in Section 7.1.16
Foreign Companies                 as defined in Section 1.6
Foreign Shares                    as defined in Section 1.6
German Business                   as defined in Section 7.1.5
German Cash Management Agreement  as defined in Section 1.8
German Limited Partnership        as defined in Section 1.3
Interest
German Share                      as defined in Section 1.2
Guarantor                         shall mean Dentsply
                                  International Inc.
Hazardous Materials               as defined in Section 10.2.4
Historic Consolidated Companies   as defined in Section 7.1.16
HSR Filing                        as defined in Section 6.2.1
Interim Financing Facility        as defined in Section 3.3
Italian Third Party Shareholder   as defined in Section 1.5.5
Italian Shares                    as defined in Section 1.5.5
Japanese Business                 as defined in Section 7.1.5
Japanese Shareholder's Loan       as defined in Section 1.7
Japanese Shares                   as defined in Section 1.5.4
Material Adverse Effect           as defined in Section 7.1.5
Material Agreements               as defined in Section 7.1.5
Material Assets                   as defined in Section 7.1.10
Material Intellectual Property    as defined in Section 7.1.7
Rights
Mr. Niemeyer                      as defined in Section 1.5.1
Object of Sale                    as defined in Section 4.1

                                       5





Objections                        as defined in Section 5.4
Partner's Accounts                as defined in Section 2.2
Party / Parties                   shall   mean   individually   or
                                  collectively    Degussa,    DHZ,
                                  Purchasers and the Guarantor
Permitted Activities              as defined in Section 14.1
Permits                           as defined in Section 7.1.11
Preliminary Purchase Price        as defined in Section 4.2
Probem                            as defined in Section 1.5.1.3
Properties                        as defined in Section 7.1.20
Proprietary Information           as defined in Section 15.3
Purchase Price                    as defined in Section 4.1
Purchase Price Adjustment         as defined in Section 4.4
Purchaser 1                       shall mean  Dentsply  Hanau GmbH
                                  & Co. KG
Purchaser 2                       shall  mean  Dentsply   Research
                                  and Development Corporation
Purchaser 3                       shall mean Dentsply EU S.a.r.l.
Purchaser Claim                   as defined in Section 9.2
Purchasers                        shall     mean      collectively
                                  Dentsply  Hanau  GmbH  & Co  KG,
                                  Dentsply       Research      and
                                  Development    Corporation   and
                                  Dentsply EU S.a.r.l.
Purchasers' Auditor               as defined in Section 5.2
Real Estate                       as defined in Section 10.2.2
Revised Effective Date Accounts   as defined in Section 5.3
Sankin                            as defined in Section 1.5.4
Scheduled Closing Date            as defined in Section 6.5
Sellers                           shall mean collectively Degussa
                                  AG and DH Zweite
                                  Vermogensverwaltungs-GmbH
Sellers' Auditor                  as defined in Section 5.1
Signing Date                      as defined in Section 6.1.1
Taxes                             as defined in Section 11.1
Tax Threshold Amount              as defined in Section 12.3.3
Threshold Amount                  as defined in Section 12.3.1
Third Party Claim                 as defined in Section 9.5
US Business                       as defined in Section 7.1.5
US Cash Management Agreement      as defined in Section 1.8
US GAAP                           as defined in Section 5.1
US GAAS                           as defined in Section 13.7

                                       6





US Shares                         as defined in Section 1.5.2
Working Capital                   as defined in Section 4.1.4

                                       7





RECITALS

(A)   WHEREAS,  Degussa is a stock  corporation  under German law
      (Aktiengesellschaft),  having its  domicile in  Dusseldorf,
      Germany,  and being registered with the commercial register
      maintained  at the lower court of  Dusseldorf  under docket
      no. HRB 39635.

(B)   WHEREAS,  DHZ is a limited  liability  company under German
      law  (Gesellschaft  mit beschrankter  Haftung),  having its
      domicile in Hanau,  Germany,  and being registered with the
      commercial  register maintained at the lower court of Hanau
      under docket no. HRB 6861.

(C)   WHEREAS,  Purchaser  1 is  a  German  Limited  Partnership,
      having its  domicle  at Hanau  Wolfgang;  Purchaser  2 is a
      stock  corporation  under  Delaware,  USA law,  having  its
      domicile  at  Milford,  Delaware,  USA;  Purchaser  3  is a
      Luxembourg Limited Liability  Company,  having its domicile
      at Luxembourg, Grand-Duchy of Luxembourg.

(D)   WHEREAS,  Guarantor is a stock  corporation under Delaware,
      USA law, having its domicile at York, Pennsylvania, USA.

(E)   WHEREAS,   Degussa  is,  amongst  others,  engaged  in  the
      development,  production,  marketing  and  distribution  of
      products  and  systems,   equipment  and   consumables  for
      conservative,  restorative and orthodontic dental treatment
      (herein   collectively   "Business")  through  (i)  Degussa
      Dental  GmbH & Co. KG and its  German  subsidiaries  on the
      one  hand  and  through  (ii)  the   foreign,   direct  and
      indirect, subsidiaries of DHZ on the other hand.

(F)   WHEREAS,  Degussa, after a strategic review of its business
      portfolio,  has  decided  to  concentrate  on  its  special
      chemicals business and to dispose of the Business.

(G)   WHEREAS,  Sellers  intend to  dispose  of the  Business  by
      selling and  transferring  the  Business to the  Purchasers
      subject to the terms and  conditions of this  Agreement and
      Purchasers  wish to acquire  the  Business  subject to such
      terms and conditions.


NOW, THEREFORE, the Parties agree as follows:

                                       8





A.    CURRENT STATUS

1.    Current Status

1.1   The present  structure of the directly and indirectly  held
      subsidiaries   of  Degussa   engaged  in  the  Business  is
      attached as Exhibit 1.1.

1.2   Degussa  Dental  Verwaltungs-GmbH  is a  limited  liability
      company  (Gesellschaft mit beschrankter Haftung) having its
      domicile  in Hanau,  Germany,  and is  registered  with the
      commercial  register maintained at the lower court of Hanau
      under  docket no. HRB 6844  (herein "DD GmbH").  Degussa is
      the sole  shareholder  of DD GmbH  holding  the only  share
      (Geschaftsanteil)  issued by DD GmbH in the nominal  amount
      of Euro 25,000.00 (herein "German Share")  representing all
      of the stated nominal capital  (Stammkapital) of DD GmbH in
      the nominal amount of Euro 25,000.00.

1.3   Degussa  Dental  GmbH  & Co.  KG is a  limited  partnership
      (Kommanditgesellschaft)   having  its  domicile  in  Hanau,
      Germany,  and is registered  with the  commercial  register
      maintained  at the lower  court of Hanau  under  docket no.
      HRA 5530  (herein  "DD KG").  Degussa  is the sole  limited
      partner  (Kommanditist)  of DD  KG,  holding  a  registered
      limited partnership  interest  (Kommanditeinlage as well as
      Hafteinlage)  in  DD KG  in  the  nominal  amount  of  Euro
      25,565,000.00    (herein   "German   Limited    Partnership
      Interest").  The sole general partner  (Komplementar) in DD
      KG is DD  GmbH  which  does  not  hold a  capital  interest
      (Kapitalanteil)  in the fixed capital  (Festkapital)  of DD
      KG. DD KG in turn holds all shares of Bios Dental  GmbH,  a
      limited  liability  company  (Gesellschaft mit beschrankter
      Haftung) having its domicile in Bohmte,  Germany, and being
      registered  in the  commercial  register  maintained at the
      lower court of Osnabruck  under docket no. HRB 0054 (herein
      "Bios GmbH") and all shares of Ducera Dental Verw.  GmbH, a
      limited  liability  company  (same  as  above)  having  its
      domicile in Rosbach,  Germany and being  registered  in the
      commercial  register  maintained  at  the  lower  court  of
      Friedberg under docket no. HRB 746 (herein "Ducera GmbH").

1.4   By notarial deed of the notary public Dr.  Joachim  Treeck,
      Frankfurt  am Main (no.  106 of the roll of deeds for 2000)
      dated  June  29,  2000,  Degussa   contributed  its  German
      activities relating to the Business to DD KG.

1.5   DHZ holds direct  participations  in the foreign  companies
      Degussa  Dental Ltda.,  Degussa-Ney  Dental Inc.,  Elephant
      Dental B.V.,  Sankin  Kogyo K.K.,  Defradental  S.p.A.  and
      Degussa Dental Austria GmbH as follows:

                                       9




      1.5.1Degussa  Dental Ltda. is a limited  liability  company
           formed and validly  existing  under the laws of Brazil
           having its  domicile  in Sao  Paulo,  Brazil and it is
           registered with the Corporate  Taxpayer's  Registry of
           the Brazilian  Ministry of Finance (CNPJ/MF) under no.
           03.757.350/0001-95  (herein  "DD  Ltda.").  DHZ is the
           majority  shareholder of DD Ltda.  holding  14,821,009
           shares issued by DD Ltda. in the nominal  amount of R$
           1.00 each (herein  collectively  "Brazilian  Shares"),
           representing   about  99.99%  of  the  nominal  stated
           capital  of  DD  Ltda.   in  the  nominal   amount  of
           R$ 14,821,010.00.  The remaining  share in the nominal
           amount  of R$  1.00 is  held  by Mr.  Ernesto  Helmuth
           Niemeyer Filho,  managing director of DD Ltda. (herein
           "Mr. Niemeyer").

            1.5.1.1   DD Ltda. holds 9,998 shares in the nominal amount of R$
                      1.00 each, being all shares except for two (2) shares, of
                      Degussa Dental da Amazonia Ltda., a limited liability
                      company formed and validly existing under the laws of
                      Brazil having its domicile in Manaus, State of Amazonas,
                      Brazil, and being registered with the Corporate Taxpayer's
                      Registry of the Brazilian Ministry of Finance (CNPJ/MF)
                      under no. 04.032.335/0001-42 (herein "DD Amazonia"). Each
                      Mr. Niemeyer and Mr. Joao Aparecido de Beni, members of
                      the management of DD Amazonia, hold one (1) share of DD
                      Amazonia in the nominal amount of R$ 1.00.

            1.5.1.2   DD Ltda. holds all shares, except for one (1) share, of
                      Degpar - Participacoes e Empreendimentos S.A., a joint
                      stock corporation formed and validly existing under the
                      laws of Brazil having its domicile in Sao Paulo, Brazil,
                      and being registered with the Corporate Taxpayer's
                      Registry of the Brazilian Ministry of Finance (CNPJ/MF)
                      under no. 02.074.038/0001-34 (herein "Degpar"). The one
                      (1) share in Degpar not held by DD Ltda. is held by Mr.
                      Niemeyer.

            1.5.1.3   Degpar holds 60% of the nominal stated capital, of Probem
                      Laboratorio de Prudutos Farmaceuticos e Odontologicos
                      S.A., a joint stock corporation formed and validly
                      existing under the laws of Brazil having its domicile in
                      Catanduva, Brazil, and being registered with the Corporate
                      Taxpayer's Registry of the Brazilian Ministry of Finance
                      (CNPJ/MF) under no. 45.841.137/0001-07 (herein "Probem").
                      The remaining shares of Probem are held by the
                      shareholders identified on Exhibit 1.5.1.3. who are not
                      affiliated with Sellers.

                                       10




            1.5.1.4   DD Amazonia and Probem are herein collectively referred to
                      as "Brazilian Subsidiaries". For the avoidance of doubt,
                      Degpar shall not be referred to as Brazilian Subsidiary.

            1.5.1.5   The shares held by Mr. Niemeyer of DD Ltda., DD Amazonia
                      and Degpar and the share held by Mr. Beni of DD Amazonia
                      are herein collectively referred to as "Brazilian Local
                      Management Shares".

      1.5.2Degussa-Ney  Dental Inc., is a corporation  formed and
           validly existing under the laws of Delaware,  USA, and
           having  its  domicile  at 65 West  Dudley  Town  Road,
           Bloomfield,     CT     06002-1316,     USA     (herein
           "Degussa-Ney").   DHZ  is  the  sole   shareholder  of
           Degussa-Ney  holding 100 no par value shares of common
           stock issued by Degussa-Ney  (herein  collectively "US
           Shares").

      1.5.3Elephant Dental B.V., is a limited  liability  company
           formed and  validly  existing  under  Dutch law having
           its domicile in Hoorn, The Netherlands,  with business
           address at 1628 PM Hoorn,  Venlengde  Lageweg  10, The
           Netherlands,  registered  with the Chamber of Commerce
           for  West-Friesland  en  Waterland,  The  Netherlands,
           under no.  36006373  (herein  "Elephant").  DHZ is the
           sole  shareholder  of Elephant  holding  30,000 shares
           issued  by  Elephant  in  the  nominal  amount  of NLG
           100.00  each  (herein  collectively  "Dutch  Shares"),
           representing  the entire stated capital of Elephant in
           the  nominal  amount  of  NLG  3,000,000.00.  Elephant
           holds  100%  of  the  stated  share   capital  of  the
           companies    listed   in   Exhibit    1.5.3    (herein
           collectively "Elephant Subsidiaries").

      1.5.4     Sankin  Kogyo  K.K.  is  a  joint  stock  company
           formed and validly  existing under Japanese law having
           its  domicile in Ohtawara  City,  Tochigi  Prefecture,
           with  business  address  at  14-9,   Yushima  3-chome,
           Bunkyo-ku,  Tokyo 113-0034,  Japan (herein  "Sankin").
           DHZ holds  1,261,102  shares of common stock issued by
           Sankin  in  the  nominal  amount  of JPY  500.00  each
           (herein collectively "Japanese Shares"),  representing
           94.4% of the  capital  of Sankin in the  amount of JPY
           680,809,000.00.  The  remaining  shares  are  held  by
           various  shareholders  not affiliated  with Degussa as
           identified in Exhibit 1.5.4.

      1.5.5Defradental  S.p.A. is a stock corporation and validly
           existing  under  Italian  law having its  domicile  in
           Verona,  Italy (herein  "Defradental"),  with business
           address at Via Catania,  3, Verona,  Italy,  and it is
           registered  in  C.C.I.A.A.  di Verona al n. 256943 and
           in Registro delle Imprese di Verona

                                       11




           at no.  208412/96.  DHZ holds 1,065,539  shares issued
           by  Defradental  in the  nominal  amount  of Euro 1.00
           each (herein  "Italian  Shares"),  representing 45% of
           the  nominal  stated  capital  of  Defradental  in the
           nominal amount of Euro 2,367,420.00.  To the knowledge
           of Sellers,  the remaining shares are held by Fraccari
           S.p.A.   with   domicile  in  Verona,   Italy  (herein
           "Italian Third Party Shareholder").

      1.5.6Degussa  Dental  Austria  GmbH is a limited  liability
           company formed and validly  existing under the laws of
           Austria having its domicile in Vienna,  Austria,  with
           business  address  at  Liesinger-Flur-Gasse  2C,  1235
           Vienna,   Austria,   and  being  registered  with  the
           commercial  register  in  Vienna,  Austria,  under  FN
           207061 b (herein  "DD  Austria").  DHZ holds one share
           issued by DD  Austria  in the  nominal  amount of Euro
           500,000.00  (herein  "Austrian  Share"),  representing
           100% of the  nominal  stated  capital of DD Austria in
           the nominal amount of Euro 500,000.00.

