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                                                                  Execution Copy

                       CABOT MICROELECTRONICS CORPORATION

                                4,000,000 SHARES

                                  COMMON STOCK
                          (par value $0.001 per share)



                             UNDERWRITING AGREEMENT

                                                                  April __, 2000

Goldman, Sachs & Co.,
Merrill Lynch, Pierce, Fenner & Smith
            Incorporated,
FleetBoston Robertson Stephens Inc.,
   As representatives of the several Underwriters
     named in Schedule I hereto,
c/o Goldman, Sachs & Co.,
85 Broad Street,
New York, New York 10004.

Ladies and Gentlemen:

         Cabot Microelectronics Corporation, a Delaware corporation (the
"Company"), and a wholly owned subsidiary of Cabot Corporation ("Cabot
Corporation"), proposes, subject to the terms and conditions stated herein, to
issue and sell to the Underwriters named in Schedule I hereto (the
"Underwriters") an aggregate of 4,000,000 shares (the "Firm Shares") and, at the
election of the Underwriters, up to 600,000 additional shares (the "Optional
Shares") of common stock, par value $0.001 per share (the "Stock"), of the
Company (the Firm Shares and the Optional Shares that the Underwriters elect to
purchase pursuant to Section 2 hereof being collectively called the "Shares").

         1. Each of the Company and Cabot Corporation jointly and severally
represents and warrants to, and agrees with, each of the Underwriters that:

                  (a) A registration statement on Form S-1 (File No. 333-95093)
         (the "Initial Registration Statement") in respect of the Shares has
         been filed with the Securities and Exchange Commission (the
         "Commission"); the Initial Registration Statement and any
         post-effective amendment thereto, each in the form heretofore delivered
         to you, and, excluding exhibits thereto, to you for each of the other
         Underwriters, have been declared effective by the Commission in such
         form; other than a registration statement, if any, increasing the size
         of the offering (a "Rule 462(b) Registration Statement"), filed
         pursuant to Rule 462(b) under the Securities Act of 1933, as amended
         (the "Act"), which became effective upon filing, no other
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         document with respect to the Initial Registration Statement has
         heretofore been filed with the Commission; and no stop order suspending
         the effectiveness of the Initial Registration Statement, any
         post-effective amendment thereto or the Rule 462(b) Registration
         Statement, if any, has been issued and no proceeding for that purpose
         has been initiated or threatened by the Commission (any preliminary
         prospectus included in the Initial Registration Statement or filed with
         the Commission pursuant to Rule 424(a) of the rules and regulations of
         the Commission under the Act is hereinafter called a "Preliminary
         Prospectus"; the various parts of the Initial Registration Statement
         and the Rule 462(b) Registration Statement, if any, including all
         exhibits thereto and including the information contained in the form of
         final prospectus filed with the Commission pursuant to Rule 424(b)
         under the Act in accordance with Section 5(a) hereof and deemed by
         virtue of Rule 430A under the Act to be part of the Initial
         Registration Statement at the time it was declared effective, each as
         amended at the time such part of the Initial Registration Statement
         became effective or such part of the Rule 462(b) Registration
         Statement, if any, became or hereafter becomes effective, are
         hereinafter collectively called the "Registration Statement"; and such
         final prospectus, in the form first filed pursuant to Rule 424(b) under
         the Act, is hereinafter called the "Prospectus");

                  (b) No order preventing or suspending the use of any
         Preliminary Prospectus has been issued by the Commission, and each
         Preliminary Prospectus, at the time of filing thereof, conformed in all
         material respects to the requirements of the Act and the rules and
         regulations of the Commission thereunder, and did not contain an untrue
         statement of a material fact or omit to state a material fact required
         to be stated therein or necessary to make the statements therein, in
         the light of the circumstances under which they were made, not
         misleading; provided, however, that this representation and warranty
         shall not apply to any statements or omissions made in reliance upon
         and in conformity with information furnished in writing to the Company
         by an Underwriter through Goldman, Sachs & Co. expressly for use
         therein;

                  (c) The Registration Statement conforms, and the Prospectus
         and any further amendments or supplements to the Registration Statement
         or the Prospectus will conform, in all material respects to the
         requirements of the Act and the rules and regulations of the Commission
         thereunder and do not and will not, as of the applicable effective date
         as to the Registration Statement and any amendment thereto, and as of
         the applicable filing date as to the Prospectus and any amendment or
         supplement thereto, contain an untrue statement of a material fact or
         omit to state a material fact required to be stated therein or
         necessary to make the statements therein not misleading; provided,
         however, that this representation and warranty shall not apply to any
         statements or omissions made in reliance upon and in conformity with
         information furnished in writing to the Company by an Underwriter
         through Goldman, Sachs & Co. expressly for use therein;

                  (d) The Company has not sustained since the date of the latest
         audited financial statements included in the Prospectus any material
         loss or interference with its business from fire, explosion, flood or
         other calamity, whether or not covered by insurance, or from any labor
         dispute or court or governmental action, order or decree, otherwise
         than as set forth or contemplated in the Prospectus; and, since the
         respective dates as of which information is given in the Registration
         Statement and the Prospectus, there has not been any change in the
         capital stock or long-term debt of the Company or any material adverse
         change, or any development involving a prospective material adverse
         change, in or affecting the general affairs, management, financial
         position, stockholders' equity or results of operations of the Company,
         otherwise than as set forth or contemplated in the Prospectus;


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                  (e) Except for the restrictions arising out of its purchase of
         the property underlying its plant in Geino, Japan from the Japanese
         government, the Company has (except for the Geino, Japan plant as to
         which the Company and Cabot Corporation and its subsidiaries
         collectively have) good and marketable title in fee simple to all real
         property and good and marketable title to all personal property owned
         by it, in each case free and clear of all liens, encumbrances and
         defects except such as are described in the Prospectus or such as would
         not, individually or in the aggregate, have a materially adverse effect
         on the business, condition (financial or otherwise) stockholders'
         equity, prospects or results of operations of the Company (a "Material
         Adverse Effect"); and any real property and buildings held under lease
         by the Company are held by it under valid, subsisting and enforceable
         leases with such exceptions as have not had and would not have,
         individually or in the aggregate, a Material Adverse Effect;

