CONSULTING AGREEMENT
                                  AS ADVISOR TO
                             CHIEF EXECUTIVE OFFICER


     This  Consulting  Agreement  ("Agreement")  is made as dated below,  by and
between Dr. Robert M. Sandfort ("Dr.  Sandfort") and MEMC Electronic  Materials,
Inc. ("MEMC").  Dr. Sandfort and MEMC have mutually agreed to end Dr. Sandfort's
employment with MEMC, so that Dr. Sandfort may pursue other interests and become
a consulting  advisor to MEMC's CEO. Dr. Sandfort has been employed as President
and Chief  Operating  Officer of MEMC. Dr. Sandfort also serves as a Director on
the MEMC Board of Directors. In order to resolve any and all matters arising out
of the employment  relationship  and its  termination,  and in order to insure a
smooth transition of Dr. Sandfort's job duties and to continue to take advantage
of Dr.  Sandfort's  skills and  experience,  the parties  have entered into this
Agreement. The parties agree as follows:

     1. Dr. Sandfort will voluntarily retire and resign his employment with MEMC
effective December 1, 1997  ("Termination  Date"). Dr. Sandfort will receive all
regular  compensation  due for  services  rendered as an MEMC  employee  through
November 30, 1997 on the next regular pay date. In addition,  Dr.  Sandfort will
receive  payment  for all  accrued  but  unused  vacation  time in the amount of
$47,525.60,  payable on December  15,  1997.  Dr.  Sandfort  (or his  designated
beneficiary,  if he should  die before the  scheduled  payment  date) also shall
receive  compensation due him pursuant to the Employment  Agreement dated May 1,
1995 between Dr. Sandfort and MEMC (the "Employment Agreement") in the aggregate
amount of $561,666.67,  payable as follows:  $28,083.33  payable on December 15,
1997; $337,000.00 payable on January 2, 1998; and $196,583.34 payable on January
4,  1999.  The  Employment  Agreement,  which  is  attached  as  Exhibit  A  and
incorporated  by  reference  herein,  shall  be  deemed  to be  amended  by  all
provisions of this Agreement that are inconsistent therewith.  Capitalized terms
used  herein but not  defined  herein  shall have the  meanings  assigned in the
Employment  Agreement.  "Agreement" shall mean this Consulting  Agreement unless
the context otherwise requires.

     2. For a  one-year  period  beginning  with the day  after  Dr.  Sandfort's
Termination  Date  ("Consulting  Period"),  Dr.  Sandfort agrees to make himself
reasonably  available for consultation with MEMC either by phone or in person as
reasonably  requested  by MEMC on such matters as MEMC may  reasonably  request.
During the  Consulting  Period Dr.  Sandfort  shall be  considered  a consulting
advisor to MEMC's CEO. Dr. Sandfort shall be free to perform services for others
when not  performing  under  this  Agreement;  provided,  that  nothing  in this
Agreement  will  eliminate  or  modify  in  any  way  the   confidentiality  and
non-competition  restrictions placed upon Dr. Sandfort by Paragraphs 5.1 and 5.2
of the Employment  Agreement,  which  paragraphs are  incorporated  by reference
herein and shall be effective as of the Termination  Date,  except that (a) such
paragraphs  shall be  interpreted  solely with  reference to the  definition  of
"Competitive Work" set forth in the Confidentiality  Agreement dated as of March
31, 1989 (the "Confidentiality  Agreement"),  which is incorporated by reference
in the Employment  Agreement;  and (b) the written  consent of MEMC described in
the first  paragraph of the section of the  Confidentiality  Agreement  entitled
"Competitive Activity" shall not be unreasonably withheld and shall be deemed to
have been given if Dr.  Sandfort  has  received no response  from MEMC as of the
14th day  after  Dr.  Sandfort  has  furnished  the  written  evidence  required
thereunder to MEMC.