1.6   DD Ltda., Degussa-Ney,  Elephant, Sankin and DD Austria are
      herein   collectively   referred   to   as   the   "Foreign
      Companies".  For the avoidance of doubt,  Defradental shall
      not be  referred  to as Foreign  Company.  DD GmbH,  DD KG,
      Bios  GmbH,  Ducera  GmbH,  the  Foreign   Companies,   the
      Brazilian  Subsidiaries  and the Elephant  Subsidiaries are
      herein  collectively  referred  to as the  "Companies"  and
      individually  as "Company".  The Brazilian  Shares,  the US
      Shares,   the  Dutch  Shares,   the  Japanese  Shares,  the
      Austrian   Share  and  the   Italian   Shares   are  herein
      collectively referred to as the "Foreign Shares".

1.7   A  Shareholder's  loan has been granted and drawn as of the
      Signing  Date (as  defined in Section  6.1.1  below) in the
      amount JPY  250,000,000.00 to Sankin by Degussa pursuant to
      a certain credit  agreement  dated December 6, 2000 (herein
      "Japanese  Shareholder's Loan"). There exist no shareholder
      loans other than those  identified  in this  Section 1.7 on
      the Effective Date and the Closing Date.

1.8   Degussa  has  entered  into  a  cash  management  agreement
      relating  to the cash  pooling of funds of DD KG, Bios GmbH
      and other  German  affiliates  of Degussa  (herein  "German
      Cash  Management  Agreement").   Furthermore,  Degussa  has
      entered into a cash  management  agreement  relating to the
      cash   pooling  of  funds  of  Elephant   and  other  Dutch
      affiliates  of  Degussa   (herein  "Dutch  Cash  Management
      Agreement").  Finally,  Degussa-Ney has entered into a cash
      management  agreement  with  Degussa   Corporation,   a  US
      subsidiary   of  Degussa   (herein   "US  Cash   Management
      Agreement").  The German  Cash  Management  Agreement,  the
      Dutch Cash Management  Agreement and the US Cash Management
      Agreement  shall herein  collectively  referred to as "Cash
      Management  Agreements".  Degussa shall terminate and, with
      respect to the US Cash Management Agreement,

                                       12




      procure  termination,  of the  Cash  Management  Agreements
      with  respect  to  the   Companies   being  party  to  such
      agreements  in  writing  with  economic  effect  as of  the
      Effective  Date.  Upon  termination of the Cash  Management
      Agreements any outstanding  balances  thereunder owing from
      or owing to the  Companies  shall be settled by the parties
      to the  Cash  Management  Agreements  on,  or  prior to the
      Closing Date.


B.    SALE, PURCHASE AND ASSIGNMENT, PURCHASE PRICE


2.    Sale,   Purchase  and  Assignment  of  the  German  Limited
      Partnership Interest,  the Foreign Shares and the Brazilian
      Local Management Shares

2.1   Degussa   hereby    agrees,    with    commercial    effect
      (wirtschaftlicher  Wirkung)  as of the  Effective  Date (as
      defined  in  Section  6.1.2  below) to cause DD GmbH on the
      Scheduled  Closing  Date to withdraw and  discontinue  as a
      partner in DD KG.

2.2   Degussa  hereby  sells  with  commercial  effect  as of the
      Effective  Date and hereby  assigns  with  effect as of the
      Closing  Date  (as  defined  in  Section  6.1.3  below)  to
      Purchaser  1 (i) the German  Limited  Partnership  Interest
      with all rights and  obligations  pertaining  thereto,  and
      (ii)     all     partner's     accounts     of     DD    KG
      (Gesellschafterkonten)   (herein  collectively   "Partner's
      Accounts"),  such Partner<180>s Accounts being comprised of (a)
      the  capital  account  (Festkapitalkonto,  Kapitalkonto I),
      (b)       the       partner's        clearing       account
      (Gesellschafter-Verrechnungskonto,  Kapitalkonto  II),  (c)
      the loss carry forward account (Verlustvortragskonto),  and
      (d)  the  reserve  account  (Rucklagenkonto).  Purchaser  1
      hereby   purchases   from   Degussa   the  German   Limited
      Partnership  Interest and the Partner's Accounts and hereby
      accepts the  assignment of the German  Limited  Partnership
      Interest and the Partner's  Accounts in accordance with the
      foregoing sentence.

2.3   DHZ  hereby  sells  with   commercial   effect  as  of  the
      Effective  Date to Purchaser 2 and  undertakes to assign on
      the  Scheduled  Closing  Date to Purchaser 2 the US Shares,
      Brazilian  Shares and the  Japanese  Shares with all rights
      and obligations  including any dividend  rights  pertaining
      thereto  with  effect as of the Closing  Date.  Purchaser 2
      hereby  purchases from DHZ the US Shares,  Brazilian Shares
      and the  Japanese  Shares and hereby  undertakes  to accept
      the  assignment on the  Scheduled  Closing Date as provided
      for  under  Section  6.6  below  in  accordance   with  the
      foregoing sentence.

2.4   DHZ  hereby  sells  with   commercial   effect  as  of  the
      Effective  Date to Purchaser 3 and  undertakes to assign on
      the Scheduled Closing Date to Purchaser 3 the Dutch

                                     13




      Shares  and  the   Italian   Shares  with  all  rights  and
      obligations   including  any  dividend  rights   pertaining
      thereto  with  effect as of the Closing  Date.  Purchaser 3
      hereby  purchases  from DHZ the Dutch  Shares  and  Italian
      Shares and hereby  undertakes  to accept the  assignment on
      the  Scheduled  Closing Date as provided for under  Section
      6.6 below in accordance with the foregoing sentence.

2.5   Seller shall  procure  that Mr.  Niemeyer and Mr. Beni each
      sell with  commercial  effect as of the Effective  Date and
      assign on the Scheduled  Closing Date the  Brazilian  Local
      Management  Shares to Purchaser 2, or any of its Affiliates
      designated  by Purchaser 2 prior to the  Scheduled  Closing
      Date, by executing the  instruments  set out in the form as
      set forth in Exhibit 2.5 in the Portugese  language (herein
      "Brazilian Share Transfer Instruments").

2.6   DHZ  hereby  sells  with   commercial   effect  as  of  the
      Effective  Date and  hereby  assigns  subject to all of the
      Closing  Conditions  (as  defined  in  Section  6.2  below)
      having been  fulfilled  and all of the  Closing  Events (as
      defined in Section 6.6 below)  having taken place or having
      been duly  waived  with  effect as of the  Closing  Date to
      Purchaser  3  the  Austrian   Share.   Purchaser  3  hereby
      purchases and accepts the  assignment of the Austrian Share
      in accordance with the forgoing sentence.

2.7   The  following  consents  all  of  which  comply  with  and
      satisfy all local legal and contractual  requirements  have
      been given on, or prior to, the  Closing  Date to the sale,
      assignment and transfer of the German  Limited  Partnership
      Interest and the Foreign Shares:

      2.7.1  Consent  of  the  partners'  meeting  of  DD  KG  as
             attached in Exhibit 2.7.1;

      2.7.2  Consent  of the  board of  directors  of  Sankin  as
             attached in Exhibit 2.7.2;

      2.7.3  Waiver  of  Mr.  Niemeyer  of  his  right  of  first
             refusal  with  respect to the  transfer of shares in
             DD Ltda. as attached in Exhibit 2.7.3;

      2.7.4  Consent of the  shareholder's  meeting of DD Austria
             as attached in Exhibit 2.7.4;

      2.7.5  Consent  of  the  shareholder's  meeting  of  DHZ as
             attached in Exhibit 2.7.5.


3.    Sale,    Purchase   and    Assignment   of   the   Japanese
      Shareholder's Loan; Interim Financing Facility

                                       14





3.1   Degussa  hereby  sells  with  commercial  effect  as of the
      Effective Date and hereby  assigns,  subject to Section 3.2
      below,  with effect as of the Closing  Date to  Purchaser 2
      the  Japanese   Shareholder's  Loan.   Purchaser  2  hereby
      purchases,  in partial consideration of the Purchase Price,
      from  Degussa the Japanese  Shareholder's  Loan and accepts
      the assignment in accordance with the foregoing sentence.

3.2   The  assignment  of  the  Japanese  Shareholder's  Loan  is
      subject to all of the  Closing  Conditions  (as  defined in
      Section  6.2 below)  having been  fulfilled  and all of the
      Closing  Events (as  defined in Section  6.6 below)  having
      taken place or having been duly waived.

3.3   To ensure  financing of the Companies after  termination of
      the Cash  Management  Agreements  as set out in Section 1.8
      above,  Degussa  shall  provide  to the  Companies  interim
      financing  facilities  for the period between the Effective
      Date and the Closing  Date in amounts  reasonably  required
      for funding the Business in  accordance  with past practice
      and projected  financing  needs of the Business  during the
      aforementioned    period   (herein    "Interim    Financing
      Facility").   The  Interim  Financing   Facility  shall  be
      redeemed at the Closing  Date in  accordance  with  Section
      4.2 below.


4.    Purchase Price

4.1   The purchase price for (i) the German  Limited  Partnership
      Interest,  (ii) the Partner's  Accounts,  (iii) the Foreign
      Shares,  (iv) the Brazilian Local  Management  Shares,  and
      (v) the Japanese  Shareholder's  Loan (herein  collectively
      "Object of Sale") shall be an amount calculated as follows:

      4.1.1  A fixed amount of Euro  576,000,000 (in words:  Euro
             five  hundred  seventy six  million)  (herein  "Base
             Amount");

      minus

      4.1.2  the  consolidated  nominal  amount  of any  interest
             bearing  debt   obligations   of  the   Consolidated
             Companies    listed   in   Exhibit   4.1.2   (herein
             "Consolidated  Companies")  to banks,  financial  or
             other  similar  institutions,  including any amounts
             owed  by  the   Consolidated   Companies  under  the
             respective  Cash  Management   Agreements  prior  to
             their termination  (herein "Financial  Debt"),  each
             existing as per the  Effective  Date,  excluding for
             the    avoidance   of   doubt   (a)   the   Japanese
             Shareholder's   Loan,   (b)  any  unfunded   pension
             liabilities  of the  Consolidated  Companies and (c)
             the Fa

                                       15




             cility Amount (as defined in Section 4.2 below);

      plus

      4.1.3  the   consolidated   amount   of   cash   and   cash
             equivalents  (within  the meaning of Section 266 (2)
             (B) (III) (3) and (IV) German  Commercial Code (HGB)
             of the Consolidated  Companies including any amounts
             to be paid to the  Consolidated  Companies under the
             respective  Cash  Management   Agreements  prior  to
             their termination (herein "Cash"),  each existing as
             per the Effective Date;

      plus

      4.1.4  the  consolidated  amount,  if  any,  by  which  the
             balance   of  (i)  the   amount  of  the   inventory
             (excluding  the palladium  stock) within the meaning
             of Section  266 (2) (B) (I) German  Commercial  Code
             (HGB) (Vorrate) plus the trade accounts  receivables
             within the  meaning of Section  266 (2) (B) (II) (1)
             German   Commercial  Code  (HGB)   (Forderungen  aus
             Lieferungen und Leistungen) including  inter-company
             trade accounts  receivables,  and (ii) the amount of
             the trade  accounts  payable  within the  meaning of
             Section 266 (3) (C) (IV) (4) German  Commercial Code
             (HGB)   (Verbindlichkeiten   aus   Lieferungen   und
             Leistungen)  including  inter-company trade accounts
             payable,  for the  Historic  Consolidated  Companies
             including  DD  Austria  (herein  "Working  Capital")
             each existing as per the Effective  Date,  exceeds *
             * * * * * * * * * * * *;  a  sample  calculation  of
             the Working  Capital as per  December 31, 2000 being
             attached  hereto  as  Exhibit  4.1.4  and  it  being
             understood  that for such  purposes DD Austria  was,
             or shall be,  respectively  included on the basis of
             the Austrian  Financial  Statements  (excluding  the
             palladium stock);

      minus

      4.1.5  the amount,  if any,  by which the  Working  Capital
             existing as per the Effective  Date falls short of *
             * * * * * * * * * * * *;

      minus

      4.1.6  the  amount of * * * * * * * * * * * * * only in the
             event that the  waiver of the  Italian  Third  Party
             Shareholder  of its  right  of  first  refusal  with
             respect   to  the   transfer   of  the   shares   in
             Defradental  shall not have been  obtained  or shall
             not be  deemed to have  been  obtained  prior to the
             date on which the  Effective  Date  Accounts  become
             binding on the Parties in accordance

                                       16




             with Section 5 below;

      plus interest at the rate of 6.5% p.a.  since the Effective
      Date (herein "Purchase Price").

4.2   On the  Scheduled  Closing  Date,  Purchasers  shall pay to
      Sellers (i) an amount of Euro  548,000,000 (in words:  Euro
      five  hundred  forty eight  million)  (herein  "Preliminary
      Purchase   Price")   and  (ii)  for  the   account  of  the
      Companies,  the  aggregate  amount  owed to  Degussa by the
      Companies under the Interim  Financing  Facility  including
      interest  thereon at the rate of 6.5% p.a. accrued from the
      calendar  day  subsequent  to  Effective  Date  (inclusive)
      until  the  Closing  Date  (exclusive)   (herein  "Facility
      Amount").  "EURIBOR" for purposes of this  Agreement  shall
      mean the  interest  rate for Euro  deposits  with  interest
      periods  of three  (3)  months,  as  quoted  on the  Bridge
      Telerate Screen 248 at 11 a.m. C.E.T.  two (2) banking days
      in  Frankfurt  am  Main  prior  to  Effective   Date.   The
      Preliminary  Purchase  Price and the Facility  Amount shall
      be  paid  by  Purchasers  free  of  costs  and  charges  in
      immediately  available  funds  by wire  transfer  into  the
      account of Sellers set forth in Section 4.6 below.

4.3   The Parties agree that the Preliminary  Purchase Price, and
      any subsequent  Purchase Price  Adjustment (as provided for
      in Section 4.4 below)  shall be  allocated to the Object of
      Sale as set out in Exhibit 4.3.

4.4   If on the basis of the Effective Date Accounts  prepared in
      accordance  with the  provisions  set forth in Section  5.1
      below, the Purchase Price exceeds the Preliminary  Purchase
      Price,  Purchasers  shall pay to Sellers an amount equal to
      the amount by which the  Purchase  Price is higher than the
      Preliminary  Purchase  Price  and,  if, on the basis of the
      Effective Date  Accounts,  the  Preliminary  Purchase Price
      exceeds  the   Purchase   Price,   Sellers   shall  pay  to
      Purchasers  an  amount  equal to the  amount  by which  the
      Preliminary  Purchase  Price is  higher  than the  Purchase
      Price.  Any such amount to be paid by either  Purchasers or
      Sellers (herein "Purchase Price  Adjustment") shall be paid
      as follows:

      4.4.1  Any Purchase  Price  Adjustment  owed by  Purchasers
             shall  be  paid by  Purchasers  free  of  costs  and
             charges  in  immediately  available  funds  by  wire
             transfer  ten (10) banking days in Frankfurt am Main
             after the Effective  Date Accounts have become final
             and  binding  upon the  Parties in  accordance  with
             Section 5 below to the  account of Degussa set forth
             in Section 4.6 below.