                  (f) The Company has been duly incorporated and is validly
         existing as a corporation in good standing under the laws of the State
         of Delaware, with power and authority (corporate and other) to own its
         properties and conduct its business as described in the Prospectus, and
         has been duly qualified as a foreign corporation for the transaction of
         business and is in good standing under the laws of each other
         jurisdiction in which it owns or leases properties or conducts any
         business so as to require such qualification, other than where the
         failure to be so qualified or in good standing has not had and would
         not have, individually or in the aggregate, a Material Adverse Effect;

                  (g) The Company has an authorized capitalization as set forth
         in the Prospectus, and all of the issued shares of capital stock of the
         Company have been duly and validly authorized and issued, are fully
         paid and non-assessable and conform in all material respects to the
         description of the Stock contained in the Prospectus;

                  (h) The Shares have been duly and validly authorized and, when
         issued and delivered against payment therefor as provided herein, will
         be duly and validly issued and fully paid and non-assessable and will
         conform to the description of the Stock contained in the Prospectus;

                  (i) The issue and sale of the Shares by the Company and the
         compliance by the Company with all of the provisions of this Agreement
         and the consummation of the transactions herein contemplated will not
         conflict with or result in a breach or violation of any of the terms or
         provisions of, or constitute a default under, any indenture, mortgage,
         deed of trust, loan agreement or other agreement or instrument to which
         the Company is a party or by which the Company is bound or to which any
         of the property or assets of the Company is subject other than any such
         conflicts, breaches, violations or defaults that, individually or in
         the aggregate, would not be reasonably likely to have a Material
         Adverse Effect, nor will such action result in any violation of the
         provisions of the Certificate of Incorporation or By-laws of the
         Company or any statute or any order, rule or regulation of any court or
         governmental agency or body having jurisdiction over the Company or any
         of its properties; and no consent, approval, authorization, order,
         registration or qualification of or with any such court or governmental
         agency or body is required for the issue and sale of the Shares or the
         consummation by the Company of the transactions contemplated by this
         Agreement, except the registration under the Act of the Shares and such
         consents, approvals, authorizations, registrations or qualifications as
         may be required under state securities or Blue Sky laws in connection
         with the purchase and distribution of the Shares by the Underwriters;

                  (j) The Company is not (A) in violation of its Certificate of
         Incorporation or By-laws or (B) in default in the performance or
         observance of any material obligation, agreement,


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         covenant or condition contained in any indenture, mortgage, deed of
         trust, loan agreement, lease or other agreement or instrument to which
         it is a party or by which it or any of its properties may be bound,
         except, in the case of clause (B) only, for any such defaults that,
         individually or in the aggregate, have not had and are not likely to
         have a Material Adverse Effect;

                  (k) The statements set forth in the Prospectus under the
         caption "Description of Capital Stock", insofar as they purport to
         constitute a summary of the terms of the Stock and under the caption
         "Underwriting", insofar as they purport to describe the provisions of
         the laws and documents referred to therein, are accurate, complete and
         fair in all material respects;

                  (l) Other than as set forth in the Prospectus, there are no
         legal or governmental proceedings pending to which the Company is a
         party or of which any property of the Company is the subject which, if
         determined adversely to the Company, would individually or in the
         aggregate have a Material Adverse Effect; and, to the best of the
         Company's knowledge, no such proceedings are threatened or contemplated
         by governmental authorities or threatened by others;

                  (m) Other than as set forth in the Prospectus, the Company
         owns or possesses, or can acquire on reasonable terms, adequate
         patents, patent rights, licenses, inventions, copyrights, know-how
         (including trade secrets and other unpatented and/or unpatentable
         proprietary or confidential information, systems of procedures),
         trademarks, service marks, trade names or other intellectual property
         (collectively, "Intellectual Property") necessary to carry on the
         business now operated by it, and the Company has not received any
         notice or is otherwise aware of any infringement of or conflict with
         asserted rights of others with respect to any Intellectual Property or
         of any facts or circumstances which would render any Intellectual
         Property invalid or inadequate to protect the interest of the Company
         therein, and which infringement, conflict, invalidity, individually, or
         in the aggregate, is subject of any unfavorable decision, ruling or
         finding;

                  (n) The Company is not, and after giving effect to the
         offering and sale of the Shares will not be, an "investment company",
         as such term is defined in the Investment Company Act of 1940, as
         amended (the "Investment Company Act");

                  (o) Each of the agreements between the Company and Cabot
         Corporation that are referred to in the Prospectus and listed forth in
         Schedule I hereto (collectively, the "Inter-Company Agreements") have
         been duly and validly authorized by all necessary corporate action on
         the part of the Company and Cabot Corporation. The Inter-Company
         Agreements have been duly executed and delivered by each of the Company
         and Cabot Corporation and constitute valid and binding obligations of
         the Company and Cabot Corporation, enforceable against the parties in
         accordance with their respective terms;

                (p) Prior to the First Time of Delivery (as defined in Section 4
         hereof), Cabot Corporation will have transferred to the Company
         substantially all of the assets and liabilities previously used by it
         to conduct the businesses of its Microelectronics Materials Division as
         described in the Registration Statement (except for the fumed alumina
         plant at Cabot Corporation's Tuscola, Illinois facility and the land,
         building and other improvements and fixtures in Barry, Wales and any
         other assets and liabilities that Cabot Corporation requires to provide
         the services to the Company pursuant to the Inter-Company Agreements
         and which may have been recorded or deemed to have been on the books of
         the Microelectronics Materials Division) and as a result of these
         transfers and the Inter-Company Agreements the


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         Company will be able to conduct such businesses in substantially the
         same manner and to the same extent as they were conducted by the
         Microelectronics Materials Division of Cabot Corporation prior to such
         transfers (except to the extent that that conduct of such businesses
         require the ownership of the assets or assumption of the liabilities
         referred to in the previous parenthetical in this paragraph (p)); and

                (q) PricewaterhouseCoopers LLP, who have certified certain
         financial statements of the Company, are independent public accountants
         as required by the Act and the rules and regulations of the Commission
         thereunder.