     3. The  parties  agree that  during the  Consulting  Period,  the  parties'
relationship will be that of a client and an independent contractor. During this
period Dr.  Sandfort  will not be  considered  an agent or  employee of MEMC and
therefore will not  necessarily be entitled to any of the benefits MEMC provides
its employees,  including but not limited to health,  worker's  compensation and
pension or profit  sharing  plans;  except that nothing  contained  herein shall
deprive Dr. Sandfort of any benefits to which he is entitled under Section 3.1.1
of the Employment Agreement, under any plan providing benefits during retirement
if and when Dr. Sandfort elects to begin receiving  retirement  income,  and any
other  benefits  that  may  be  specifically   provided  under  this  Consulting
Agreement.  Nothing in this  Agreement  shall  adversely  affect Dr.  Sandfort's
rights with respect to any vested profit sharing or pension monies,  if any; Dr.
Sandfort's right to begin receiving  retirement  income, if he is eligible under
the terms of any  plan,  at any time  before,  during,  or after the  Consulting
Period;  or Dr.  Sandfort's  rights  under  any  other  plan for which he may be
eligible or any law,  including  without  limitation  the  Consolidated  Omnibus
Reconciliation Act of 1986 ("COBRA").

     4.  In  consideration  of Dr.  Sandfort's  consulting  services  and  other
promises  herein,  on  January 2, 1998,  MEMC will pay to Dr.  Sandfort  (or his
designated  beneficiary,  if he should die before January 2, 1998) a lump sum in
the amount of $539,751.00. In addition, Dr. Sandfort will be paid an hourly rate
of $250 for each hour and fraction thereof which he spends providing  consulting
services,  with a minimum of two hours for each telephone  consultation and four
hours for each requested  consultation in person. In addition, Dr. Sandfort will
be reimbursed for all reasonable expenses incurred as a result of his performing
consulting  services.  To the extent that Dr. Sandfort  requires  administrative
support to perform  his  consulting  duties,  these  will be  provided  by MEMC;
provided that, it is expressly  understood that MEMC will not be responsible for
providing Dr. Sandfort with office facilities at any MEMC location. Dr. Sandfort
expressly  acknowledges  that the  monies  paid  hereunder  are  over and  above
anything which MEMC may owe him for his services prior to the termination of his
employment  and  represents  additional  pay and benefits to which Dr.  Sandfort
would not normally be entitled at the end of his employment.

     If Dr.  Sandfort  is  required  to  travel in order to  provide  consulting
services to MEMC, MEMC shall provide travel insurance in an amount not less than
that  for  which  Dr.  Sandfort  was  eligible  during  the  month  prior to the
Termination Date.

     5. The parties also agree as follows:

     (a)  MEMC shall take or cause to be taken all actions necessary such that:

          (1)  all stock options  previously  awarded to Dr.  Sandfort under any
               plan of MEMC  ("Options")  that have not vested  shall vest as of
               the Termination Date;

          (2)  if at any time in the  future  MEMC  issues  Options  to  replace
               Options  granted  as of the same  date as any  Options  that then
               remain outstanding,  the effect of which is to lower the exercise
               price under the Options being replaced,  MEMC shall issue Options
               to  replace  outstanding  Options on the same terms as such other
               Options,  subject  to  Subsection  5(a)(3)  and  subject  to  the
               execution of such documents as MEMC reasonably requires to assure
               compliance with the securities laws.

          (3)  Dr.  Sandfort  shall have all rights  under the Equity  Incentive
               Plan or Long Term Incentive  Plan, as the case may be, to pay any
               Option  exercise  price in shares of stock or  through a cashless
               exercise  procedure,  as well as the  right  to  elect  to pay in
               shares  of  stock  all or a part  of any  amount  required  to be
               withheld to satisfy  income tax liability in connection  with the
               exercise of any Option (unless such election would subject him to
               liability  under Section 16(b) of the Securities  Exchange Act of
               1934, as amended);

          (4)  Dr. Sandfort shall be allowed to exercise all Options  (including
               any replacement  options) until the tenth anniversary of the date
               on which each Option was granted; and

          (5)  all shares of restricted stock previously awarded to Dr. Sandfort
               under any plan of MEMC ("Restricted  Stock") that have not vested
               shall  vest  as  of  the  Termination  Date,  and  all  remaining
               restrictions  on such  Restricted  Stock  shall  lapse  as of the
               Termination Date.