      4.4.2  Any Purchase Price  Adjustment owed by Sellers shall
             be paid by  Sellers  free of costs  and  charges  in
             immediately available funds by wire transfer

                                       17




             ten (10)  banking  days in  Frankfurt  am Main after
             the  Effective  Date  Accounts have become final and
             binding upon the Parties in accordance  with Section
             5 below to the  account of  Purchaser 1 set forth in
             Section 4.7 below.

4.5   Except as provided otherwise in this Agreement,  Purchasers
      and Sellers owe the other  party  interest  (Verzugszinsen)
      on any  amounts  becoming  due and  payable  to  Sellers or
      Purchasers,  as the case may be,  under this  Agreement  as
      from the respective  payment dates,  to, but not including,
      the day of  payment  at the rate of 700 basis  points  over
      EURIBOR.

4.6   All  payments  owed by  Purchasers  to  Sellers  under this
      Agreement  shall be paid by  Purchasers by wire transfer to
      the bank  account of Degussa  kept with  Degussa Bank GmbH,
      Frankfurt  am Main,  sort code  (Bankleitzahl)  500 107 00,
      account number 390053, SWIFT: DEGUDEFF.

4.7   All  payments  owed by  Sellers  to  Purchasers  under this
      Agreement  shall be paid by  Sellers  by wire  transfer  to
      Purchaser  1's bank  account  the details of which shall be
      communicated   to  Sellers  by  Purchasers,   if  and  when
      requested by Sellers.


C.    EFFECTIVE  DATE  ACCOUNTS,  SIGNING DATE,  EFFECTIVE  DATE,
      CLOSING DATE AND CLOSING

5.    Effective Date Accounts

5.1   The Financial Debt, the Cash and the Working Capital,  each
      existing as of the Effective  Date, as well as any Purchase
      Price Adjustment resulting  therefrom,  shall be determined
      on the basis of pro-forma  consolidated  accounts as of the
      Effective Date for the  Consolidated  Companies which shall
      be  prepared  by DD KG in  co-operation  with  Degussa  and
      reviewed  by  KPMG  Deutsche  Treuhand   Aktiengesellschaft
      Wirtschaftsprufungsgesellschaft,  Frankfurt am Main (herein
      "Sellers'   Auditor")  in  accordance   with  US  generally
      accepted   principles  of  accounting  and  preparation  of
      annual  accounts  (herein "US GAAP"),  subject to utilizing
      and continuing the same  capitalization,  election  rights,
      valuation   and   consolidation   principles   as  used  in
      preparation  of the  Financial  Statements  (as  defined in
      Section 7.1.16 below) on the basis of Degussa's  accounting
      and consolidation  standards,  a complete copy of which was
      delivered to  Purchasers  prior to the Signing Date (herein
      "Effective Date Accounts").

5.2   Sellers shall until the Closing Date and  Purchasers  shall
      after the Closing Date  instruct the  management of each of
      the Consolidated Companies to effectively assist

                                       18




      Sellers'  Auditor in reviewing the Effective Date Accounts,
      in   particular,   by   providing   all   information   and
      documentation  requested  by Sellers.  The  Effective  Date
      Accounts  prepared by DD KG in  co-operation  with  Degussa
      and  reviewed by Sellers'  Auditor  shall be  delivered  to
      PriceWaterhouseCoopers,  Philadelphia  (herein "Purchasers'
      Auditor")   no  later  than  ninety  (90)  days  after  the
      Effective  Date.  Purchasers'  Auditor  shall  receive  all
      necessary  assistance and shall be given reasonable  access
      to the  management of the  Consolidated  Companies,  and to
      all relevant  documentation,  necessary  for  reviewing the
      Effective  Date  Accounts,  including the working papers of
      Sellers' Auditor,  subject,  however to Sellers'  Auditor's
      approval  which  Sellers  shall use best  efforts to obtain
      prior to the Closing Date.

5.3   The Effective  Date Accounts  submitted by Sellers shall be
      final and binding upon the Parties,  and the calculation of
      the Financial  Debt, the Cash and the Working Capital shall
      be based on the Effective Date Accounts,  unless Purchasers
      provide  Sellers  within  forty  five (45)  days  after the
      receipt  of the  Effective  Date  Accounts  with a  written
      report asserting that the Effective Date Accounts  received
      from Sellers do not meet the  provisions of this  Agreement
      by way of  stating  specific  objections  to  that  effect.
      Such written  report  shall be submitted to Sellers  within
      the  forty-five  (45) days' period  mentioned  before which
      shall take into account the changes  that are  necessary in
      Purchasers'  Auditor's view (herein "Revised Effective Date
      Accounts").  If no objections  are raised by Sellers within
      four  (4)  weeks  following  the  delivery  of the  Revised
      Effective  Date Accounts by Purchasers'  Auditor,  then the
      Revised  Effective Date Accounts shall be final and binding
      on the Parties.

5.4   If Sellers timely raise  objections  (herein  "Objections")
      to the  Revised  Effective  Date  Accounts  and Sellers and
      Purchasers   cannot   agree  on  changes  to  the   Revised
      Effective  Date  Accounts  within four (4) weeks  following
      the  delivery  of  the  Objections   each  of  Sellers  and
      Purchasers  shall be  entitled  to refer such  dispute  for
      decision to an  independent  international  leading firm of
      public  accountants  (big five) other than Sellers' Auditor
      and  Purchasers'  Auditor  (herein  "Expert")  which  shall
      determine  the correct  amount of the Financial  Debt,  the
      Cash and the  Working  Capital,  if and to the extent  such
      positions are in dispute  between  Sellers and  Purchasers.
      If the  Parties  cannot  agree  within two (2) weeks on who
      shall  be  the   expert,   the   Institute   of   Chartered
      Accountants in Germany (Institut der  Wirtschaftsprufer  in
      Deutschland  e.V.),  Dusseldorf,  shall appoint the Expert.
      The   Expert    shall    decide   as   expert    arbitrator
      (Schiedsgutachter)  on the issues in dispute in  accordance
      with the  principles  set out in  Section  5.1  above.  The
      Expert   shall  give   Sellers  and   Purchasers   adequate
      opportunity  to present  their  views in  writing  and at a
      hearing or hearings  to be held in the  presence of Sellers
      and Purchasers and their respective  advisors.  The Parties
      shall  instruct  the Expert to deliver its written  opinion
      to them no  later  than  four  weeks  after  the  remaining
      differences are

                                       19




      referred  to it. The  Expert  shall  give  reasons  for its
      decision  in  writing  on all  issues  which are in dispute
      between  Sellers  and  Purchasers.  The costs and  expenses
      incurred  by the Expert  shall be borne  equally by Sellers
      on the one hand  and  Purchasers  on the  other  hand.  The
      Effective  Date  Accounts as determined by the Expert shall
      be final and binding on the Parties  subject to Section 319
      German  Civil Code (BGB).  Each Party shall give the Expert
      full access to information required for its decision.


6.    Signing Date, Effective Date, Closing Date and Closing

6.1   Signing  Date,  Effective  Date and Closing Date shall each
      have the following meaning in this Agreement:

      6.1.1  "Signing  Date"  shall  be  the  day on  which  this
             Agreement  has been  duly  executed  before a notary
             public.

      6.1.2  "Effective  Date"  shall be the first  calendar  day
             0:00  hours of the  month in which  the  Closing  of
             this  transaction as contemplated  under Section 6.5
             shall occur.

      6.1.3  "Closing  Date"  shall  be  the  day  on  which  the
             Closing Events shall take place.

6.2   This  Agreement  shall  be  closed  (erfullt)  pursuant  to
      Section 6.5  below only,  if the following  conditions  are
      fulfilled (herein collectively "Closing Conditions"):

      6.2.1  The  merger  control  approvals  under  (i) ss.ss. 35 et
             seq. German  Antitrust Act (GWB), and (ii) the Dutch
             1975 Merger Code granted by the Dutch  Committee for
             Merger Affaires,  and (iii) the Austrian Cartel Act,
             (iv) the  Hart-Scott-Rodino  Antitrust  Improvements
             Act of 1976, and (v) Title VII,  Chapter I, Articles
             54-56  of  Law  No.  8884  Brazilian  Antitrust  Act
             (unless  Purchasers  determine  that  the  Brazilian
             Antitrust  Act is  not  applicable  to the  Closing)
             have  been  obtained  or if for  other  reasons  the
             transactions  provided for in this  Agreement may be
             consummated  under  the  above  merger  law  regimes
             (e.g.  lapse  of  waiting  periods)  or  Closing  is
             permitted  before  clearance  is received or waiting
             periods are lapsed.

6.2.2 No  enforceable  judgment,  injunction,  order or decree by
             any court or  governmental  authority  in Germany or
             the  USA  has  prohibited  the  consummation  of the
             transactions  contemplated  in this  Agreement as of
             the day the  condition  pursuant to Section 6.2.1 is
             fulfilled and no action is

                                       20




             pending in such respect.

6.3   The Parties  undertake to use all reasonable  endeavors and
      to render to each other all  reasonably  necessary  support
      and  cooperation to ensure that the Closing  Conditions are
      fulfilled as soon as possible  after the Signing  Date.  In
      particular,  though  each  Party  remains  responsible  for
      preparing and making its own required  filings,  Purchasers
      shall  take  the  lead  on such  filings  and  Sellers  and
      Purchasers  shall  cooperate  with one another in preparing
      and making the merger control  filings listed under Section
      6.2.1  above  and in  furnishing  information  regarded  as
      necessary  by  one  of  the  Parties  and/or   required  in
      connection  therewith.  The Parties  shall provide any such
      information   promptly  and  shall  inform  each  other  in
      writing  without  undue  delay as soon as any or all of the
      Closing  Conditions  shall have been fulfilled.  Purchasers
      shall  undertake  or cause to be  undertaken  all  steps to
      remove any  impediments,  restrictions,  or conditions that
      may  affect  the  Closing  Conditions,  including,  but not
      limited to,  Purchasers'  selling or  divesting of tangible
      or intangible  assets or business  operations  necessary to
      receive  the  approval  or  clearance  of   competition  or
      antitrust  authorities in all jurisdictions  referred to in
      Section  6.2,  or to remove any  decision,  order,  decree,
      complaint,  injunction,  or other impediment or restriction
      which  impedes or  threatens  to impede the Closing of this
      transaction.

 6.4  In the  event  that not all  Closing  Conditions  have been
      fulfilled  within 6 (six)  months  after the Signing  Date,
      each Party may withdraw from this Agreement  (Rucktritt) by
      giving written notice to the other Parties,  unless at that
      time the Party  withdraws  from this  Agreement the Closing
      Conditions have been fulfilled.

6.5   Closing  (herein  "Closing")  shall  occur  within five (5)
      Business  Days (as defined in Section 18.8 below) after all
      of the  Closing  Conditions  have  been  fulfilled  (herein
      "Scheduled  Closing  Date"),  but in no event prior to July
      1, 2001.  Sellers  shall notify  Purchasers of the Facility
      Amount  payable to Sellers  within  two (2)  Business  Days
      after the receipt by Sellers of the communication  that all
      Closing Conditions have been fulfilled.

6.6   This  Agreement  shall be closed on the  Scheduled  Closing
      Date,  or any  other  day as agreed  between  the  Parties,
      unless a Party  shall have  withdrawn  from this  Agreement
      pursuant to Section  6.4 above.  On the  Scheduled  Closing
      Date the Parties shall take,  or cause to be taken,  at the
      offices of Mayer,  Brown &  Platt-Gaedertz,  Frankfurt,  or
      such  other  place  as  agreed   between  the  Parties  the
      following  actions  (except  for  those  having  been  duly
      waived) (herein "Closing Events"):

      6.6.1  Payment of the  Preliminary  Purchase  Price and the
             Facility  Amount  into the account of Sellers as set
             forth in Section 4.6 above;

                                       21





      6.6.2  Execution  and delivery of a stock power to transfer
             the US  Shares  to  Purchaser  2 and  execution  and
             delivery by Degussa and DD GmbH of a duly  certified
             application   to   the   commercial   register   for
             registration   of  the   termination  of  DD  KG  by
             succession  to  title  (Gesamtrechtsnachfolge  durch
             Anwachsung) by operation of law;

      6.6.3  Execution   of   the   share   transfer   agreements
             regarding  the  Foreign  Shares  in the  form as set
             forth in Exhibits 6.6.3 (1)-(4);

      6.6.4  Submission by Sellers of signed resignation  letters
             of the board members  representing Sellers which are
             listed  in  Exhibit  6.6.4  and  board   resolutions
             discharging  such board  members of their  duties as
             of  the   Effective   Date   of   their   respective
             resignations;

      6.6.5  Delivery   by    Purchaser   2   of   (i)   evidence
             satisfactory to Sellers that the Degussa  Guarantees
             (as  defined in Section  13.3)  provided  by Degussa
             and its affiliates  within the meaning of Section 15
             German   Stock   Corporation   Act  (AktG)   (herein
             "Affiliates")  other than the  Companies in favor of
             the  Business  have  been  replaced  or  (ii) a bank
             guarantee   in   the   aggregate   amount   of   the
             outstanding  Degussa  Guarantees;  in  each  case in
             accordance with Section 13.3 below;

      6.6.6  Execution of a name and trademark  agreement between
             Degussa  and  DD KG in the  form  as  set  forth  in
             Exhibit 6.6.6;

      6.6.7 Execution   of   the   Brazilian    Share    Transfer
            Instruments.


D.    REPRESENTATIONS AND WARRANTIES, REMEDIES AND INDEMNITIES


7.    Representations and Warranties of Sellers

7.1   Sellers   hereby   represent   (sichern   zu)  and  warrant
      (garantieren)  by way of a separate  promise  of  guarantee
      pursuant  to Section  305 of the Civil Code (BGB) as of the
      Signing  Date  and the  Effective  Date,  unless  expressly
      specified otherwise:

      7.1.1  Enforceability,  No Conflict. As of the Signing Date
             and  Closing  Date,  Degussa is a stock  corporation
             (Aktiengesellschaft)  and DHZ is a limited liability
             company  (Gesellschaft  mit  beschrankter  Haftung),
             duly incorpo

                                       22




             rated and validly  existing under German law. As per
             the Closing Date,  this  Agreement  constitutes  the
             legal,  valid,  and binding  obligation  of Sellers,
             enforceable  under  German laws  against  Sellers in
             accordance   with   its   terms,   except   as   the
             enforceability    thereof    may   be   limited   by
             bankruptcy, insolvency, reorganization,  moratorium,
             or other  similar laws  relating to or affecting the
             rights of  creditors  generally  and except that the
             remedy  of  specific   performance   and  injunctive
             relief and other  forms of  equitable  relief may be
             subject to equitable  defenses and to the discretion
             of the court  before which any  proceeding  therefor
             may be brought.  As per the Signing Date and Closing
             Date,   each  of  Sellers  has  the   absolute   and
             unrestricted right, power,  authority,  and capacity
             to  execute  this   Agreement  and  to  perform  its
             obligations  under  this  Agreement,  which  actions
             have  been  duly  authorized  and  approved  by  all
             necessary  corporate  action of Sellers.  Except for
             the merger control  approvals  required  pursuant to
             Section 6.2 above,  Sellers are not required to give
             any notice to any person or obtain any consent  from
             any third  party or  governmental  authorization  in
             connection  with the execution of this  Agreement by
             Sellers.  Neither the  execution  of this  Agreement
             nor the  consummation  or  performance of any of the
             transactions  contemplated  thereby  will as per the
             Closing  Date  directly  or   indirectly   (with  or
             without  notice  or lapse of  time),  contravene  or
             conflict  of  (i)  any  governmental  authorization,
             legal  requirement  or order to  which  Sellers  are
             bound or  subject;  (ii) any  provision  of Sellers'
             organizational  documents, or any resolution adopted
             by   the   respective   boards   of   directors   or
             shareholders of Sellers.