         2. Subject to the terms and conditions herein set forth, (a) the
Company agrees to issue and sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Company, at
a purchase price per share of $................, the number of Firm Shares set
forth opposite the name of such Underwriter in Schedule II hereto and (b) in the
event and to the extent that the Underwriters shall exercise the election to
purchase Optional Shares as provided below, the Company agrees to issue and sell
to each of the Underwriters, and each of the Underwriters agrees, severally and
not jointly, to purchase from the Company, at the purchase price per share set
forth in clause (a) of this Section 2, that portion of the number of Optional
Shares as to which such election shall have been exercised (to be adjusted by
you so as to eliminate fractional shares) determined by multiplying such number
of Optional Shares by a fraction, the numerator of which is the maximum number
of Optional Shares which such Underwriter is entitled to purchase as set forth
opposite the name of such Underwriter in Schedule II hereto and the denominator
of which is the maximum number of Optional Shares that all of the Underwriters
are entitled to purchase hereunder.

         The Company hereby grants to the Underwriters the right to purchase at
their election up to 600,000 Optional Shares, at the purchase price per share
set forth in the paragraph above, for the sole purpose of covering sales of
shares in excess of the number of Firm Shares. Any such election to purchase
Optional Shares may be exercised only by written notice from Goldman, Sachs &
Co. to the Company, given within a period of 30 calendar days after the date of
this Agreement, setting forth the aggregate number of Optional Shares to be
purchased and the date on which such Optional Shares are to be delivered, as
determined by you but in no event earlier than the First Time of Delivery (as
defined in Section 4 hereof) or, unless you and the Company otherwise agree in
writing, earlier than two or later than ten business days after the date of such
notice.

         3. Upon the authorization by you of the release of the Firm Shares, the
several Underwriters propose to offer the Firm Shares for sale upon the terms
and conditions set forth in the Prospectus.

         4. (a) The Shares to be purchased by each Underwriter hereunder, in
definitive form, and in such authorized denominations and registered in such
names as Goldman, Sachs & Co. may request upon at least forty-eight hours' prior
notice to the Company shall be delivered by or on behalf of the Company to
Goldman, Sachs & Co., through the facilities of the Depository Trust Company
("DTC"), for the account of such Underwriter, against payment by or on behalf of
such Underwriter of the purchase price therefor by wire transfer of Federal
(same-day) funds to the account specified by the Company to Goldman, Sachs & Co.
at least forty-eight hours in advance. The Company will cause the certificates
representing the Shares to be made available for checking and packaging at least
twenty-four hours prior to the Time of Delivery (as defined below) with respect
thereto at the office of DTC or its designated custodian (the "Designated
Office"). The time and date of such delivery and payment shall be, with respect
to the Firm Shares, 9:30 a.m., New York City time, on ............., 2000 or
such other time and date as Goldman, Sachs & Co. and the Company may agree upon
in writing,


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and, with respect to the Optional Shares, 9:30 a.m., New York time, on the date
specified by Goldman, Sachs & Co. in the written notice given by Goldman, Sachs
& Co. of the Underwriters' election to purchase such Optional Shares, or such
other time and date as Goldman, Sachs & Co. and the Company may agree upon in
writing. Such time and date for delivery of the Firm Shares is herein called the
"First Time of Delivery", such time and date for delivery of the Optional
Shares, if not the First Time of Delivery, is herein called the "Second Time of
Delivery", and each such time and date for delivery is herein called a "Time of
Delivery".

                (b) The documents to be delivered at each Time of Delivery by or
on behalf of the parties hereto pursuant to Section 7 hereof, including the
cross receipt for the Shares and any additional documents requested by the
Underwriters pursuant to Section 7(j) hereof, will be delivered at the offices
of Sullivan & Cromwell, 125 Broad Street, New York, New York 10004 (the "Closing
Location"), and the Shares will be delivered at the Designated Office, all at
such Time of Delivery. A meeting will be held at the Closing Location at 2:00
p.m., New York City time, on the New York Business Day next preceding such Time
of Delivery, at which meeting the final drafts of the documents to be delivered
pursuant to the preceding sentence will be available for review by the parties
hereto. For the purposes of this Section 4, "New York Business Day" shall mean
each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which
banking institutions in New York are generally authorized or obligated by law or
executive order to close.

         5. The Company agrees with each of the Underwriters as follows and
Cabot Corporation agrees with each of the Underwriters as set forth in Section
5(e) and to cause the Company to comply with its obligations under this Section
5:

               (a) To prepare the Prospectus in a form approved by you and to
         file such Prospectus pursuant to Rule 424(b) under the Act not later
         than the Commission's close of business on the second business day
         following the execution and delivery of this Agreement, or, if
         applicable, such earlier time as may be required by Rule 430A(a)(3)
         under the Act; to make no further amendment or any supplement to the
         Registration Statement or Prospectus which shall be disapproved by you
         promptly after reasonable notice thereof; to advise you, promptly after
         it receives notice thereof, of the time when any amendment to the
         Registration Statement has been filed or becomes effective or any
         supplement to the Prospectus or any amended Prospectus has been filed
         and to furnish you with copies thereof; to advise you, promptly after
         it receives notice thereof, of the issuance by the Commission of any
         stop order or of any order preventing or suspending the use of any
         Preliminary Prospectus or prospectus, of the suspension of the
         qualification of the Shares for offering or sale in any jurisdiction,
         of the initiation or threatening of any proceeding for any such
         purpose, or of any request by the Commission for the amending or
         supplementing of the Registration Statement or Prospectus or for
         additional information; and, in the event of the issuance of any stop
         order or of any order preventing or suspending the use of any
         Preliminary Prospectus or prospectus or suspending any such
         qualification, promptly to use its best efforts to obtain the
         withdrawal of such order;

               (b) Promptly from time to time to take such action as you may
         reasonably request to qualify the Shares for offering and sale under
         the securities laws of such jurisdictions as you may request and to
         comply with such laws so as to permit the continuance of sales and
         dealings therein in such jurisdictions for as long as may be necessary
         to complete the distribution of the Shares, provided that in connection
         therewith the Company shall not be required to qualify as a foreign
         corporation or to file a general consent to service of process in any
         jurisdiction;