     (b)  The  six (6)  month  prior  irrevocable  election  requirement  of the
          Supplemental  Executive  Pension  Plan shall be waived.  As payment in
          full for all amounts due him from the Supplemental  Executive  Pension
          Plan, Dr.  Sandfort (or his designated  beneficiary,  if he should die
          before  the   scheduled   payment  date)  shall  receive  120  monthly
          installment payments as follows:

          (1)  $10,588.11 each month in 1998;

          (2)  $10,764.58 each month in 1999;

          (3)  $10,946.24 each month in 2000;

          (4)  $11,133.88 each month in 2001;

          (5)  $11,328.73 each month in 2002;

          (6)  $11,532.64 each month in 2003;

          (7)  $11,748.88 each month in 2004;

          (8)  $11,983.86 each month in 2005;

          (9)  $12,253.50 each month in 2006; and

          (10) $12,621.10 each month in 2007.

     (c)  Dr. Sandfort (or his designated  beneficiary,  if he should die before
          the scheduled payment date) also shall receive as retirement income in
          addition to amounts due him from the  Supplemental  Executive  Pension
          Plan, 120 monthly installment payments as follows

          (1)  $11,644.68 each month in 1998;

          (2)  $11,838.76 each month in 1999;

          (3)  $12,038.54 each month in 2000;

          (4)  $12,244.91 each month in 2001;

          (5)  $12,459.20 each month in 2002;

          (6)  $12,683.47 each month in 2003;

          (7)  $12,921.28 each month in 2004;

          (8)  $13,179.71 each month in 2005;

          (9)  $13,476.25 each month in 2006; and

          (10) $13,880.54 each month in 2007.

     (d)  MEMC shall advance to Dr.  Sandfort as an interest free loan an amount
          equal to 47.05% of the  gross  income  realized  by Dr.  Sandfort  for
          federal  income  tax  purposes  resulting  from  the  vesting  of MEMC
          Restricted  Stock on December 1, 1997, which loan shall be advanced in
          sufficient  time to fund the required tax  withholding on such income.
          Such loan  shall be repaid in full no later than  January 2, 2003.  In
          addition,  on April 15 after each year  during the period  December 1,
          1997 through  December 31, 2002, MEMC shall pay Dr. Sandfort an amount
          equal to 47.05% of the amount of imputed interest  reported by MEMC to
          Dr.  Sandfort  for federal  income tax  purposes  for the  immediately
          preceding year.

     (e)  MEMC shall deposit  $2,661,282.29  in the MEMC  Electronic  Materials,
          Inc.  Supplemental  Executive  Pension Plan Trust in January,  1998 to
          provide a source of  payment of the  amounts  due Dr.  Sandfort  under
          Subsections 5(b) and 5(c) above.

     6.  Dr.   Sandfort  agrees  to  release  MEMC  and  its  past  and  present
shareholders,   officers,   directors,   agents,   employees,   representatives,
attorneys, successors and assigns, and affiliated or related companies (Released
Parties),  from any and all claims  made,  to be made,  or which might have been
made as a consequence of Dr.  Sandfort's  employment with MEMC or arising out of
the  termination of said  employment  relationship  other than the breach of any
provision of this Agreement by MEMC. This release  specifically  applies to, but
is not  limited  to,  any and all  claims  for back pay,  front  pay,  sick pay,
bonuses,  or any other form of compensation or benefits not expressly  preserved
herein,  claims of  wrongful  or  retaliatory  discharge,  and any and all other
claims arising under federal, state, or local law, known or unknown, which exist
as of the date of the  execution  of this  Agreement,  whether such claims arise
under  either  common  law  (whether  sounding  in tort or  contract)  or  under
constitution,  statute or ordinance,  including by way of illustration Title VII
of the Civil Rights Act of 1954, as amended, 42 U.S.C. Section 2000(e), et seq.;
the Missouri Human Rights Act, as amended,  and the Americans With  Disabilities
Act, 42 U.S.C.  Section 12101, et seq., the Age Discrimination in Employment Act
of 1967, 29 U.S.C. Section 621, et seq.

     7. Dr.  Sandfort  agrees never to institute,  directly or  indirectly,  any
action or proceeding of any kind against any Released  Party,  on account of any
matters over which he has waived his rights in this Agreement.