      7.1.2  Existence of Companies;  Ownership of Shares, German
             Limited  Partnership   Interest  and  the  Brazilian
             Local Management  Shares.  Each of the Companies is,
             as of  the  Signing  Date  and  Closing  Date,  duly
             incorporated  and validly existing under the laws of
             its  jurisdiction.  As  of  the  Closing  Date,  the
             German  Share,   the  Partnership   Interests,   the
             Foreign  Shares and the Brazilian  Local  Management
             Shares  (i)  exist in the  amounts  set out  herein,
             (ii) are  fully  paid-up  and have not been  repaid,
             and (iii) the  ownership  and all rights  pertaining
             to the German Share, the German Limited  Partnership
             and the  Foreign  Shares are owned as  described  in
             Section 1 of this  Agreement  and are free and clear
             of  any  third  party   rights  and  have  not  been
             pledged,  assigned,  charged  or used as a  security
             and,  except for a right of first refusal granted to
             Dental Farma  regarding  the shares held by DD Ltda.
             in  Probem,  there  exist no rights  of  preemption,
             purchase options or call options of third parties.

      7.1.3  Bankruptcy or Judicial Composition  Proceedings.  As
             of the Closing
                                       23




             Date,   no   bankruptcy   or  judicial   composition
             proceedings  concerning  Sellers  or  the  Companies
             have been applied for, and to the Best  Knowledge of
             Sellers no  circumstances  exist which would require
             the  application  for  any  bankruptcy  or  judicial
             composition  proceedings  and to the Best  Knowledge
             of Sellers no  circumstances  exist  pursuant to any
             applicable  bankruptcy  laws which could justify the
             avoidance of this Agreement.

      7.1.4  Affiliates,   Enterprise   Agreements.   As  of  the
             Closing  Date,  except  as  disclosed  in  Section 1
             above,  DD GmbH,  DD KG and DHZ  have no  affiliated
             companies  within  the  meaning of Section 15 German
             Stock  Corporation  Act (AktG) nor do they  maintain
             any  direct  company  relationship  with  any  third
             party,  in  particular  hold  no   participation  or
             sub-participation  in any  other  company  and there
             exist no  enterprise  agreements  within the meaning
             of  Sections  291 and 292 German  Stock  Corporation
             Act (AktG).

      7.1.5  Material  Agreements.  Except for the agreements and
             commitments  listed or disclosed  on Schedule  7.1.5
             the  Companies  are  not a  party  to the  following
             agreements and  commitments  which have not yet been
             completely  fulfilled and the existence of which, or
             the  termination  of which,  could  have a  Material
             Adverse    Effect   (as   defined   below)   (herein
             collectively "Material Agreements")

             (i) loan and credit agreements,  or other agreements
                 or instruments  evidencing  indebtedness  of any
                 of the Companies in excess of Euro  1,000,000.00
                 or securing such  indebtedness  such as pledges,
                 guarantees,    securities    (Burgschaften)   or
                 letters  of comfort  (Patronatserklarungen)  and
                 that will  continue in effect or with respect to
                 which  any  of  the  Companies   will  have  any
                 liabilities after the Closing Date;

             (ii)non-compete,   restrictive  covenants  or  other
                 agreements  that  restrict any of the  Companies
                 from  operating the Business as conducted on the
                 Signing  Date except for  vertical  restrictions
                 under   customary    distributorship,    agency,
                 license  agreements and alike  agreements all of
                 which   are  in   compliance   with   applicable
                 national or EU law;

             (iii)   research    and    development    agreements
                 involving   an   amount   in   excess   of  Euro
                 100,000.00 p.a.;

                                       24





             (iv)trademark,   patent   and   know   how   license
                 agreements  which involve an amount in excess of
                 Euro 100,000.00 p.a.;

             (v) agreements  relating  to toll  manufacturing  of
                 any  product  involving  an  amount in excess of
                 Euro 500,000.00 p.a.;

             (vi)agreements  relating to the  acquisition or sale
                 of   interest   including   assets,   in   other
                 companies or businesses;

             (vii)   lease  agreements  relating  to Real  Estate
                 (as  defined in  Section  10.2.2  below)  which,
                 individually,  provide  for annual  payments  of
                 Euro 500,000.00 or more;

             (viii)  contracts  or other  agreements  relating to
                 construction  or  acquisition of fixed assets or
                 other capital  expenditures  involving an amount
                 in excess of Euro 200,000.00 p.a.;

             (ix)contracts  and  other  agreements  to  purchase,
                 sell,  lease or otherwise  dispose of any assets
                 owned  by  the  Companies   other  than  in  the
                 ordinary course of business  involving an amount
                 in excess of Euro 500,000.00;

             (x) contracts  providing for a payment obligation in
                 excess  of  Euro   250,000.00  p.a.  that  would
                 terminate or could be  terminated as a result of
                 the     consummation    of    the    transaction
                 contemplated under this Agreement;

             (xi)liabilities  to employees  arising from employee
                 inventions   (Arbeitnehmererfindungen   and  the
                 like) in excess of Euro  100,000.00  per  person
                 per invention; and

             (xii)   contracts  or  commitments  giving any party
                 with rights  thereunder  the right to terminate,
                 modify,   accelerate  or  otherwise  change  the
                 existing    rights   or    obligations    of   a
                 Consolidated Company.

             For  the  purpose  of  this   Agreement,   "Material
             Adverse  Effect"  means any change or effect that is
             materially  adverse  to  the  financial   condition,
             results  of  operations,   business   operations  or
             assets  of  either  (i) the  Business  of any of the
             Companies as conducted  in Germany  (herein  "German
             Business")  taken as a whole or (ii) the Business of
             the  Companies  as  conducted  in  the   Netherlands
             (herein "Dutch Business") taken as a

                                       25




             whole or (iii)  the  Business  of the  Companies  as
             conducted   in  the  United   States   (herein   "US
             Business")  taken as a whole or (iv) the Business of
             the   Companies  as   conducted  in  Japan   (herein
             "Japanese Business") taken as a whole.

      7.1.6  Compliance  with  Material  Agreements.   Except  as
             disclosed   in  Schedule   7.1.6,   ,  each  of  the
             Companies  have  complied  with  their   obligations
             under  the  Material  Agreements,   except  for  any
             default or breach  which  would not cause a Material
             Adverse  Effect.  To the Best  Knowledge of Sellers,
             none of the Material  Agreements has been terminated
             by any  Party,  nor  has  any  party  given  written
             notice  about its  intention to terminate a Material
             Agreement.  To the Best  Knowledge  of Sellers,  the
             Material  Agreements  are valid and in full force as
             of the Signing Date.

      7.1.7  Material    Intellectual    Property   Rights.   The
             Companies own and to the Best  Knowledge of Sellers,
             lawfully use all such patents,  design  models,  and
             trade  marks  which  are  material  to  carry on the
             German  Business,  or the Dutch Business,  or the US
             Business   or  the   Japanese   Business,   each  as
             conducted  as of the Signing  Date and each taken as
             a whole (except for licenses of, and similar  rights
             in,  application   software)  (herein   collectively
             "Material  Intellectual Property Rights").  Schedule
             7.1.7  contains  a true  and  complete  list  of all
             Material  Intellectual  Property Rights owned and/or
             used by the Business  indicating  (i) the nature and
             owner of the Material  Intellectual  Property Rights
             and (ii) if applicable,  the  jurisdiction  in which
             such  Material  Intellectual  Property  Rights  have
             been registered and registration information.

      7.1.8  Proceedings   Relating  to   Material   Intellectual
             Property    Rights   and    Products    related   to
             Intellectual   Property.   Except  as  disclosed  in
             Schedule  7.1.8,   the  (i)  Material   Intellectual
             Property  Rights are not  subject to any  pending or
             threatened      proceedings      for     opposition,
             cancellation,  revocation or rectification,  (ii) to
             the  Best  Knowledge  of  Sellers  the  use  of  the
             Material   Intellectual  Property  Rights  does  not
             infringe  any  rights  of third  parties,  and (iii)
             are, subject to customary expiry,  duly administered
             and renewed.  To the Best Knowledge of Sellers,  the
             products and services  currently offered for sale or
             sold   by  the   Business   do  not   infringe   any
             intellectual property rights of third parties.

      7.1.9  Insurance.  The Companies maintain in full force and
             effect for their own benefit  policies of  insurance
             until the Closing Date against  fire,  water,  theft
             and other usually  insured  business risks which are
             listed in  Schedule  7.1.9.  In  addition,  Schedule
             7.1.9 contains the correct and complete

                                       26




             description  of  the  Companies'  product  liability
             loss  history  for the last five (5) years  prior to
             the Signing Date exceeding in each  individual  case
             Euro 50,000.00.

      7.1.10 Material  Assets.  Except as  disclosed  in Schedule
             7.1.10,   the   Companies   own,   or  hold   lawful
             possession  of,  all fixed  assets  (Anlagevermogen)
             and   inventories   (Vorrate)   (i)   necessary  and
             material   for   carrying   out  the   Business   in
             substantially  the same fashion and manner as of the
             Signing  Date and (ii)  which are  reflected  in the
             Financial  Statements  (as defined in Section 7.1.16
             below) or which have been  acquired  after  December
             31,  2000,  except for such assets  which were sold,
             abandoned or  otherwise  disposed of in the ordinary
             course of business  since  December 31, 2000 (herein
             collectively   "Material   Assets").   The  Material
             Assets  are not  charged  with any  rights  of third
             parties   including   the   transfer   for  security
             purposes  (Sicherungsubereignungen)  except  for (i)
             customary    rights    of    retention    of   title
             (handelsubliche     Eigentumsvorbehalte),     liens,
             pledges  or  other  security   rights  in  favor  of
             suppliers,  mechanics,  workers,  carriers  and  the
             like;  (ii) security of rights  granted to banks and
             other  financial  institutions  in  respect  of debt
             reflected  in  the  Financial  Statements  or in the
             Effective Date Accounts;  (iii)  statutory  security
             rights  in  favor  of  tax   authorities   or  other
             governmental  entities. The Material Assets are in a
             useable  condition in order to continue the Business
             substantially  in the same  fashion as  conducted as
             of the Signing  Date.  Neither the execution of this
             Agreement nor the  consummation  or  performance  of
             any of the transactions  contemplated  thereby shall
             result  in  the   creation  of  any  lien   security
             interest,  charge or  encumbrance  upon the Material
             Assets of the Consolidated Companies.  The palladium
             stock as per the Effective  Date shall * * * * * * *
             * * * * * *.

      7.1.11 Permits.  To the  Best  Knowledge  of  Sellers,  the
             Companies   are  in   possession   of  all  material
             governmental   approvals,   licenses   and   permits
             necessary  to operate the  business of each  Company
             as it is  conducted  as of the  Effective  Date  and
             which are material for the German  Business,  or the
             Dutch Business,  or the Japanese Business, or the US
             Business each taken as a whole (herein  collectively
             "Permits")  except as disclosed in Schedule  7.1.11.
             To the Best  Knowledge  of Sellers no  circumstances
             exist which would  reasonably  be expected to result
             in a  revocation  or  limitation  of the  Permits or
             which  would  reasonably  be expected to lead to the
             imposition  of conditions to the Permits which would
             cause a Material Adverse Effect.

      7.1.12 Litigation.  The Companies are not involved in court
             or administrative
                                       27




             proceedings,   including  arbitration   proceedings,
             either   as   plaintiff   or   defendant   having  a
             litigation   value   (Streitwert)   exceeding   Euro
             250,000.00   in  the   individual   case  except  as
             disclosed in Schedule  7.1.12.  There are no product
             liability  claims  pending or to the Best  Knowledge
             of Sellers  threatened  against the Companies with a
             litigation  value  exceeding Euro  250,000.00 in the
             individual case.

      7.1.13 Tax Returns,  Notices.  All tax returns  required to
             be  filed  by  the   Companies   on  or  before  the
             Effective  Date  have been  filed and the  Companies
             have paid all amounts due and owing with  respect to
             such tax returns.

      7.1.14 Collective  Bargaining  Agreements.  Schedule 7.1.14
             includes all  individual  or  collective  employment
             agreements  (i.e.  agreements which are entered into
             between  a  Company  and a group of  employees  or a
             representative  body  of  employees  of  a  company,
             unless such agreements  repeat  mandatory  statutory
             law only) which  contain  (i)  benefit or  incentive
             plans  relating to a change of control of a Company;
             (ii)    limitations    to    terminate    employment
             agreements,   including   providing   for  severance
             payments;  and/or (iii)  obligations of a company to
             make specific  investments or to guarantee a certain
             number of employees.

      7.1.15 Pensions.   All  obligations,   whether  arising  by
             operation of law, by  agreement or past custom,  for
             due payments and due and payable  contributions with
             respect   to  direct   or   indirect   pension   and
             retirement  benefits  to the  employees  and  former
             employees  of the  Companies  pertaining  to periods
             prior to the  Effective  Date  have  been  paid,  or
             shall be paid,  or have  been  sufficiently  accrued
             for in the Financial  Statements except as set forth
             in  Schedule  7.1.15,  and  as it  regards  DD KG in
             accordance    with   German    generally    accepted
             accounting principles.

      7.1.16 Financial  Statements.  The  pro-forma  consolidated
             financial  statements  of the  Companies  listed  in
             Exhibit   7.1.16  (herein   collectively   "Historic
             Consolidated  Companies")  for the fiscal year ended
             on   December   31,   2000   (herein   "Consolidated
             Financial  Statements")  as examined  and audited by
             Sellers'  Auditor,  have been prepared in accordance
             with US GAAP. The Consolidated  Financial Statements
             present a true and fair view of the  assets  and the
             financial  condition  of the  Historic  Consolidated
             Companies   as   per   December   31,   2000.    The
             Consolidated   Financial  Statements  are  based  on
             accounts  which have been  prepared by the  Historic
             Consolidated  Companies,  in  accordance  with local
             GAAP,  on  the  basis  of  Sellers'  accounting  and
             consolidation  standards  which are  referred  to in
             Section 5.1. The part of the spin-off  balance sheet
             relating to
                                       28




             the  assets  and  liabilities  to  be  spun  off  by
             Degussa-Huls  CEE GmbH as per December 31, 2000 into
             DD Austria (herein "Austrian Financial  Statements")
             as examined  and audited by  Sellers'  Auditor,  has
             been  prepared in  accordance  with Austrian GAAP on
             the basis of Sellers'  accounting and  consolidation
             standards  which are referred to in Section 5.1. The
             Austrian  Financial  Statements  present  a true and
             fair   view  of  the   assets   and  the   financial
             condition of DD Austria as per December 31,  2000 as
             it  had  been  in  existence   at  such  date.   The
             Consolidated  Financial  Statements and the Austrian
             Financial   Statements   are   herein   collectively
             referred to as "Financial Statements".