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               (c) Prior to 10:00 A.M., New York City time, on the New York
         Business Day next succeeding the date of this Agreement and from time
         to time, to furnish the Underwriters with copies of the Prospectus in
         New York City in such quantities as you may reasonably request, and, if
         the delivery of a prospectus is required at any time prior to the
         expiration of nine months after the time of issue of the Prospectus in
         connection with the offering or sale of the Shares and if at such time
         any event shall have occurred as a result of which the Prospectus as
         then amended or supplemented would include an untrue statement of a
         material fact or omit to state any material fact necessary in order to
         make the statements therein, in the light of the circumstances under
         which they were made when such Prospectus is delivered, not misleading,
         or, if for any other reason it shall be necessary during such period to
         amend or supplement the Prospectus in order to comply with the Act, to
         notify you and upon your request to prepare and furnish without charge
         to each Underwriter and to any dealer in securities as many copies as
         you may from time to time reasonably request of an amended Prospectus
         or a supplement to the Prospectus which will correct such statement or
         omission or effect such compliance, and in case any Underwriter is
         required to deliver a prospectus in connection with sales of any of the
         Shares at any time nine months or more after the time of issue of the
         Prospectus, upon your request but at the expense of such Underwriter,
         to prepare and deliver to such Underwriter as many copies as you may
         request of an amended or supplemented Prospectus complying with Section
         10(a)(3) of the Act;

               (d) To make generally available to its securityholders as soon as
         practicable, but in any event not later than eighteen months after the
         effective date of the Registration Statement (as defined in Rule 158(c)
         under the Act), an earnings statement of the Company (which need not be
         audited) complying with Section 11(a) of the Act and the rules and
         regulations thereunder (including, at the option of the Company, Rule
         158);

               (e) Neither the Company nor Cabot Corporation will, during the
         period beginning from the date hereof and continuing to and including
         the date 180 days after the date of the Prospectus, offer, sell,
         contract to sell or otherwise dispose of, except as provided hereunder
         any securities of the Company that are substantially similar to the
         Shares, including but not limited to any securities that are
         convertible into or exchangeable for, or that represent the right to
         receive, Stock or any such substantially similar securities (other than
         pursuant to employee stock option plans and other benefits plans
         described in the Prospectus and existing on the date of this Agreement
         but subject to the limitations contained therein as of such date),
         without your prior written consent;

               (f) To furnish to its stockholders as soon as practicable after
         the end of each fiscal year an annual report (including a balance sheet
         and statements of income, stockholders' equity and cash flows of the
         Company certified by independent public accountants) and, as soon as
         practicable after the end of each of the first three quarters of each
         fiscal year (beginning with the fiscal quarter ending after the
         effective date of the Registration Statement), to make available to its
         stockholders consolidated summary financial information of the Company
         for such quarter in reasonable detail;

               (g) During a period of three years from the effective date of the
         Registration Statement, to furnish to you copies of all reports or
         other communications (financial or other) furnished to stockholders,
         and to deliver to you (i) as soon as they are available, copies of any
         reports and financial statements furnished to or filed with the
         Commission or any national securities exchange on which any class of
         securities of the Company is listed; and (ii) such additional
         information concerning the business and financial condition of the
         Company as you may from


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         time to time reasonably request (such financial statements to be on a
         consolidated basis to the extent the accounts of the Company are
         consolidated in reports furnished to its stockholders generally or to
         the Commission);

               (h) To use the net proceeds received by it from the sale of the
         Shares pursuant to this Agreement in the manner specified in the
         Prospectus under the caption "Use of Proceeds";

               (i) To use its best efforts to list for quotation the Shares on
         the Nasdaq National Market System ("Nasdaq");

               (j) To file with the Commission such information on Form 10-Q or
         Form 10-K as may be required by Rule 463 under the Act; and

               (k) If the Company elects to rely upon Rule 462(b), the Company
         shall file a Rule 462(b) Registration Statement with the Commission in
         compliance with Rule 462(b) by 10:00 P.M., Washington, D.C. time, on
         the date of this Agreement, and the Company shall at the time of filing
         either pay to the Commission the filing fee for the Rule 462(b)
         Registration Statement or give irrevocable instructions for the payment
         of such fee pursuant to Rule 111(b) under the Act.

         6. Each of the Company and Cabot Corporation jointly and severally
covenants and agrees with the several Underwriters that the Company will pay or
cause to be paid the following: (i) the fees, disbursements and expenses of the
Company's counsel and accountants in connection with the registration of the
Shares under the Act and all other expenses in connection with the preparation,
printing and filing of the Registration Statement, any Preliminary Prospectus
and the Prospectus and amendments and supplements thereto and the mailing and
delivering of copies thereof to the Underwriters and dealers; (ii) the cost of
printing or producing any Agreement among Underwriters, this Agreement, the Blue
Sky Memorandum, closing documents (including any compilations thereof) and any
other documents in connection with the offering, purchase, sale and delivery of
the Shares; (iii) all expenses in connection with the qualification of the
Shares for offering and sale under state securities laws as provided in Section
5(b) hereof, including the reasonable fees and disbursements of counsel for the
Underwriters in connection with such qualification and in connection with the
Blue Sky survey; (iv) all fees and expenses in connection with listing the
Shares on the Nasdaq; (v) the filing fees incident to, and the reasonable fees
and disbursements of counsel for the Underwriters in connection with, securing
any required review by the National Association of Securities Dealers, Inc. of
the terms of the sale of the Shares; (vi) the cost of preparing stock
certificates; (vii) the cost and charges of any transfer agent or registrar; and
(viii) all other costs and expenses incident to the performance of its
obligations hereunder which are not otherwise specifically provided for in this
Section. It is understood, however, that, except as provided in this Section,
and Sections 8 and 11 hereof, the Underwriters will pay all of their own costs
and expenses, including the fees of their counsel, stock transfer taxes on
resale of any of the Shares by them, and any advertising expenses connected with
any offers they may make.