     8.  MEMC   hereby   releases   Dr.   Sandfort   and  his  heirs,   personal
representatives, successors, and assigns from any and all claims of every nature
and description,  whether known or unknown,  prior to the date hereof. This does
not release Dr.  Sandfort from any claim which may be made as a  consequence  of
the future breach by Dr. Sandfort of any provision of this Agreement.

     9. MEMC agrees never to institute,  directly or  indirectly,  any action or
proceeding  of any kind  against Dr.  Sandfort,  on account of any matters  over
which MEMC has waived its rights in this Agreement.

     10. Within seven (7) days  following Dr.  Sandfort's  Termination  Date, he
shall  return  to MEMC  any and all  property  of MEMC  which he may have in his
possession  or control,  if any,  including,  but not  limited to any  financial
records or  reports,  memoranda,  and all other  documents,  recordings,  tapes,
disks,  etc.,  whether written or electronic,  and without  retaining any copies
thereof, except that he may retain copies of those documents that may be helpful
to him in preparing an updated resume. Upon completion of the Consulting Period,
he shall also return all MEMC  property  with which he may be provided,  without
retaining copies.

     11. The provisions of this Agreement governed by state law will be governed
by Missouri  law,  exclusive  of any rules that would  apply to another  state's
substantive  rules of law or  equity,  or  which  would  in any way  impair  the
enforceability of the arbitration provision described in paragraph 18 below.

     12. This Agreement shall be binding upon, and shall inure to the benefit of
MEMC and Dr. Sandfort and their  respective  heirs,  executors,  administrators,
legal  representatives,  successors  and assigns;  and MEMC  affirmatively  will
require any  successor  to all or any portion of the business  and/or  assets of
MEMC that includes the  obligations to which MEMC is bound under this Agreement,
whether  succession  is direct or indirect  and without  regard to the manner by
which  it is  effected,  including  without  limitation  purchase,  merger,  and
consolidation, expressly to assume and perform this Agreement in the same manner
and to the same  extent  that MEMC  would be  required  to perform it if no such
succession had taken place. As used in this Agreement,  "MEMC" shall include any
such successor.

     13. Dr.  Sandfort  agrees not to reapply  for  employment  with MEMC at any
time.

     14. The parties  agree that in the event either  party  breaches any of the
provisions  of this  Agreement,  either  party  shall be entitled to any and all
equitable  remedies  provided  by  law.  Moreover,  if a party  prevails  in any
litigation or arbitration related to a breach of this Agreement,  the prevailing
party shall be entitled to the  reimbursement  of  reasonable  attorney's  fees,
expenses and court costs incurred in such litigation or arbitration.

     15.  The  parties  mutually  agree  that the  terms of this  Agreement  are
strictly  confidential.  They will not be discussed  or  otherwise  disclosed to
third parties.  However,  the parties  expressly  understand that nothing herein
prohibits  the divulging or reporting of anything  related to this  Agreement as
required by law,  regulation,  governmental  authority  or similar  body,  or as
required  in the  written  opinion of counsel to comply  with  applicable  laws,
including  securities  laws and regulations or stock exchange  requirements,  it
being expressly  acknowledged and agreed that this Agreement and all amendments,
attachments and exhibits thereto shall be filed with the Securities and Exchange
Commission ("the SEC") and furnished to parties requesting copies of exhibits to
filings with the SEC. The parties further acknowledge that employees of MEMC may
learn of the terms of this Agreement in the ordinary course of business and that
Dr. Sandfort's spouse, attorneys, accountants and advisors may also learn of its
terms.  However,  the parties will undertake to advise such persons as discussed
in the foregoing sentence that they are not to disclose or otherwise divulge the
terms of this Agreement.

     16. Dr. Sandfort expressly acknowledges that he has been advised to consult
with an attorney of his choice regarding his execution of this document, that he
has been told that he has  twenty-one  (21) days from his date of receipt of the
final version of this  Agreement to either accept or reject its terms,  and that
if he executes this Agreement,  he shall have the right to revoke his acceptance
by notifying  MEMC, in writing,  within seven (7) days of his execution,  of his
revocation.