      7.1.17 Compliance   With  Laws.   Except  as  disclosed  in
             Schedule 7.1.17 the Business is conducted,  and will
             be  conducted   from  the  date  of  the   Financial
             Statements  until the Closing  Date in the  ordinary
             course  and  substantially  in  compliance  with all
             applicable   laws  and  Permits   except  where  the
             failure  so to  comply  would  not  have a  Material
             Adverse  Effect.  To the Best  Knowledge of Sellers,
             all  products of the  Companies  fulfill the current
             technical,    biological,   clinical   and   medical
             standards  known and  reasonably  applied in Germany
             and as the case may be the US.  Products sold by the
             Companies  prior to the Closing Date and returned to
             the  Companies  shall not  exceed in the  aggregate,
             based on the sales price of such products,  0.25% of
             the gross  sales  during  the sixty  (60) day period
             immediately preceding the Closing Date.

      7.1.18 Material   Adverse   Changes   after  Signing  Date,
             Conduct  of   Business.   Except  as   disclosed  in
             Schedule    7.1.18,    and   apart   from    general
             developments in the  marketplace,  during the period
             from January 1, 2001 until the Closing Date

             7.1.18.1no material  adverse  changes in the assets,
                     liabilities,  financial  conditions  or  the
                     results  of   operations  of  the  Companies
                     taken  as  a  whole  have  occurred  with  a
                     financial  impact on the Companies  taken as
                     a  whole  exceeding  Euro  2,000,000.00  (in
                     words: Euro two million); and


             7.1.18.2the  Companies  have  continued  to  conduct
                     their respective  business operations in all
                     material  respects in the ordinary course of
                     business  in a manner  consistent  with past
                     practice except for  transactions  reflected
                     in this Agreement.

      7.1.19 Investment   Grants.   No   investment   grants   or
             subsidies exceeding an
                                       29




             amount of Euro  50,000.00  shall be  repayable  as a
             consequence of the  performance of this Agreement or
             any events or circumstances  which were in existence
             on or before the Closing Date.

      7.1.20 Properties.   With  respect  to  the  real  property
             formerly  and/or  presently  owned or  leased by the
             Companies (herein "Properties")  effective as of the
             Effective Date and the Closing Date:

             7.1.20.1Schedule   7.1.20.1   completely  lists  the
                     Properties  of  which  the  Company  is  the
                     owner.  The Companies have good title to all
                     of  the   Properties   listed  in   Schedule
                     7.1.20.1.  The Companies' occupation and use
                     of  the   Properties   listed  in   Schedule
                     7.1.20.1 and the Companies'  conduct therein
                     of the  Business  do not  violate  any  law,
                     rule,  regulation or zoning or use ordinance
                     of  any  governmental  agency  or  authority
                     resulting  in  a  Material  Adverse  Effect.
                     The Properties  which are owned or leased as
                     per the Signing  Date  comprise all the real
                     properties  used  for the  operation  of the
                     Business as  conducted as of the date of the
                     Financial  Statements  and as  prior  to the
                     Effective Date.

             7.1.20.2     Except   as    listed    in    Schedule
                     7.1.20.2,   the   buildings   are   properly
                     maintained  until the  Closing  Date and the
                     structures  and buildings on the  Properties
                     have  no  defects  which  would   materially
                     impair   a   normal   continuation   of  the
                     operations of the business of the Companies.

             7.1.20.3     The  properties  are free of any liens,
                     encumbrances  or claims  of any kind  except
                     for  the  encumbrances   registered  in  the
                     applicable  land  register as of the Signing
                     Date or as shown in Schedule 7.1.20.3.

             7.1.20.4     Except as  reflected  in the  Financial
                     Statements  there  will be no taxes or other
                     administrative  dues  and  fees  outstanding
                     for payment,  including  development charges
                     (herein   "Administrative   Charges")   with
                     respect    to    the     Properties.     All
                     Administrative  Charges  which are allocable
                     to the time  prior to the  Effective  Date -
                     irrespective  of the  fact  when  they  will
                     become  due -  shall  be  reflected  in  the
                     Financial Statements.

             7.1.20.5     The  principal  means of  access to the
                     Properties is over public  roads,  which are
                     maintained at the public expense, or is se

                                       30




                     cured  by   rights   of  way  over   private
                     property  registered  in the  land  registry
                     and  are  not   subject  to  the  rights  of
                     termination   by  any   third   party.   The
                     Properties   making   up  the  site  of  the
                     Companies  enjoy the main services of water,
                     drainage, electricity and gas.

             7.1.20.6     Schedule  7.1.20.6  lists and describes
                     briefly   all  real   property   leased   or
                     subleased  to the  Companies.  Sellers  have
                     delivered or made  available  to  Purchasers
                     correct  and  complete  copies of the leases
                     and subleases  listed in Schedule  7.1.20.6.
                     To the Best  Knowledge  of Sellers each such
                     lease  and  sublease  is in full  force  and
                     effect   against  the  lessee  or  sublessee
                     thereunder in all material respects.

      7.1.21 Purchasers  shall have no obligation or liability to
             pay on behalf of Sellers any fees or  commissions to
             any  broker,  finder or agent  with  respect  to the
             transaction contemplated hereunder.

7.2    All Schedules  referred to in Section 7.1 are collectively
       referred  to as the  "Disclosure  Schedules".  No  further
       representations  and warranties are given other than those
       made or given by Sellers in this Agreement.

7.3    For the purpose of this  Agreement,  "Best  Knowledge"  of
       Sellers  shall  mean the  actual  knowledge  of any of the
       members of the Executive Board (Vorstand) of Degussa,  the
       Management  Board  (Geschaftsfuhrung)  of DHZ or Mr.  Gerd
       Schulte,  Mr.  Rudolf Lehner or Mr. Rainer Krau(beta) after due
       inquiry of the  current  management  of the  Companies  in
       relation to the representations  and warranties  contained
       in Section 7.1 above.


8.    Representations and Warranties of Purchasers and Guarantor

      Purchasers  and Guarantor  each  represents and warrants as
      of the Signing Date and the Effective Date:

8.1   Enforceability,  No Conflict.  This  Agreement  constitutes
      the legal,  valid and binding  obligation of Purchasers and
      Guarantor,  enforceable against Purchasers and Guarantor in
      accordance  with its  terms,  except as the  enforceability
      thereof   may  be   limited  by   bankruptcy,   insolvency,
      reorganization,  moratorium  or other similar laws relating
      to or  affecting  the  rights of  creditors  generally  and
      except  that  the  remedy  of  specific   performance   and
      injunction  relief and other forms of equitable  relief may
      be subject to equitable  defenses and to the  discretion of
      the court

                                       31




      before which any  proceeding  therefor may be brought.  The
      Purchasers    and   Guarantor   have   the   absolute   and
      unrestricted  right,  power,  authority,  and  capacity  to
      execute  this  Agreement  and to  perform  its  obligations
      under  this   Agreement,   which  actions  have  been  duly
      authorized and approved by all necessary  corporate  action
      of Purchasers and Guarantor.  Except for the merger control
      approvals   required   pursuant   to  Section   6.2  above,
      Purchasers  and  Guarantor  are not  required  to give  any
      notice to any person or obtain any consent or  governmental
      authorization  in  connection  with the  execution  of this
      Agreement  by  Purchasers   and   Guarantor.   Neither  the
      execution  of  this  Agreement  nor  the   consummation  or
      performance  of  any  of  the   transactions   contemplated
      thereby   will   directly   or   indirectly   violate   the
      certificate of  incorporation or by-laws or any contract of
      Purchasers  and  Guarantor or violate any  applicable  law,
      rule, regulation,  judgment, injunction, order or decree in
      Germany  or any  other  country  where the  Purchasers  and
      Guarantor are domiciled.

8.2   Litigation.  There is no  action,  suit,  investigation  or
      proceeding   pending  against,   or  to  the  knowledge  of
      Purchasers   and   Guarantor,   as  of  the  Signing  Date,
      threatened  against or affecting  Purchasers  and Guarantor
      before  any  court  or  arbitrator  or  governmental  body,
      agency or official which in any manner  challenges or seeks
      to  prevent,   enjoin,   alter  or  materially   delay  the
      transaction contemplated hereunder.

8.3   Financial    Capability.    Purchasers    have   sufficient
      immediately  available  funds or binding and  unconditional
      and irrevocable  financing  commitments to pay the Purchase
      Price for the Business pursuant to Section 4.1 above.

8.4   Finders'   Fees.   Sellers  shall  have  no  obligation  or
      liability  to pay on  behalf  of  Purchasers  any  fees  or
      commissions to any broker,  finder or agent with respect to
      the transaction contemplated hereunder.

8.5   Acquisition  at Own Account.  Purchasers  are acquiring the
      Business for  investment at  Purchasers'  own account,  and
      neither  as a  nominee  nor  agent  nor  with a view to the
      resale or  distribution  of any part thereof within six (6)
      months  after the  Closing  Date,  and  Purchasers  have no
      present  intention of selling,  granting any  participation
      in, or  otherwise  distributing  the  Business.  Purchasers
      have not entered into any contract, undertaking,  agreement
      or arrangement  with any person to sell,  transfer or grant
      participations to such person or to any third person,  with
      respect to the Business or any part thereof.

8.6   No  Knowledge of Breach.  To  Purchasers'  and  Guarantors'
      knowledge,  there  exists no  breach of any  representation
      and  warranty  made by  Sellers  in this  Agreement,  which
      would  give  rise  to a  claim  under  Section  9  of  this
      Agreement.  For the purpose of this  Section 8  Purchasers'
      and Guarantors' knowledge shall mean the actual

                                       32




      knowledge of the  management  of  Purchasers  and Guarantor
      and individuals who have assisted  Purchasers in connection
      with its due diligence  investigation  and the  negotiation
      and the  execution  of this  Agreement,  as  identified  on
      Exhibit 8.6.


9.    Remedies

9.1   In the event of any  breach or  non-fulfillment  by Sellers
      of any  of the  covenants,  representations  or  warranties
      contained  in this  Agreement,  Sellers  shall be liable as
      joint and  several  debtors  (Gesamtschuldner)  for putting
      Purchasers,  or  at  the  election  of  Sellers,  if  it is
      possible,  the  respective  Company into the same  position
      that  it  would  have  been in if the  representations  and
      warranties  contained  in  Section  7.1 above had been true
      and correct or had not been breached  (Naturalrestitution),
      or,  at  the  election  of  Sellers,  to  pay  damages  for
      non-performance (kleiner  Schadenersatz).  Sellers shall be
      liable for any  consequential  damages  (Folgeschaden)  and
      lost  profits   (entgangener  Gewinn)  provided  that  such
      damages or lost profits  were  adequately  caused  (adaquat
      kausal  verursacht) by such breach of the representation or
      warranty.  Sellers shall not account for any internal costs
      and expenses  incurred by the Companies or  Purchasers.  If
      and to the extent a Purchaser  Claim (as defined in Section
      9.2 below),  other than a claim as to  ownership  of shares
      relates  to  damages  or  losses  incurred  (i) by  Sankin,
      Sellers<180>  obligation  under Section 9.1 shall be limited to
      94 % of the  amount  of  actual  damage  or loss or (ii) by
      Defradental,  Sellers'  obligation  under Section 9.1 shall
      be limited  to 45 % of the amount of actual  damage or loss
      or (iii) by Probem,  Sellers'  obligation under Section 9.1
      shall be limited to 60 % of the amount of actual  damage or
      loss.

9.2   In the event of any  breach or  non-fulfillment  by Sellers
      of any  representations  or  warranties  contained  in this
      Agreement  (herein  "Purchaser  Claim"),  Purchasers  shall
      give  Sellers  notice of such  breach  or  non-fulfillment,
      with such notice  stating the nature thereof and the amount
      involved,   to  the  extent   that  such  amount  has  been
      determined  at the time when such notice is given  promptly
      after  discovery  of such  breach or  non-fulfillment.  The
      failure to give such notice  shall not preclude or bar such
      claims  but  shall  reduce  such  claims  to the  extent of
      prejudice  to  the  Sellers.   Without   prejudice  to  the
      validity  of  the  Purchaser  Claim  or  alleged  claim  in
      question,  Purchasers shall allow,  within thirty (30) days
      of  Purchasers'  notice and shall  cause the  Companies  to
      allow,    Sellers   and   their   accountants   and   their
      professional   advisors  to   investigate   the  matter  or
      circumstance  alleged to give rise to such Purchaser Claim,
      and  whether  and to what  extent  any amount is payable in
      respect  of such  Purchaser  Claim and,  for such  purpose,
      Purchasers  shall  give and shall  cause the  Companies  to
      give,   subject  to  their  being  paid  their   reasonable
      out-of-pocket  costs and  expenses,  such  information  and
      assistance,   including   access  to  Purchasers'  and  the
      Companies'  premises and  personnel and including the right
      to
                                       33




      examine  and  copy  or  photograph  any  assets,  accounts,
      documents and records,  as Sellers or their  accountants or
      professional advisors may reasonably request.

9.3   Sellers shall not be liable for, and  Purchasers  shall not
      be  entitled  to bring,  any  Purchaser  Claim or any other
      claim under or in connection  with this  Agreement,  if and
      only to the extent that:

      9.3.1  the matter to which the Purchaser  Claim relates has
             been taken into account in the Financial  Statements
             by   way   of   a   provision   (Ruckstellung),   or
             depreciation    (Abschreibung),    or    exceptional
             depreciation  (au(beta)erplanma(beta)ige   Abschreibung),   or
             depreciation   to  reflect   lower   market   values
             (Abschreibung  auf  den  niedrigeren   beizulegenden
             Wert);

      9.3.2  the matter to which the Purchaser  Claim relates has
             been  taken  into  account  in  the  Effective  Date
             Accounts  for  the   determination  of  the  Working
             Capital;

      9.3.3  the amount of the Purchaser  Claim is recovered from
             a third  party or an  insurance  policy  in force on
             the Effective Date;

      9.3.4  the  Purchaser  Claim  results  from  a  failure  of
             Purchaser  or  the  Companies  to  mitigate  damages
             pursuant to Section 254 German Civil Code (BGB);

      9.3.5  the matter which gives rise to the  Purchaser  Claim
             , was known by any of the  Purchasers  or  Guarantor
             as of the Signing Date;  in this regard,  Purchasers
             acknowledge  the  receipt  of  (i)  the  Information
             Memorandum  prepared by UBS  Warburg AG,  Frankfurt,
             dated
             March 12,  2001,  including  the two (2)  correction
             statements  referring  thereto  (ii) the final draft
             financial  due  diligence  report Volume 1a- Summary
             prepared     by     PricewaterhouseCoopers      GmbH
             Wirtschaftsprufungsgesellschaft,   Frankfurt,  dated
             March  28,   2001,   and   (iii)  the  final   draft
             environmental   due  diligence  report  prepared  by
             ENVIRON Germany GmbH, Essen, dated March 2001;

      9.3.6  the Purchaser  Claim results from or is increased by
             the  passing  of,  or  any  change  in,   after  the
             Effective Date, any law, statute,  ordinance,  rule,
             regulation,   common  law  rule  or   administrative
             practice    of    any    government,    governmental
             department,  agency  or  regulatory  body  including
             (without   prejudice  to  the   generality   of  the
             foregoing)  any  increase  in the rates of Taxes (as
             defined in Section 11.1 below) or any  imposition of
             Taxes or any  withdrawal  or relief  from  Taxes not
             actually (or  prospectively)  known to Sellers or in
             effect at the Effective Date;

                                       34





      9.3.7  the  procedures  set forth in  Sections  9.5  and/or
             11.4  were  not  observed  by   Purchasers   or  the
             Companies and Sellers were prejudiced thereby.