         7. The obligations of the Underwriters hereunder, as to the Shares to
be delivered at each Time of Delivery, shall be subject, in their discretion, to
the condition that all representations and warranties and other statements of
each of the Company and of Cabot Corporation herein are, at and as of such Time
of Delivery, true and correct, the condition that each of the Company and Cabot
Corporation shall have performed all of its obligations hereunder theretofore to
be performed, and the following additional conditions:

               (a) The Prospectus shall have been filed with the Commission
         pursuant to Rule 424(b) within the applicable time period prescribed
         for such filing by the rules and regulations under


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         the Act and in accordance with Section 5(a) hereof; if the Company has
         elected to rely upon Rule 462(b), the Rule 462(b) Registration
         Statement shall have become effective by 10:00 P.M., Washington, D.C.
         time, on the date of this Agreement; no stop order suspending the
         effectiveness of the Registration Statement or any part thereof shall
         have been issued and no proceeding for that purpose shall have been
         initiated or threatened by the Commission; and all requests for
         additional information on the part of the Commission shall have been
         complied with to your reasonable satisfaction;

               (b) Sullivan & Cromwell, counsel for the Underwriters, shall have
         furnished to you such written opinion or opinions dated such Time of
         Delivery, with respect to such matters as you may reasonably request,
         and such counsel shall have received such papers and information as
         they may reasonably request to enable them to pass upon such matters;

               (c) Fried, Frank, Harris, Shriver & Jacobson, counsel for the
         Company, shall have furnished to you their written opinion dated such
         Time of Delivery, in form and substance satisfactory to you, to the
         effect that:

                         (i) The Company has been duly incorporated and is an
                    existing corporation in good standing under the laws of the
                    State of Delaware, with corporate power and authority to own
                    its properties and conduct its business as described in the
                    Prospectus;

                         (ii) The Company has an authorized capitalization as
                    set forth in the Prospectus in the second paragraph under
                    the caption "Description of Capital Stock"; all of the
                    issued and outstanding shares of Stock have been duly
                    authorized, validly issued and are fully paid and
                    non-assessable; and the Shares will, upon issuance and
                    delivery and payment therefor in the manner described in
                    this Agreement, be duly authorized, validly issued and fully
                    paid and non-assessable;

                         (iii) This Agreement has been duly authorized, executed
                    and delivered by each of the Company and Cabot Corporation;

                         (iv) The issue and sale of the Shares being delivered
                    at such Time of Delivery by the Company and the compliance
                    by the Company with all of the provisions of this Agreement
                    and the consummation of the transactions herein contemplated
                    will not result in any violation of the provisions of the
                    Certificate of Incorporation or By-laws of the Company or
                    any statute or any order, rule or regulation known to such
                    counsel of any court or governmental agency or body having
                    jurisdiction over the Company or any of its properties;

                         (v) No consent, approval, authorization or order of,
                    registration or filing with, any such court or governmental
                    agency or body of the United States of America or the States
                    of New York or Delaware (as it relates to the General
                    Corporation Law of the State of Delaware) applicable to the
                    Company is required on the part of the Company for the
                    issuance and sale of the Shares by the Company and the
                    consummation by the Company of the transaction contemplated
                    by this Agreement, except for (i) the registration under the
                    Act of the Shares, (ii) such consents, approvals,
                    authorizations, registrations or qualifications as may be
                    required under state securities or Blue Sky laws in
                    connection with the purchase and distribution of the Shares
                    by the Underwriters and (iii) the filing with the Secretary
                    of State of the State of Delaware, and the effectiveness of,
                    the Company's Amended and Restated


                                       9
   10
                    Certificate of Incorporation and the Certificate of
                    Designation, Preferences and Rights in respect of Series A
                    Junior Participating Preferred Stock;

                          (vi) The statements set forth in the Prospectus under
                    the caption "Description of Capital Stock", insofar as they
                    purport to constitute a summary of the terms of the Stock
                    and under the caption "Underwriting", insofar as they
                    purport to describe the provisions of the laws and documents
                    referred to therein, are accurate, and complete in all
                    material respects;

                         (vii) The Company is not an "investment company", as
                    defined in the Investment Company Act;

                         (viii)The Registration Statement, at the time it was
                    declared effective by the Commission, and the Prospectus, as
                    of its date, (except for the financial statements, notes and
                    schedules thereto and other financial information and data,
                    as to which such counsel does not express any opinion)
                    appeared on their face to be responsive in all material
                    respects with the requirements of the Act and Rules and
                    Regulation thereunder; and

                         (ix) Such counsel shall state that in the course of the
                    preparation of the Registration Statement and the
                    Prospectus, such counsel participated in conferences with
                    certain of the officers and representatives of, and the
                    independent public accountants for, the Company, at which
                    the Registration Statement and the Prospectus were
                    discussed. Such counsel shall state that between the date of
                    effectiveness of the Registration Statement and the time of
                    delivery of their opinion, they held additional conferences
                    with certain officers and representatives of, and the
                    independent public accountants for, the Company, at which
                    the contents of the Prospectus were discussed to a limited
                    extent. Such counsel may state that given the limitations
                    inherent in the independent verification of factual matters
                    and the character of determinations involved in the
                    registration process, they are not passing upon or assuming
                    any responsibility for the accuracy, completeness or
                    fairness of the statements contained in the Registration
                    Statement of the Prospectus except as provided in clause
                    (vi) above. Such counsel shall state that subject to the
                    foregoing and on the basis of the information they obtained
                    in performance of the services referred to above, including
                    information they obtained from officers and other
                    representatives of, and the independent public accountants
                    for, the Company, no facts have come to their attention that
                    cause them to believe that the Registration Statement, at
                    the time the Registration Statement became effective,
                    contained any untrue statement of a material fact or omitted
                    to state a material fact required to be stated therein or
                    necessary in order to make the statements therein not
                    misleading or that the Prospectus, as of its date, contained
                    any untrue statement of a material fact or omitted to state
                    a material fact necessary in order to make the statements
                    therein, in light of the circumstances under which they were
                    made, not misleading. Also, subject to the foregoing, no
                    facts have come to their attention in the course of
                    proceedings described in the second sentence of this
                    paragraph that cause them to believe that the Prospectus, as
                    of the date and time of delivery of this opinion, contains
                    an untrue statement of a material fact or omits to state a
                    material fact required to be stated therein or necessary in
                    order to make the statements therein, in light of the
                    circumstances in which they were made, not misleading. Such
                    counsel shall also state that they express no view or
                    belief, however, with respect to the


                                       10
   11
                  financial statements, notes and schedules thereto and other
                  financial information and data included in or omitted from the
                  Registration Statement or Prospectus; and

                           (x) The Company has been duly qualified as a foreign
                  corporation for the transaction of business and is in good
                  standing under the laws of each of state listed in a schedule
                  to such opinion.