     17.  Dr.  Sandfort  shall  remain a member of the  Board as a  non-employee
Director of MEMC,  until such time as he is removed or is reappointed,  provided
that he shall  resign  from the Board  forty-five  (45)  days  prior to the 1998
annual  meeting  unless  requested in writing not to do so. Dr.  Sandfort  shall
receive fees and other compensation,  if any, as a non-employee Director of MEMC
at the same level as determined for MEMC's other non-employee Directors, payable
during such time as Dr. Sandfort continues to serve as a member of the Board.

     18. Any disputes  between the parties to this Agreement shall be settled by
arbitration  in St. Louis,  Missouri,  before a single  arbitrator in accordance
with  the   Commercial   Arbitration   Rules  under  the  American   Arbitration
Association,  provided that discovery  shall be permitted in accordance with the
Federal  Rules of Civil  Procedure.  The decision of such  arbitration  shall be
final and  conclusive  on the parties,  and judgment  upon such  decision may be
entered in any court having jurisdiction thereof.

     19. If a court of  competent  jurisdiction  determines  that any  provision
contained  in this  Agreement,  or any part  thereof,  cannot  for any reason be
enforced,  the  parties  agree  that  such  determination  shall  not  affect or
invalidate the remainder of this Agreement.

     20. MEMC makes no  representations  and is not responsible  with respect to
the income tax and securities law  consequences to Dr.  Sandfort  resulting from
this Agreement and the compensation and benefits payable pursuant  thereto.  All
amounts payable  pursuant to this Agreement are subject to federal and state tax
withholding as required by applicable law from time to time.

     21.  Dr.   Sandfort   may   designate  a   beneficiary   or   beneficiaries
(contingently,  consecutively,  or  successively)  of a death  benefit,  if any,
payable under this  Agreement  and, from time to time, may change his designated
beneficiary.  A beneficiary may be a trust. A beneficiary  designation  shall be
made in writing and delivered to MEMC while Dr.  Sandfort is alive.  If there is
no designated beneficiary surviving at the death of Dr. Sandfort, payment of any
death benefit shall be made to his surviving spouse,  and if he has no surviving
spouse, to his estate.

     22.  Sandfort  hereby  agrees  now and at any time in the future to refrain
from making any comments or  statements  to the press,  the employees of MEMC or
any individual or entity with whom MEMC has a business  relationship  or others,
(i) which would be likely to  adversely  affect the  conduct of the  business of
MEMC or any of its  affiliates,  or any of their  plans or  prospects,  or their
business   reputations,   or  the   business   reputations   of  any  of   their
representatives  or members of their  respective  boards of  directors,  or (ii)
which would  disparage in any way or cast in a negative light MEMC or any of its
affiliates, or any of their respective directors, officers, agents or employees.
MEMC hereby  agrees now and at any time in the future to refrain from making any
comments  or  statements  to the press or any  individual  or  entity  with whom
Sandfort  has a business  relationship  or others,  (i) which would be likely to
adversely  affect the  business  reputation  of  Sandfort,  or (ii) which  would
disparage in any way or cast in a negative light Sandfort.

     23. The parties acknowledge that each has read this Agreement consisting of
9 pages, 23 sections,  and the attached  exhibits and fully understand same. Dr.
Sandfort also  acknowledges that he agrees to all of the terms and conditions of
this Agreement and that he does so of his own free will and without coercion and
that he has had an  opportunity  to review this document with an attorney of his
choice.  MEMC  represents  that it has the  corporate  authority  to enter  this
Agreement and has taken or will take all steps  necessary to carry out its terms
and conditions. The parties agree that no representation or promise inconsistent
with or  additional  to the terms of this  Agreement  have been made,  that this
Agreement  includes  all  referenced  Exhibits  and is  the  full  and  complete
agreement of the parties, and that this Agreement may not be modified,  changed,
or added to except in writing signed by all parties.

     THE PARTIES  ACKNOWLEDGE THAT THE INSTANT AGREEMENT  CONTAINS A BINDING AND
ENFORCEABLE ARBITRATION PROVISION.

SO AGREED:                            MEMC ELECTRONIC MATERIALS, INC.