9.4   Sellers  shall not be liable for any  Purchaser  Claim,  if
      and to the extent either  Purchasers or the Companies  have
      caused  (verursacht  oder   mitverursacht)  such  Purchaser
      Claim after the Effective Date.

9.5   If  the   Companies  or  any  of   Purchasers  is  sued  or
      threatened to be sued by a third party,  including  without
      limitation any government agencies,  or if the Companies or
      Purchasers  are  subjected to any audit or  examination  by
      any tax authority  (herein "Third Party Claim"),  which may
      give rise to a Purchaser  Claim or a claim under Section 11
      below,  Purchasers shall give Sellers prompt notice of such
      Third Party Claim.  Purchasers,  at Sellers expense,  shall
      ensure that Sellers shall be provided  with all  materials,
      information  and  assistance  relevant  in  relation to the
      Third  Party  Claim,  be given  reasonable  opportunity  to
      comment or  discuss  with  Purchasers  any  measures  which
      Sellers  propose  to take or to omit in  connection  with a
      Third  Party  Claim,  and in  particular  Sellers  shall be
      given an  opportunity  to comment on,  participate  in, and
      review  any  reports  and  all   relevant  tax  and  social
      security  audits  or other  measures  and  receive  without
      undue delay copies of all relevant  orders  (Bescheide)  of
      any authority.  No admission of liability  shall be made by
      or on behalf of the  Purchasers  or the  Companies  and the
      Third Party Claim shall not be compromised,  disposed of or
      settled  without the prior  written  consent of the Sellers
      which consent shall not be unreasonably withheld.  Further,
      Sellers  shall be entitled at their own  discretion to take
      such action (or cause the  Purchasers  or the  Companies to
      take such  reasonable  action) as they shall deem necessary
      to  avoid,   dispute,   deny,   defend,   resist,   appeal,
      compromise  or contest  such Third Party  Claim  (including
      making   counter  claims  or  other  claims  against  third
      parties) in the name of and on behalf of the  Purchasers or
      the Companies  concerned and the  Purchasers  will give and
      cause the  Companies  to give,  subject  to them being paid
      all reasonable  out-of-pocket costs and expenses,  all such
      information and assistance,  as described above,  including
      access to premises and  personnel  and  including the right
      to examine and copy or  photograph  any  assets,  accounts,
      documents   and  records  for  the  purpose  of   avoiding,
      disputing,   denying,  defending,   resisting,   appealing,
      compromising  or contesting  any such claim or liability as
      Sellers  or  their  professional  advisors  may  reasonably
      request.   Sellers  agree  to  use  all  such   information
      confidentially  and only for such  purpose.  All  costs and
      expenses  reasonably  incurred by Sellers in defending such
      Third Party Claim shall be borne by Sellers.

9.6   The Parties are in agreement  that the  remedies  which the
      Purchasers,  or any  of the  Companies,  may  have  against
      Sellers for breach of obligations set forth in this

                                       35




      Agreement are solely  governed by this  Agreement,  and the
      remedies  provided  for  by  this  Agreement  shall  be the
      exclusive remedies  available to Purchasers,  or any of the
      Companies.  Apart  from  the  rights  of  Purchasers  under
      Section 6.4 above,  this  Section 9 and  Sections 10 and 11
      below (i) any right of  Purchasers  to withdraw  (Wandlung)
      or rescind  (Rucktritt)  from this  Agreement or to require
      the winding up of the  transaction  contemplated  hereunder
      (e.g. by way of gro(beta)er Schadenersatz),  and (ii) any claims
      for  breach  of   pre-contractual   obligations  (culpa  in
      contrahendo),    or   ancillary    obligations    (positive
      Forderungsverletzung),  except  claims for  willful  deceit
      (arglistige  Tauschung),  are hereby expressly excluded and
      waived by Purchasers.


10.   Environmental Indemnity

10.1  Sellers shall,  subject to the provisions contained in this
      Section 10, as joint and several debtors indemnify,  defend
      and  hold   harmless   Purchasers   from  and  against  all
      Environmental  Liabilities  (as  defined in Section  10.2.1
      below)  resulting  from (i) a final  (bestandskraftig)  and
      enforceable  (vollziehbar)  order,  decree or demand issued
      by  any  governmental  authority  (Behorde),   or  (ii)  an
      imminent  danger to the well-being or health  (unmittelbare
      Gefahr  fur  Leib  oder  Leben),  or  (iii) a  final  court
      judgment  rendered in  connection  with a private  party or
      governmental  claim,  in each case  relating to an Existing
      Environmental  Condition  (as  defined  in  Section  10.2.2
      below).   Section   9.1   fourth   sentence   shall   apply
      accordingly.

10.2  Environmental    Liabilities,     Existing    Environmental
      Condition,  Environmental  Laws,  Hazardous  Materials  and
      Environmental   Matters   shall  each  have  the  following
      meaning:

      10.2.1 "Environmental  Liabilities" means the amount of all
             losses,  costs  and  expenses  including  reasonable
             legal   fees,    expenses   and   disbursements   in
             connection with (i) an investigation  (Ma(beta)nahmen der
             Gefahrerkundung,      Untersuchungsma(beta)nahmen)     in
             connection   with  the   identification   of  or  in
             anticipation   of  a  remediation   of  an  Existing
             Environmental    Condition,    (ii)   a   clean   up
             (Sanierung)   within  the   meaning  of   applicable
             Environmental  Laws  of  an  Existing  Environmental
             Condition,  (iii)  protective  containment  measures
             (Schutz-,  Sicherungs  und  Beschrankungs-ma(beta)nahmen)
             within  the  meaning  of  applicable   Environmental
             Laws,   relating   in  each  case  to  an   Existing
             Environmental   Condition,   or  (iv)   measures  to
             eliminate,  reduce or  otherwise  remedy an imminent
             danger to the  well-being  or the health  (Ma(beta)nahmen
             zur  Abwehr  von  unmittelbaren  Gefahren  fur  Leib
             oder  Leben) resulting from an Existing Environ

                                       36




             mental Condition.

      10.2.2 "Existing  Environmental  Condition"  means  (i) the
             pollution or  contamination  of the soil,  ground or
             air   within   the   meaning   of   any   applicable
             Environmental  Laws of the Real Estate  currently or
             previously  owned  or  used  by the  Companies,  the
             currently   used  or   owned   Real   Estate   being
             identified   in   Exhibit   10.2.2   (herein   "Real
             Estate"),  (ii) the contamination of the groundwater
             beneath the Real  Estate,  (iii) the disposal of any
             Hazardous  Materials  used,  generated  or stored by
             the  Companies  at any on site or offsite  location,
             provided,   however,  in  each  case  such  Existing
             Environmental  Condition  existed  at,  or prior to,
             the  Closing  Date,  or (iv)  any  violation  of the
             applicable  Environmental  Law  arising  out  of the
             operations of the Business prior to Closing Date.

      10.2.3 "Environmental   Laws"  mean  all  applicable  laws,
             ordinances,    rules,    regulations   relating   to
             Environmental  Matters and being applicable  anytime
             prior to and as of the  Closing  Date in (i) Germany
             as  it  regards  the  German  operations,  (ii)  the
             United  States  as it  regards  the  US  operations,
             (iii)   Brazil   as   it   regards   the   Brazilian
             operations,  (iv) Japan as it regards  the  Japanese
             operations,  (v)  Italy as it  regards  the  Italian
             operations,  (vi) The  Netherlands as it regards the
             Dutch  operations,  and (vii)  Austria as it regards
             the Austrian operations.

      10.2.4 "Hazardous    Materials"    mean   any   pollutants,
             contaminants  or toxic  substances  that are defined
             as such in the  Environmental  Laws or give  rise to
             actions    by    competent     authorities     under
             Environmental laws.

      10.2.5 "Environmental  Matters" mean any matter relating to
             pollution  or  contamination  or  protection  of the
             soil,  ground water,  surface water, land surface or
             ground air.

10.3  Sellers'   obligation   to  indemnify   and  hold  harmless
      Purchasers  pursuant  to  Section  10.1 above  shall  apply
      only,  if and to the extent that the costs and  expenses in
      relation  to  the  relevant  Environmental   Liability  are
      incurred   by   Purchasers   prior  to  the  fourth   (4th)
      anniversary  of the  Effective  Date and have been notified
      to  Sellers in writing  prior to such date.  Provided  that
      the  Environmental  Threshold Amount (as defined in Section
      12.3.2 below) is exceeded,  any  Environmental  Liabilities
      exceeding  the  Environmental  Threshold  Amount  up  to an
      amount of Euro  1,000,000.00  (in words:  Euro one million)
      shall  be  shared  between  Sellers  on the  one  hand  and
      Purchasers  on  the  other  hand  on  a  80:20  split.  Any
      Environmental   Liability   exceeding   the   Environmental
      Threshold Amount plus the amount of Euro

                                       37




      1,000,000.00  (in words:  Euro one million)  shall be borne
      by Sellers in accordance  with the terms of this Agreement.
      Further,  the  obligation  to indemnify  and hold  harmless
      Purchasers  shall be  excluded,  if and to the  extent  the
      respective Environmental Liability:

      10.3.1 is   incurred   as  a  result   of   investigations,
             preparatory    or     exploratory     measures    or
             notifications   after   the   Closing   Date   which
             Purchasers  were not  obliged to carry out under the
             applicable  laws,  ordinances,   rules,  regulations
             under the respective  jurisdiction  which (i) relate
             directly  to  Environmental  Matters,  and  (ii) are
             applicable   at  the  time   when   the   respective
             Environmental   Liability   was  incurred  it  being
             understood  however,  that any environmental  audits
             conducted  in  accordance  with  Purchasers   normal
             practice  as applied to its other  properties  shall
             not  exclude  Sellers'  indemnification   obligation
             hereunder and pursuant to Section 10.1 above;

      10.3.2 is  incurred  as a  consequence  after  the  Closing
             Date  of (i)  grossly  negligent  omissions  to take
             actions  required to be taken by the Companies under
             the applicable laws, ordinances,  rules, regulations
             under the respective  jurisdiction relating directly
             to  Environmental  Matters and being  applicable  at
             the   time   when   the   respective   Environmental
             Liability was incurred,  or (ii) activities  outside
             of the ordinary  course of business of the Companies
             (as  conducted as of the  Effective  Date) after the
             Closing Date, or (iii) any grossly  negligent act or
             omission of an employee or other  representative of,
             or  service  provider  to, the  Companies  after the
             Closing Date;

      10.3.3 results   from  any   failure  to  take   reasonable
             measures to  minimize  risks (dem  jeweiligen  Stand
             der    Technik    entsprechende     Ma(beta)nahmen    der
             Gefahrenabwehr)     or    to    apply     reasonable
             environmental  and safety  standards (dem jeweiligen
             Stand  der   Technik   entsprechende   Umwelt-   und
             Sicherheitsstandards)  which,  in each case,  should
             have been reasonably taken by a prudent  businessman
             after the Closing Date;

      10.3.4 results  from  the  coming  into  force  of,  or the
             change in, any Environmental  Laws after the Closing
             Date  except to the extent  such  results  relate to
             actions taken by the Companies  prior to the Closing
             Date;

      10.3.5 the  procedures  set forth in Section  10.4 have not
             been complied  with,  but only to the extent Sellers
             were  prejudiced  for the  non-compliance  with such
             procedures.

      Apart  from  the   foregoing,   Section   9.3  shall  apply
             accordingly.

                                       38





10.4  If any of  Purchasers  becomes  aware of any  circumstances
      which  might  give rise to an  Environmental  Liability  of
      Sellers under  Section 10.1 above,  then  Purchasers  shall
      inform Sellers in writing  thereof  without undue delay and
      any measures  within the meaning of Section 10.2.1 (i)-(iv)
      shall be conducted  solely in  consultation  with  Sellers.
      Sellers  shall be given  access at their own expense to the
      Real  Estate and the books and  records of  Purchasers  (or
      any of its  successors,  as the case may be) to the  extent
      that such  access is  reasonably  necessary  to assess  any
      Environmental  Liability being incurred.  Purchasers  shall
      ensure  that  for as long  as  Sellers  may be held  liable
      under  Section 10.1,  copies of all  documents  relating to
      the Real Estate  which,  as of the Closing  Date are in the
      possession  of the  Companies  will be kept  available  for
      inspection  by Sellers  at the  premises  of the  Companies
      upon Sellers' reasonable  request.  Section 9.5 shall apply
      accordingly.


11.   Tax Indemnity

11.1  Sellers  shall  as joint  and  several  debtors  indemnify,
      defend and hold harmless  Purchasers  or, at the discretion
      of  Purchasers,  the  Companies,  against any taxes customs
      obligations,  obligations relating to levies and any social
      security  obligations,  including  interest  and  penalties
      thereon  (herein  collectively  "Taxes")  imposed under the
      applicable  laws and relating to the  Companies for periods
      ending on or before the Effective  Date, to the extent such
      Taxes  (i)  have  not been  reserved  for in the  Financial
      Statements,  and (ii) have become  non-appealable.  Section
      9.1 fourth sentence shall apply accordingly.

11.2  In relation to tax  accruals,  tax  releases,  tax benefits
      and  changes  in the  accounting  practices  the  following
      shall apply:

      11.2.1 Accruals  made  for  Taxes of the  Companies  in the
             Financial  Statements  may be applied  and  credited
             against any claim by the  Purchasers  under  Section
             11.1   irrespective   of  whether  such  accrual  or
             reserve  was  made for the Tax  giving  rise to such
             claim,  provided  that the total amount of the Taxes
             is  not  in  excess  of  the  total  amount  of  the
             accruals  made  for  Taxes of the  Companies  in the
             Financial Statements.

      11.2.2 If the  Companies or their  Affiliates  are entitled
             to or receive  any  benefits  by refund,  set-off or
             reduction  of Taxes as the  result of an  adjustment
             or   payment    giving   rise   to   a   claim   for
             indemnification  of  Taxes,  then the  corresponding
             benefit  shall reduce the claim for  indemnification
             of any  such  Tax.  This  shall  in  particular  but
             without  limitation  apply to any Tax benefits after
             the Effective Date  resulting  from the  lengthening
             of any amorti

                                       39




             zation or depreciation periods,  higher depreciation
             allowances   or  carry   forwards   of   losses   or
             deductions.