                  (d) Robert Rothberg, general counsel of Cabot Corporation,
         shall have furnished to you his opinion dated such Time of Delivery, in
         form and substance satisfactory to you, to the effect that:

                           (i) To the best of such counsel's knowledge and other
                  than as set forth in the Prospectus, there are no legal or
                  governmental proceedings pending to which the Company is a
                  party or of which any property of the Company is the subject
                  which, if determined adversely to the Company, would
                  individually or in the aggregate have a Material Adverse
                  Effect; and, to the best of such counsel's knowledge, no such
                  proceedings are threatened or contemplated by governmental
                  authorities or threatened by others;

                           (ii) To the best of such counsel's knowledge, the
                  issue and sale of the Shares being delivered at such Time of
                  Delivery by the Company and the compliance by the Company with
                  all of the provisions of this Agreement and the consummation
                  of the transactions herein contemplated will not conflict with
                  or result in a breach or violation of any of the terms or
                  provisions of, or constitute a default under, any indenture,
                  mortgage, deed of trust, loan agreement or other agreement or
                  instrument to which the Company is a party or by which the
                  Company is bound or to which any of the property or assets of
                  the Company is subject; and

                           (iii) The Company is not in violation of its
                  Certificate of Incorporation or By-laws.

                  (e) On the date of the Prospectus at a time prior to the
         execution of this Agreement, at 9:30 a.m., New York City time, on the
         effective date of any post-effective amendment to the Registration
         Statement filed subsequent to the date of this Agreement and also at
         each Time of Delivery, PricewaterhouseCoopers LLP shall have furnished
         to you a letter or letters, dated the respective dates of delivery
         thereof, in form and substance satisfactory to you, to the effect set
         forth in Annex I hereto (the executed copy of the letter delivered
         prior to the execution of this Agreement is attached as Annex I(a)
         hereto and a draft of the form of letter to be delivered on the
         effective date of any post-effective amendment to the Registration
         Statement and as of each Time of Delivery is attached as Annex I(b)
         hereto);

                  (f) (i) The Company shall have not sustained since the date of
         the latest audited financial statements included in the Prospectus any
         loss or interference with its business from fire, explosion, flood or
         other calamity, whether or not covered by insurance, or from any labor
         dispute or court or governmental action, order or decree, otherwise
         than as set forth or contemplated in the Prospectus, and (ii) since the
         respective dates as of which information is given in the Prospectus
         there shall not have been any change in the capital stock or long-term
         debt of the Company or any change, or any development involving a
         prospective change, in or affecting the general affairs, management,
         financial position, stockholders' equity or results of operations of
         the Company, otherwise than as set forth or contemplated in the
         Prospectus, the effect of which, in any such case described in clause
         (i) or (ii), is in the judgment of the Representatives so material and
         adverse as to make it impracticable or inadvisable to proceed


                                       11
   12
         with the public offering or the delivery of the Shares being delivered
         at such Time of Delivery on the terms and in the manner contemplated in
         the Prospectus;

               (g) On or after the date hereof there shall not have occurred any
         of the following: (i) a suspension or material limitation in trading in
         securities generally on the New York Stock Exchange or on Nasdaq; (ii)
         a suspension or material limitation in trading in the Company's
         securities on Nasdaq; (iii) a general moratorium on commercial banking
         activities declared by either Federal or New York State authorities; or
         (iv) the outbreak or escalation of hostilities involving the United
         States or the declaration by the United States of a national emergency
         or war, if the effect of any such event specified in this clause (iv)
         in the judgment of the Representatives makes it impracticable or
         inadvisable to proceed with the public offering or the delivery of the
         Shares being delivered at such Time of Delivery on the terms and in the
         manner contemplated in the Prospectus;

               (h) The Shares to be sold at such Time of Delivery shall have
         been duly listed for quotation on Nasdaq;

               (i) The Company shall have complied with the provisions of
         Section 5(c) hereof with respect to the furnishing of prospectuses on
         the New York Business Day next succeeding the date of this Agreement;
         and

               (j) The Company and Cabot Corporation shall have furnished or
         caused to be furnished to you at such Time of Delivery certificates of
         officers of the Company and Cabot Corporation satisfactory to you as to
         the accuracy of the representations and warranties of the Company and
         Cabot Corporation herein at and as of such Time of Delivery, as to the
         performance by the Company and Cabot Corporation of all of their
         respective obligations hereunder to be performed at or prior to such
         Time of Delivery, as to the matters set forth in subsections (a) and
         (e) of this Section and as to such other matters as you may reasonably
         request.

         8. (a) Each of the Company and Cabot Corporation, jointly and
severally, will indemnify and hold harmless each Underwriter against any losses,
claims, damages or liabilities, joint or several, to which such Underwriter may
become subject, under the Act or otherwise, insofar as such losses, claims,
damages or liabilities (or actions in respect thereof) arise out of or are based
upon an untrue statement or alleged untrue statement of a material fact
contained in any Preliminary Prospectus, the Registration Statement or the
Prospectus, or any amendment or supplement thereto, or arise out of or are based
upon the omission or alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
and will reimburse each Underwriter for any legal or other expenses reasonably
incurred by such Underwriter in connection with investigating or defending any
such action or claim as such expenses are incurred; provided, however, that
neither the Company nor Cabot Corporation shall be liable in any such case to
the extent that any such loss, claim, damage or liability arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission made in any Preliminary Prospectus, the Registration Statement
or the Prospectus or any such amendment or supplement in reliance upon and in
conformity with written information furnished to the Company by any Underwriter
through Goldman, Sachs & Co. expressly for use therein.

         (b) Each Underwriter will indemnify and hold harmless each of the
Company and Cabot Corporation against any losses, claims, damages or liabilities
to which it may become subject, under the Act or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of or are based upon an untrue statement or alleged untrue statement of a
material fact contained in any Preliminary Prospectus, the Registration
Statement or the Prospectus, or any


                                       12
   13
amendment or supplement thereto, or arise out of or are based upon the omission
or alleged omission to state therein a material fact required to be stated
therein or necessary to make the statements therein not misleading, in each case
to the extent, but only to the extent, that such untrue statement or alleged
untrue statement or omission or alleged omission was made in any Preliminary
Prospectus, the Registration Statement or the Prospectus or any such amendment
or supplement in reliance upon and in conformity with written information
furnished to the Company by such Underwriter through Goldman, Sachs & Co.
expressly for use therein; and will reimburse each of the Company and Cabot
Corporation for any legal or other expenses reasonably incurred by it in
connection with investigating or defending any such action or claim as such
expenses are incurred.