      11.2.3 Sellers  shall  not  be  responsible   for  any  Tax
             liabilities  attributable  to  periods  ending on or
             before the Effective  Date resulting from any change
             in  the  accounting   and  taxation   principles  or
             practices  of the  Companies  (including  methods of
             submitting  taxation  returns)  introduced after the
             Closing  Date,  except if required  under  mandatory
             law.

11.3  Any additional  profit and loss allocations  resulting from
      any tax audit  relating  to  taxable  periods  ending on or
      before the Effective Date shall not entitle  Sellers to any
      additional  profit   distribution  nor  the  Purchasers  or
      Sellers to any Purchase Price Adjustment,  however, the Tax
      indemnity of Section 11.1 shall remain unaffected.

11.4  Purchasers shall keep Sellers fully informed  regarding the
      commencement  of any tax  audit or other  proceeding  which
      may give rise to a claim  under  Section  11.1  above,  and
      Sellers may take such  actions as provided in Section  9.5.
      and Section 9.2 shall apply mutatis mutandis.

11.5  Sellers shall be entitled to any refunds of Taxes  received
      by the Companies  attributable to any taxable period ending
      on or before the Effective Date.

11.6  In  relation  to  the   preparation   of  tax  returns  the
      following shall apply:

      11.6.1 Sellers  shall file (or cause the Companies to file)
             all tax returns  which (i) are due to be filed by or
             on behalf of the  Companies on or before the Closing
             Date, or (ii) are filed on a consolidated,  combined
             or unitary  basis and which  include  the  Companies
             for taxable  periods ending on or before the Closing
             Date.  Purchasers shall file (or cause the Companies
             to file) all tax returns  other than those  referred
             to in the preceding sentence.

      11.6.2 Sellers  shall be  provided a copy of any tax return
             to be filed by  Purchasers  or a  Company  after the
             Closing Date relating to a taxable period  beginning
             before  the  Effective  Date  when  such  return  is
             completed by Purchasers.

      11.6.3 With  respect  to any  tax  return  to be  filed  by
             Sellers which  includes any periods ending after the
             Effective   Date,   after  review  and  approval  by
             Purchasers,  which approval may not be  unreasonably
             withheld,  Purchasers  shall  pay  Sellers  no later
             than  ten  (10)  days  prior to the due date of such
             tax return an amount equal to its Tax  liability for
             such periods de
                                       40




             termined on a "stand alone" basis.

11.7  The  Parties  agree to fully  cooperate  with each other in
      connection  with any matter relating to Taxes including the
      preparation  of any  tax  return,  conduct  of  any  audit,
      investigation or contest.  Such cooperation  shall include,
      without  limitation,  providing  or  making  available  all
      relevant   books,   records  and   documentation   and  the
      assistance of officers and employees.  The Purchasers agree
      to retain all books, records and documentation  relating to
      the Companies  that may be relevant in connection  with any
      audit  or  investigation  for  which  the  Sellers  may  be
      responsible   hereunder   until  the   expiration   of  any
      applicable statute of limitation.  Further,  the Purchasers
      shall  cause the  Companies  to furnish to Sellers all such
      information  as may be  necessary or helpful for Sellers to
      prepare any tax return to be filed after the Closing  Date,
      provided that Sellers  shall  reimburse  Purchasers'  costs
      which  are  more  than  de  minimis  for  furnishing   such
      information.


12.   Expiration of Claims; Limitation of Claims

12.1  All claims of Purchasers  arising under this  Agreement are
      time-barred  within  twenty  four  (24)  months  after  the
      Signing Date, except for:

      12.1.1 all claims of  Purchasers  arising  under Section 10
             above (Environmental  Indemnity) which shall be time
             barred  on  the  fourth  (4th)  anniversary  of  the
             Effective Date;

      12.1.2 all claims of  Purchasers  arising  under Section 11
             above (Tax  Indemnity)  which  shall be time  barred
             for each Tax six (6)  months  after  the date of the
             final,   non-appealable  assessment  concerning  the
             respective Tax;

12.1.3     all claims of  Purchasers  in  respect of  liabilities
             for  defects  of  title  arising  from a  breach  in
             respect of Section  7.1.2  above which shall be time
             barred  on  the  tenth  (10th)  anniversary  of  the
             Effective Date;

12.1.4     Claims based on fraud, which shall have no time limit.

12.2  The  aforesaid   limitations  periods  for  any  claims  of
      Purchasers  shall be  interrupted  pursuant  to Section 208
      German   Civil  Code   (BGB)  by  any  timely   demand  for
      fulfillment  pursuant  to  Section  9.2,  Section  10.4  or
      Section  11.1  above,  as the  case may be,  provided  that
      Purchasers  commence  judicial  proceedings  within six (6)
      months  after the  expiration  of the  relevant  period set
      forth in Section 12.1 above,  or through  timely  notice of
      acknowledgment of claim (Anerkenntnis).

                                       41





12.3  Sellers'  aggregate  liability  under Sections 7, 9, 10 and
      11 shall not exceed
      Euro  40,000,000.00  (in  words:  Euro forty  million).  No
      liability shall attach to Sellers

      12.3.1 under  Section 7 and  Section 9 unless and until the
             aggregate of all claims  (excluding  any  De-minimis
             Claims)  exceed Euro  5,000,000.00  (in words:  Euro
             five million) (herein "Threshold Amount");

      12.3.2 under  Section 10 unless and until the  aggregate of
             all claims (excluding any De-minimis  Claims) exceed
             Euro  1,000,000.00  (in  words:  Euro  one  million)
             (herein "Environmental Threshold Amount");

      12.3.3 under  Section 11 unless and until the  aggregate of
             all claims (excluding any De-minimis  Claims) exceed
             Euro  1,000,000.00  (in  words:  Euro  one  million)
             (herein "Tax Threshold Amount").

      Purchasers  shall not be  entitled  to pursue any claim and
      no liability  shall attach to Sellers under this  Agreement
      in regard to any  claims  of less than Euro  50,000.00  (in
      words: Euro fifty thousand) (herein  "De-minimis  Claims").
      If  either   (i)  the   Threshold   Amount,   or  (ii)  the
      Environmental  Threshold Amount, or (iii) the Tax Threshold
      Amount is  exceeded,  Purchasers  shall be  entitled to the
      payment of damages  pursuant to this  Agreement only in the
      exceeding  amount  (Freibetrag).  The limitations  provided
      for in this  Section  12.3  shall not  apply to any  claims
      against Sellers under Section 7.1.1 and 7.1.2.


E.    COVENANTS, NON-COMPETE UNDERTAKING


13.   Covenants / Purchasers' Indemnity

13.1  Sellers  shall ensure that the Business  will be managed in
      the  ordinary  course  between  the  Signing  Date  and the
      Closing Date  consistent  with past  practice  prior to the
      Signing Date.

13.2  For the period  between  the  Signing  Date and the Closing
      Date,  Sellers  shall ensure that the  Companies  shall (i)
      preserve  their customer and employee  relationships,  (ii)
      preserve  the  assets  of  the  Business  in  good  working
      condition,  reasonable  wear and tear excepted,  (iii) keep
      the  existing  amounts of  insurance  for the  Business  in
      place,  (iv) maintain  accounting  procedures and its books
      and records  consistent  with past  practice,  (v) not make
      any dividend payments or other distributions of

                                       42




      such kind to Sellers  or their  Affiliates,  (vi)  maintain
      and  protect  all of its  Material  Intellectual  Property,
      (vii)  comply  with  applicable   legal   requirements  and
      contractual  obligations  (viii)  continue  to conduct  its
      operations  at  all  locations  at  which   operations  are
      presently  conducted,  in the  ordinary and usual course of
      business  consistent  with  past  practices,   (ix)  permit
      Purchasers and their  employees,  agents and accounting and
      legal  representatives  to  have  access  to  the  records,
      personnel and  facilities of the  Companies.  Further,  for
      the period  between the Signing Date and the Closing  Date,
      Sellers  shall ensure that the  Companies  will not without
      the consent of  Purchasers,  except in the ordinary  course
      of business and  consistent  with past  practice (i) permit
      any of the  Material  Assets (as defined in Section  7.1.10
      above)  to be  subjected  to any  mortgage,  pledge,  lien,
      security, interest, encumbrance,  restriction, or charge of
      any kind,  except for those  arising by  operation  of law,
      (ii) make any material capital expenditure (i.e.  exceeding
      an amount of Euro  500,000.00)  or  commitment  therefor or
      enter into any material  contract,  agreement or commitment
      with  onerous  terms  which  are not  consistent  with past
      practices,  (iii) grant any  increase  in wages,  salaries,
      bonus or other  remuneration  of any employee,  (iv) cancel
      or waive any  claims or  rights  which may have a  Material
      Adverse  Effect,  (v)  authorize  or issue  any  shares  of
      capital  stock of the  Companies or any options or warrants
      with respect  thereto,  or declare or pay any  dividends or
      make any  distributions  upon or  acquire  or redeem any of
      its  equity  securities,  (vi)  agree,  whether  or  not in
      writing, to do any of the foregoing.

13.3  With effect as of the Closing Date,  Purchaser 2 (i) hereby
      assumes at the terms set out  hereinafter  the  guarantees,
      comfort  letters and other  guarantees  of any kind (all of
      which are  listed in  Exhibit  13.3)  (herein  collectively
      "Degussa   Guarantees")  which  Degussa  or  any  of  their
      Affiliates  (other  than the  Companies)  have  provided in
      favor of the  Companies  with respect to the  Business,  to
      banks, other financial institutions,  suppliers,  customers
      or other third parties,  and (ii) shall  indemnify and hold
      harmless   Degussa  and  all  such   Affiliates   from  all
      obligations and liabilities  arising after the Closing Date
      out  of or  in  connection  with  the  Degussa  Guarantees.
      Purchaser  2  shall  further,  prior  to or on the  Closing
      Date,  either (i) replace the  Degussa  Guarantees  and any
      additional   guarantees,    comfort   letters   and   other
      guarantees  of any kind which may be  provided  in favor of
      any Company with respect to the Business  after the Signing
      Date  (provided  that  Degussa  shall  notify  Purchaser  2
      thereof at least ten (10)  business days before the Closing
      Date),  so  that  Degussa  and  the  Affiliates  are  fully
      released  from such  Degussa  Guarantees  as of the Closing
      Date; or (ii) provide,  on or prior to the Closing Date, an
      unconditional  bank  guarantee  (issued  by a  first  class
      German  bank)  payable  upon  first  demand for each of the
      relevant  Degussa  Guarantees in an aggregate  amount equal
      to the  aggregate  amount  of the  outstanding  obligations
      secured  by  such   Degussa   Guarantee   as   notified  to
      Purchasers  by  Degussa  at least  ten (10)  business  days
      before the Closing Date.
                                       43





13.4  If after the Closing  Date  Sellers are held liable for any
      liability  arising in  connection  with the  conduct of the
      Business  by a third  party,  including  but not limited in
      connection with any Environmental  Matter,  then Purchasers
      and Guarantor,  jointly and severally  shall  indemnify and
      hold   harmless   Sellers  in   respect  of  the   relevant
      liability,  unless  and to the extent  Purchasers  have the
      right to claim  indemnification  from Sellers in respect of
      the relevant  liability  under the terms of this Agreement.
      Purchasers  and Guarantor,  jointly and severally  shall in
      particular  indemnify and hold harmless Sellers,  and their
      respective Affiliates,  officers, directors,  shareholders,
      employees and agents against any and all  liability,  loss,
      damage   or   injury,    together   with   all   reasonable
      out-of-pocket   costs  and   expenses   relating   thereto,
      including    reasonable    legal   fees,    expenses    and
      disbursements,   arising  out  of,   connected   with,   or
      resulting  from any such third  party  claim.  Section  9.5
      shall apply mutatis mutandis.

13.5  Purchasers  shall  see to it  that  each  of the  Companies
      shall support and assist Degussa,  at Degussa's expense, in
      connection  with any  litigation  or any other  proceedings
      brought or initiated  against  Degussa in  connection  with
      the Business sold and transferred to Purchasers  under this
      Agreement.

13.6  Degussa  represents and warrants  (garantiert)  by way of a
      separate  promise of  guarantee  pursuant  to  Section  305
      German  Civil  Code  that  as of the  Closing  Date  (i) an
      irrevocable  offer by Degussa  Pensionskasse in favor of DD
      KG to waive its  hereditary  building  right  (Erbbaurecht)
      relating to the real estate in Hanau-Wolfgang,  Germany, on
      which the administration  building of DD KG is located,  in
      consideration  of a  total  purchase  price  not  exceeding
      DM 20,000,000.00  (in words:  Deutsche Mark twenty million)
      validly exists and (ii) any necessary  official permits for
      such  waiver  of the  hereditary  building  right  had been
      obtained  including  the  consent of Degussa  Pensionskasse
      according to Section 70 of the Act on State  Supervision of
      Insurance Companies (Versicherungsaufsichtsgesetz).

13.7  Sellers  shall   co-operate   on  a  reasonable   basis  at
      Purchasers' cost,  including  instructing Sellers' Auditors
      in  connection  with the  procurement  by  Purchasers  with
      pro-forma   consolidated   financial   statements   of  the
      Business  for the fiscal  years ended on December  31, 1998
      and December 31, 1999 and the period  ending in 2001 on the
      Closing  Date  which  are  reconciled  or are  prepared  in
      accordance with US GAAP and US Generally  Accepted Auditing
      Standards (herein "US GAAS").


                                       44





14.   Non-Compete Undertaking

14.1  Sellers agree not to engage,  directly or indirectly,  as a
      proprietor,  shareholder,  partner,  employee,  independent
      contractor  or  otherwise  in  any  business   which  would
      compete in any way with the  Business  as  defined  herein,
      except  for  the  activities   described  in  Exhibit  14.1
      (herein  "Permitted  Activities")  for three (3) years from
      the  Closing  Date.  Sellers  further  agree not to solicit
      directly or indirectly outside of the Permitted  Activities
      for a period of three (3) years  from the  Closing  Date or
      otherwise  contact  any  present or past  customers  of the
      Business,  for  themselves  or any  other  person,  firm or
      corporation,  for the  purpose  of  obtaining  business  in
      competition  with the  Business as it exists on the Closing
      Date other than Permitted  Activities.  It is hereby agreed
      that the  covenant  not to  compete  of this  Section  14.1
      applies  mutatis  mutandis to any disclosure by the Sellers
      of  confidential  information  relating to the  Business or
      the Companies  except if and to the extent the  information
      is or becomes public knowledge,  is disclosed to Sellers in
      good faith from another  source,  is  discovered by Sellers
      otherwise  than by  disclosure  from  the  Companies  or is
      required  to be  disclosed  by  Sellers  to a  governmental
      authority.