         (c) Promptly after receipt by an indemnified party under subsection (a)
or (b) above of notice of the commencement of any action, such indemnified party
shall, if a claim in respect thereof is to be made against the indemnifying
party under such subsection, notify the indemnifying party in writing of the
commencement thereof; but the omission so to notify the indemnifying party shall
not relieve it from any liability which it may have to any indemnified party
otherwise than under such subsection. In case any such action shall be brought
against any indemnified party and it shall notify the indemnifying party of the
commencement thereof, the indemnifying party shall be entitled to participate
therein and, to the extent that it shall wish, jointly with any other
indemnifying party similarly notified, to assume the defense thereof, with
counsel satisfactory to such indemnified party (who shall not, except with the
consent of the indemnified party, be counsel to the indemnifying party), and,
after notice from the indemnifying party to such indemnified party of its
election so to assume the defense thereof, the indemnifying party shall not be
liable to such indemnified party under such subsection for any legal expenses of
other counsel or any other expenses, in each case subsequently incurred by such
indemnified party, in connection with the defense thereof other than reasonable
costs of investigation. No indemnifying party shall, without the written consent
of the indemnified party, effect the settlement or compromise of, or consent to
the entry of any judgment with respect to, any pending or threatened action or
claim in respect of which indemnification or contribution may be sought
hereunder (whether or not the indemnified party is an actual or potential party
to such action or claim) unless such settlement, compromise or judgment (i)
includes an unconditional release of the indemnified party from all liability
arising out of such action or claim and (ii) does not include a statement as to
or an admission of fault, culpability or a failure to act, by or on behalf of
any indemnified party.

         (d) If the indemnification provided for in this Section 8 is
unavailable to or insufficient to hold harmless an indemnified party under
subsection (a) or (b) above in respect of any losses, claims, damages or
liabilities (or actions in respect thereof) referred to therein, then each
indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, claims, damages or liabilities (or
actions in respect thereof) in such proportion as is appropriate to reflect the
relative benefits received by, in the case of the Company or Cabot Corporation,
the Company on the one hand and by the Underwriters on the other from the
offering of the Shares. If, however, the allocation provided by the immediately
preceding sentence is not permitted by applicable law or if the indemnified
party failed to give the notice required under subsection (c) above, then each
indemnifying party shall contribute to such amount paid or payable by such
indemnified party in such proportion as is appropriate to reflect not only such
relative benefits but also the relative fault of the Company and Cabot
Corporation on the one hand and the Underwriters on the other in connection with
the statements or omissions which resulted in such losses, claims, damages or
liabilities (or actions in respect thereof), as well as any other relevant
equitable considerations. The relative benefits received by the Company on the
one hand and by the Underwriters on the other shall be deemed to be in the same
proportion as the total net proceeds from the offering (before deducting


                                       13
   14
expenses but ignoring the Company's use of such proceeds) received by the
Company bear to the total underwriting discounts and commissions received by the
Underwriters, in each case as set forth in the table on the cover page of the
Prospectus. The relative fault shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged omission to state a material fact relates to information
supplied by the Company or Cabot Corporation on the one hand or the Underwriters
on the other and the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such statement or omission. The Company,
Cabot Corporation and the Underwriters agree that it would not be just and
equitable if contributions pursuant to this subsection (d) were determined by
pro rata allocation (even if the Underwriters were treated as one entity for
such purpose) or by any other method of allocation which does not take account
of the equitable considerations referred to above in this subsection (d). The
amount paid or payable by an indemnified party as a result of the losses,
claims, damages or liabilities (or actions in respect thereof) referred to above
in this subsection (d) shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any such action or claim. Notwithstanding the provisions of this
subsection (d), no Underwriter shall be required to contribute any amount in
excess of the amount by which the total price at which the Shares underwritten
by it and distributed to the public were offered to the public exceeds the
amount of any damages which such Underwriter has otherwise been required to pay
by reason of such untrue or alleged untrue statement or omission or alleged
omission. No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation. The Underwriters'
obligations in this subsection (d) to contribute are several in proportion to
their respective underwriting obligations and not joint.

         (e) The obligations of the Company and Cabot Corporation under this
Section 8 shall be in addition to any liability which the Company and Cabot
Corporation may otherwise have and shall extend, upon the same terms and
conditions, to each person, if any, who controls any Underwriter within the
meaning of the Act; and the obligations of the Underwriters under this Section 8
shall be in addition to any liability which the respective Underwriters may
otherwise have and shall extend, upon the same terms and conditions, to each
officer and director of the Company or of Cabot Corporation and to each person,
if any, who controls the Company or Cabot Corporation within the meaning of the
Act.

         9. (a) If any Underwriter shall default in its obligation to purchase
the Shares which it has agreed to purchase hereunder at a Time of Delivery, you
may in your discretion arrange for you or another party or other parties to
purchase such Shares on the terms contained herein. If within thirty-six hours
after such default by any Underwriter you do not arrange for the purchase of
such Shares, then the Company shall be entitled to a further period of
thirty-six hours within which to procure another party or other parties
satisfactory to you to purchase such Shares on such terms. In the event that,
within the respective prescribed periods, you notify the Company that you have
so arranged for the purchase of such Shares, or the Company notifies you that it
has so arranged for the purchase of such Shares, you or the Company shall have
the right to postpone such Time of Delivery for a period of not more than seven
days, in order to effect whatever changes may thereby be made necessary in the
Registration Statement or the Prospectus, or in any other documents or
arrangements, and the Company agrees to file promptly any amendments to the
Registration Statement or the Prospectus which in your opinion may thereby be
made necessary. The term "Underwriter" as used in this Agreement shall include
any person substituted under this Section with like effect as if such person had
originally been a party to this Agreement with respect to such Shares.


                                       14
   15
         (b) If, after giving effect to any arrangements for the purchase of the
Shares of a defaulting Underwriter or Underwriters by you and the Company as
provided in subsection (a) above, the aggregate number of such Shares which
remains unpurchased does not exceed one-eleventh of the aggregate number of all
the Shares to be purchased at such Time of Delivery, then the Company shall have
the right to require each non-defaulting Underwriter to purchase the number of
shares which such Underwriter agreed to purchase hereunder at such Time of
Delivery and, in addition, to require each non-defaulting Underwriter to
purchase its pro rata share (based on the number of Shares which such
Underwriter agreed to purchase hereunder) of the Shares of such defaulting
Underwriter or Underwriters for which such arrangements have not been made; but
nothing herein shall relieve a defaulting Underwriter from liability for its
default.