14.2  Nothing in Section  14.1 above shall  prohibit  (i) Sellers
      from acquiring  ownership of an equity interest not greater
      than ten percent  (10%) of any class of  securities  or the
      voting  rights in a  publicly  held  company  engaged  in a
      business in competition with the Business,  or (ii) Sellers
      from  offering  employment  to any employee of any customer
      of the  Business,  or (iii) from  engaging in the Permitted
      Activities.  Nothing in Section 14.1 shall prevent  Sellers
      from  acquiring,  directly or indirectly,  shares in or the
      undertaking  or assets of any  company  which  carries on a
      business  which  competes  with the Business as carried out
      on the  Closing  Date  (herein  "Competing  Business"),  if
      Sellers  shall  cease to carry on or have such  interest in
      the Competing  Business or the company carrying on the same
      within  one  (1)  year  from  completion  of  the  relevant
      acquisition  disposed of. But nothing in Section 14.1 above
      shall  require  the  Sellers  to  cease  to  carry  on  the
      Competing  Business  or to  dispose  of the  same  or  such
      interest   within  one  (1)  year  as  provided,   if  such
      Competing  Business  or interest is acquired by the Sellers
      as part of a  larger  acquisition  and the  value  properly
      attributable to the Competing  Business did not at the date
      of acquisition  amount to more than twenty percent (20%) of
      the value of such larger acquisition taken as a whole.

14.3  Without   waiving  the   Purchasers'   rights  to  monetary
      damages,  all  Parties  acknowledge  that the breach of the
      obligations  contained  in Section  14.1 above would result
      in   substantial   but   indeterminable   harm,   that  the
      restraints  imposed  are  reasonable,   that  there  is  no
      adequate  remedy at law for a breach  of such  obligations,
      and
                                       45




      therefore,  that injunctive relief, specific performance or
      other  equitable  remedies are  appropriate  to enforce the
      obligations  undertaken  in Section 14.1. In the event that
      a court  finds  that  the  terms  of this  covenant  not to
      compete are so broad as to be unlawful  and  unenforceable,
      the Parties  further agree that a reformation  of the terms
      of Section 14.1 may be  appropriate in order to protect the
      value  of the  Business  being  conveyed  pursuant  to this
      Agreement  as  a  going  concern,  and  the  value  of  the
      non-competition   covenant,   and  to   provide   for   the
      enforceability  of the  obligations  contained  in  Section
      14.1 to the fullest extent permitted by law.


F.    MISCELLEANOUS


15.   Restriction    of     Announcement,     Cooperation     and
Confidentiality

15.1  Each of the Parties  undertakes that upon execution of this
      Agreement  the  parties  will  make  an   announcement   in
      connection with this Agreement  through prior  consultation
      with the other  Parties,  provided  that the  provisions of
      the  letter  of  Guarantor  dated May 18,  2001,  a copy of
      which is  attached  hereto as Exhibit  15.1,  shall  remain
      unaffected.

15.2  Sellers  shall procure  immediately  after the Closing Date
      the transfer of all patents,  trademarks,  utility  models,
      copyrights  and any  applications  therefor or similar such
      rights owned and /or  registered  in the name of Degussa or
      other  Degussa  group  companies  not being subject of this
      Agreement,  which are  pertaining  to the Business  (herein
      "Degussa-IP  Rights").  Degussa  shall  give all  necessary
      declarations  or shall procure that the  registered  owners
      of such Degussa-IP  Rights give such  declarations in order
      to effect the  transfers of such  Degussa-IP  Rights to the
      Purchasers   or  any  other   corporate   entity  named  by
      Purchasers.  Subsequent to the Signing Date,  Sellers shall
      provide  Purchasers  with such  information  and  access to
      Sellers'  facilities  and records  relating to the Business
      for  transition  planning  and  preparation  and with  such
      assistance as may  reasonably  be requested by  Purchasers,
      including  but  not  limited  to a  list  of  the  Managing
      Directors  and,  to the  Best  of  Sellers  Knowledge,  the
      procurated officers of the Companies,  the location of bank
      accounts   and  lock   boxes  and  a  list  of   authorized
      signatories  on behalf of the  Companies.  Such  assistance
      shall include (i) making employees  available on a mutually
      convenient  basis to  provide  additional  information  and
      explanation  of any material  provided  hereunder  and (ii)
      providing  all  information  necessary  for all filings and
      submissions   to   governmental    authorities   reasonably
      necessary   to  complete   the   transaction   contemplated
      hereunder.

15.3  For  the  purpose  of  this   Agreement,   confidential  or
      proprietary information (herein

                                       46




      "Proprietary  Information")  shall  mean  the  confidential
      business  information  relating  to the  Business  existing
      through the Closing  Date  (herein  "Existing  Confidential
      Information")  and the  information  created,  transferred,
      recorded  or employed  as part of, or  otherwise  resulting
      from the activities  undertaken  pursuant to this Agreement
      or the Schedules and Exhibits hereto which  constitutes the
      confidential,  proprietary  or trade secret  information of
      the disclosing  Party.  Such information may be of, but not
      limited   to,  a   business,   organizational,   technical,
      financial,  marketing,  operational,  regulatory  or  sales
      nature and shall include,  without limitation,  any and all
      source codes and information relating to services,  methods
      of  operation,  price lists,  customer  lists,  technology,
      designs,  specifications or other  proprietary  information
      of the  business  or affairs  of a Party or its  Affiliate.
      Proprietary  Information  may either be in a written  form,
      with notices of its proprietary  nature  affixed,  or in an
      oral form,  reduced to writing and affixed with appropriate
      notice of  proprietary  nature  within  seven  days of oral
      presentation,  and  distributed  to  both  Parties  for the
      matter  of  record,  but  indicated  as such at the time of
      presentation in an oral fashion.

15.4  The  Parties  understand  and  agree  that all  Proprietary
      Information   shall  be   treated  as   confidential.   The
      receiving  Party  shall  use the same  degree of care as it
      uses with  regard  to its own  Proprietary  Information  to
      prevent  disclosure,  use or  publication of the disclosing
      Party's Proprietary  Information.  Proprietary  Information
      of the originating  Party shall be held confidential by the
      receiving Party above unless it is or has been:

      15.4.1 obtained  legally  and  freely  from a  third  party
             without  restriction  as to the  disclosure  of such
             information;

      15.4.2 independently  developed by the receiving Party at a
             prior  time or in a  separate  and  distinct  manner
             without   benefit   of  any   of   the   Proprietary
             Information of the disclosing  Party, and documented
             to be as such;

      15.4.3 made available by the  disclosing  Party for general
             release independent of the receiving Party;

15.4.4     made   public   as   required   by   law,   applicable
             regulations  or court  proceedings or stock exchange
             requirements; or

      15.4.5 within the public  domain or later  becomes  part of
             the  public  domain as a result  of acts by  someone
             other than the receiving  Party and through no fault
             or wrongful act of the receiving Party.

                                       47





15.5  A receiving Party may disclose  Proprietary  Information of
      a disclosing  Party to directors,  officers,  and employees
      of the  receiving  Party or agents of the  receiving  Party
      including  their  respective  brokers,  lenders,  insurance
      carriers or prospective  purchasers  who have  specifically
      agreed  in  writing  to  nondisclosure  of  the  terms  and
      conditions  hereof. Any disclosure hereof required by legal
      process shall only be made after  providing the  disclosing
      Party   with   notice   thereof  in  order  to  permit  the
      disclosing  Party to seek an appropriate  protective  order
      or  exemption.  Violation  by a Party or its  agents of the
      foregoing  provisions  shall entitle the disclosing  Party,
      at its option,  to obtain injunctive relief without showing
      of  irreparable  harm  or  injury  and  without  bond.  The
      provisions  of this Section will be effective  for a period
      of  three (3) years after the Closing Date.

15.6  The  provisions  of  Section  15.4 and  Section  15.5 shall
      apply  only  to  Sellers   with  respect  to  the  Existing
      Confidential Information.


16.   Notices

      All notices  and other  communications  hereunder  shall be
      made  in  writing  and  shall  be   delivered  or  sent  by
      registered  mail or  courier to the  addresses  below or to
      such other  addresses  which may be  specified by any Party
      to the other Parties in the future in writing:


      If to the Sellers, to:

      Degussa AG
      General Counsel
      Bennigsenplatz 1
      D-40474 Dusseldorf
      Germany

      with a copy to:

      Baker & McKenzie
      Dr. Hans-Jorg Ziegenhain
      Neuer Zollhof 3
      D-40221 Dusseldorf
      Germany

                                       48





      If to the Purchasers, to:

      relevant Purchaser

      c/o DENTSPLY International Inc.
      570 West College Avenue
      York, PA 17404, USA
      Attention: Secretary

      with a copy to:

      Mayer, Brown & Platt-Gaedertz
      Mr. Werner Lutzke
      Bockenheimer Landstrasse 98-100
      D - 60323 Frankfurt am Main
      Germany

      If to the Guarantor, to:

      DENTSPLY International Inc.
      570 West College Avenue
      York, PA 17404
      Attention: Secretary

      with a copy to:

      Mayer, Brown & Platt-Gaedertz
      Mr. Werner Lutzke
      Bockenheimer Landstrasse 98-100
      D - 60323 Frankfurt am Main
      Germany


17.   Guarantor's Guarantee

      Guarantor    hereby    unconditionally    and   irrevocably
      guarantees to Sellers the due and punctual  performance  of
      the  payment  of the  Purchase  Price,  including  for  the
      avoidance  of  doubt  the  payment  of any  Purchase  Price
      Adjustment.  The  Guarantor  hereby waives any rights which
      it may  have  to  require  the  Sellers  to  proceed  first
      against  or claim  payment  from  Purchasers  to the extent
      that as between  Sellers and the Guarantor the latter shall
      be liable as principal debtor as if it had entered into

                                       49




      the  undertaking to pay the Purchase  Price,  including for
      the  avoidance  of doubt  the  Purchase  Price  Adjustment,
      jointly and severally with Purchasers.


18.   Miscellaneous

18.1  If  and  to  the  extent  a  conflict  arises  between  the
      contents of this  Agreement and any agreement  entered into
      in  connection  with  this  Agreement  (including,  but not
      limited to,  local share  transfer  agreements  as provided
      for in Section  6.6.2 and 6.6.3  above),  the terms of this
      Agreement shall prevail.

18.2  All expenses,  costs,  fees and charges in connection  with
      the   transactions   contemplated   under  this   Agreement
      including  without  limitation,  legal  services,  shall be
      borne by the Party  commissioning the respective  expenses,
      costs, fees and charges.  All notarial fees incurred by the
      notarization  of this Agreement as well as all fees charged
      by the cartel  authorities  in  connection  with the merger
      clearances  required under this Agreement shall be borne by
      Purchasers.   Purchasers   shall  be  responsible  for  the
      payment of any sales,  transfer  or stamp  taxes,  or other
      similar  charges,  payable  by reason  of the  transactions
      contemplated by this Agreement.

18.3  All Exhibits and Schedules (including,  in particular,  the
      Disclosure  Schedules)  to  this  Agreement  constitute  an
      integral part of this Agreement.

18.4  This  Agreement and the Exhibits and Schedules  referred to
      under  Section  18.3 above  comprise  the entire  agreement
      between the Parties  concerning  the subject  matter hereof
      and   supersede   and   replace   all  oral   and   written
      declarations   of   intention   made  by  the   Parties  in
      connection  with the contractual  negotiations.  Changes or
      amendments to this Agreement  (including this Section 18.4)
      must be made  in  writing  by the  Parties  or in  notarial
      form, if required.

18.5  In  this   Agreement   the   headings   are   inserted  for
      convenience  only and shall not affect  the  interpretation
      of this  Agreement;  where a German term has been  inserted
      in  quotation  marks  and/or  italics it alone (and not the
      English  term to which it relates)  shall be  authoritative
      for  the  purpose  of the  interpretation  of the  relevant
      English term in this Agreement.

18.6  No Party  shall be  entitled to assign any rights or claims
      under this  Agreement  without the  written  consent of the
      other  Parties,  unless  otherwise  specified,  except that
      Purchasers  may  assign its  rights  under this  Agreement,
      including   its  rights  to  purchase  the  shares,   to  a
      wholly-owned   subsidiary   pursuant   to   an   assumption
      agreement reasonably acceptable to Sellers.

                                       50





18.7  Interest  payable  under any  provision  of this  Agreement
      shall be  calculated  on the basis of actual  days  elapsed
      divided by 360 and shall exclude the day of payment.

18.8  "Business  Days"  (Werktage)  referred to in this Agreement
      shall be any day other than  Sunday or public  holidays  in
      Frankfurt am Main.

18.9  This  Agreement  shall not grant any  rights to, and is not
      intended  to operate  for,  the  benefit  of third  parties
      unless otherwise explicitly provided for herein.

18.10 No Party,  except as provided  otherwise  herein,  shall be
      entitled (i) to set-off
      (aufrechnen)  any rights and claims it may have against any
      rights  or  claims  any other  Party  may have  under  this
      Agreement,  or (ii) to refuse to perform any  obligation it
      may have under this  Agreement on the grounds that it has a
      right  of  retention   (Zuruckbehaltungsrecht)  unless  the
      rights or claims of the relevant  Party claiming a right of
      set-off (Aufrechnung) or retention  (Zuruckbehaltung)  have
      been  acknowledged  (anerkannt)  in writing by the relevant
      other   Party/Parties  or  have  been  confirmed  by  final
      decision  of a competent  court  (Gericht)  or  arbitration
      court (Schiedsgericht).

18.11 Any  currency   conversions   shall  be  determined   using
      prevailing  exchange  rates  prevailing two banking days in
      Frankfurt   am  Main   prior  to  the  date  on  which  the
      respective  payments  become due and payable.  The European
      Central   Bank  fixing   rates  shall  be  used  which  are
      published both by electronic market  information  providers
      (e.g.   Reuters  page  ECB37)  and  on  the  ECB's  website
      www.ecb.int  shortly  after 2.15 p.m.  CET. When such rates
      are not  available on such date,  Reuters  world spot rates
      (mid rate on page FX=) taken as close as  possible  to 2.15
      p.m. CET shall be used.

18.12 This  Agreement  shall be governed  by, and be construed in
      accordance  with,  the  laws  of the  Federal  Republic  of
      Germany,  without  regard to  principles  of  conflicts  of
      laws.  All  disputes   arising  in  connection   with  this
      Agreement  or its  validity  shall be  finally  settled  by
      three  arbitrators in accordance with the Arbitration Rules
      of  the  German   Institution  of  Arbitration  e.V.  (DIS)
      without  recourse to the ordinary  courts of law. The venue
      of  the  arbitration   shall  be  Frankfurt  am  Main.  The
      language of the arbitral proceedings shall be English.

18.13 In the event that one or more  provisions of this Agreement
      shall, or shall be deemed to, be invalid or  unenforceable,
      the validity and  enforceability of the other provisions of
      this  Agreement  shall  not be  affected  thereby.  In such
      case,  the  Parties  hereto  agree  to  recognize  and give
      effect  to  such  valid  and   enforceable   provision   or
      provisions  which  correspond  as closely as possible  with
      the commercial intent of

                                       51




      the  Parties.  The same shall  apply in the event that this
      Agreement contains any gaps (Vertragslucken).

18.14 This  Agreement is subject to the condition  precedent that
      Degussa shall not notify the undersigned  notary in writing
      by fax by  Tuesday  May  29,  2001  24:00  hours  that  the
      supervisory   board   (Aufsichtsrat)  of  Degussa  has  not
      approved  this  Agreement.  The  undersigned  notary  shall
      confirm to the Parties  without  undue delay whether or not
      he has received such notice from  Degussa.  The original of
      the   notification   from  Degussa   containing   notarised
      signature and notarial  confirmation of power shall be sent
      to the undersigned notary immediately by courier service.
                                         (continued on next page)

                                       52