         (c) If, after giving effect to any arrangements for the purchase of the
Shares of a defaulting Underwriter or Underwriters by you and the Company as
provided in subsection (a) above, the aggregate number of such Shares which
remains unpurchased exceeds one-eleventh of the aggregate number of all the
Shares to be purchased at such Time of Delivery, or if the Company shall not
exercise the right described in subsection (b) above to require non-defaulting
Underwriters to purchase Shares of a defaulting Underwriter or Underwriters,
then this Agreement (or, with respect to the Second Time of Delivery, the
obligations of the Underwriters to purchase and of the Company to sell the
Optional Shares) shall thereupon terminate, without liability on the part of any
non-defaulting Underwriter or the Company, except for the expenses to be borne
by the Company and the Underwriters as provided in Section 6 hereof and the
indemnity and contribution agreements in Section 8 hereof; but nothing herein
shall relieve a defaulting Underwriter from liability for its default.

         10. The respective indemnities, agreements, representations, warranties
and other statements of the Company, Cabot Corporation and the several
Underwriters, as set forth in this Agreement or made by or on behalf of them,
respectively, pursuant to this Agreement, shall remain in full force and effect,
regardless of any investigation (or any statement as to the results thereof)
made by or on behalf of any Underwriter or any controlling person of any
Underwriter, or the Company, Cabot Corporation, or any officer or director or
controlling person of the Company or Cabot Corporation, and shall survive
delivery of and payment for the Shares.

         11. If this Agreement shall be terminated pursuant to Section 9 hereof,
neither the Company nor Cabot Corporation shall then be under any liability to
any Underwriter except as provided in Sections 6 and 8 hereof; but, if for any
other reason, any Shares are not delivered by or on behalf of the Company as
provided herein, the Company will reimburse the Underwriters through you for all
out-of-pocket expenses approved in writing by you, including fees and
disbursements of counsel, reasonably incurred by the Underwriters in making
preparations for the purchase, sale and delivery of the Shares not so delivered,
but neither the Company nor Cabot Corporation shall then be under any further
liability to any Underwriter except as provided in Sections 6 and 8 hereof.

         12. In all dealings hereunder, you shall act on behalf of each of the
Underwriters, and the parties hereto shall be entitled to act and rely upon any
statement, request, notice or agreement on behalf of any Underwriter made or
given by you jointly or by Goldman, Sachs & Co. on behalf of you as the
representatives.

         All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex or
facsimile transmission to you as the representatives in care of Goldman, Sachs &
Co., 32 Old Slip, 21st Floor, New York, New York 10005, Attention: Registration
Department; and if to the Company shall be delivered or sent by mail to the
address of the Company set forth in the Registration Statement, Attention:
Secretary; provided, however, that any notice to an Underwriter pursuant to
Section 8(c) hereof shall be delivered or sent


                                       15
   16
by mail, telex or facsimile transmission to such Underwriter at its address set
forth in its Underwriters' Questionnaire, or telex constituting such
Questionnaire, which address will be supplied to the Company by you upon
request. Any such statements, requests, notices or agreements shall take effect
upon receipt thereof.

         13. This Agreement shall be binding upon, and inure solely to the
benefit of, the Underwriters, the Company, Cabot Corporation and, to the extent
provided in Sections 8 and 10 hereof, the officers and directors of the Company
and Cabot Corporation and each person who controls the Company, Cabot
Corporation or any Underwriter, and their respective heirs, executors,
administrators, successors and assigns, and no other person shall acquire or
have any right under or by virtue of this Agreement. No purchaser of any of the
Shares from any Underwriter shall be deemed a successor or assign by reason
merely of such purchase.

         14. Time shall be of the essence of this Agreement. As used herein, the
term "business day" shall mean any day when the Commission's office in
Washington, D.C. is open for business.

         15. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF NEW YORK.

         16. This Agreement may be executed by any one or more of the parties
hereto in any number of counterparts, each of which shall be deemed to be an
original, but all such counterparts shall together constitute one and the same
instrument.


                                       16
   17
         If the foregoing is in accordance with your understanding, please sign
and return to us seven counterparts hereof, and upon the acceptance hereof by
you, on behalf of each of the Underwriters, this letter and such acceptance
hereof shall constitute a binding agreement between each of the Underwriters,
the Company and Cabot Corporation. It is understood that your acceptance of this
letter on behalf of each of the Underwriters is pursuant to the authority set
forth in a form of Agreement among Underwriters, the form of which shall be
submitted to the Company and Cabot Corporation for examination upon request, but
without warranty on your part as to the authority of the signers thereof.

                                        Very truly yours,

                                        CABOT MICROELECTRONICS CORPORATION

                                        By: ....................................
                                            Name:
                                            Title:


                                        CABOT CORPORATION

                                        By: ....................................
                                            Name:
                                            Title:


Accepted as of the date hereof:

GOLDMAN, SACHS & CO.
MERRILL LYNCH, PIERCE, FENNER & SMITH
                     INCORPORATED
FLEETBOSTON ROBERTSON STEPHENS INC.


By:.........................................
            (Goldman, Sachs & Co.)

    On behalf of each of the Underwriters


                                       17
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                                   SCHEDULE I

Fumed Metal Oxide Supply Agreement
Dispersion Services Agreement
Master Separation Agreement
Trademark License Agreement
Management Services Agreement
Confidential Disclosure and License Agreement
Initial Public Offering and Distribution Agreement
Tax Sharing Agreement
Registration Rights Agreement
Employee Matters Agreement


                                       18
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                                   SCHEDULE II



                                                              NUMBER OF OPTIONAL
                                                                SHARES TO BE
                                           TOTAL NUMBER OF      PURCHASED IF
                                             FIRM SHARES       MAXIMUM OPTION
               UNDERWRITER                 TO BE PURCHASED        EXERCISED
               -----------                 ---------------        ---------
                                                        
Goldman, Sachs & Co....................
Merrill Lynch, Pierce, Fenner & Smith
                   Incorporated........
FleetBoston Robertson Stephens Inc.....

         Total.........................



                                       19
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                                                                         ANNEX I

                    [To come from PricewaterhouseCoopers LLP]


                                       20