/s/ Robert M. Sandfort                By:    /s/ Ludger H. Viefhues
- -------------------------                    ------------------------
Robert M. Sandfort, Ph.D.             Title: CEO

Date:  December 1, 1997                Date:  December 1, 1997
       ------------------                     -----------------------



                                                                       Exhibit A

                              EMPLOYMENT AGREEMENT


     EMPLOYMENT  AGREEMENT  dated as of May 1, 1995 (the  "Agreement"),  between
MEMC ELECTRONIC MATERIALS,  INC. of St. Peters, Missouri, a Delaware corporation
("MEMC"), and Dr. Robert M. Sandfort (the "Executive").

     WHEREAS,  MEMC desires to employ the  Executive and to assure itself of the
continued services of the Executive and the availability of his advise,  counsel
and leadership for the term of employment provided for in this Agreement; and

     WHEREAS,  the Executive  desires to accept such  employment  and enter into
this Agreement;

     NOW,   THEREFORE,   in   consideration  of  the  covenants  and  agreements
hereinafter set forth, the parties hereto agree as follows:

     1. Term.

     Subject  to  Sections  3,  4 and 5  below,  the  term  of  the  Executive's
employment  under this  Agreement  shall  commence on the effective  date of the
Registration  Statement  on Form  S-1 in  connection  with  the  initial  public
offering  (the "IPO")  "hereinafter,  the "IPO date") of  securities of MEMC and
shall terminate on the first day of the month  following the fourth  anniversary
of the IPO Date (the "Term").  During the Term,  the  Executive  will devote his
full  business  time to his  duties as  President  and Chief  Operating  Officer
("COO") of MEMC. In such capacity, the Executive agrees to serve MEMC faithfully
and to the best of his ability  under the direction of the Board of Directors of
MEMC (the "Board"). The Executive also agrees to serve, if elected or appointed,
at no compensation  in addition to that provided for in this  Agreement,  in the
position of officer or director of any affiliate of MEMC.

     2. Compensation and Benefits.

     2.1.  Compensation.  In  consideration  of the Executive's  agreement to be
employed by MEMC under the terms and  provision  of this  Agreement,  MEMC shall
provide the Executive with the compensation  arrangements listed on the attached
Schedule 1; provided,  however,  that the grants of options and restricted stock
described  therein shall be subject to the  consummation by MEMC of the IPO. The
Executive's  compensation  as  described  in Schedule 1 shall be reviewed by the
Board,  based  upon the  Executive's  performance  and then  current  titles and
responsibilities,  not less often than annually. The Executive's base salary may
be increased,  but not decreased,  based on his performance and upon the Board's
view of the appropriate base salary for the titles and responsibilities assigned
to the Executive from time to time. Compensation of the Executive is primarily a
function of company  performance  and individual  performance  and could, in any
given year, be higher or lower than that of other COOs in comparable  positions.
But it is the intent that  MEMC's  compensation  opportunity  be  structured  to
afford comparable pay given comparable performance by the Executive and MEMC. In
addition to any increases  effected as a result of such review, the Board at any
time  may  in  its  sole  discretion   increase  the  Executive's  base  salary.
Compensation  will  include but not be limited to: (a) base  salary;  (b) annual
incentives;  (c) grants of options,  restricted  stock or other  awards under an
omnibus  equity  incentive plan (the "Equity  Incentive  Plan") to be adopted by
MEMC prior to  consummation of the IPO; and (d)  participation  in any long term
incentive plan established by MEMC.

     2.2.  Pension  Benefits.  The  Executive  shall  continue to be entitled to
participate  in the MEMC Pension Plan for Salaried  Employees (the "MEMC Pension
Plan").

     2.3. Other Employee  Benefits.  The Executive shall be entitled to continue
to participate as a vested employee in any welfare plans of MEMC, including, but
not limited to, medical,  dental,  life insurance,  and disability  income,  and
perquisites  to which an employee of comparable or lesser grade level in MEMC is
entitled.

     3. Termination Payments.

     3.1. Termination Without Cause.

     3.1.1.  General.  Subject  to  Section  5  below,  if MEMC  terminates  the
Executive's  employment without Cause (as defined below) prior to the expiration
of the Term,  (i) MEMC shall be obligated to pay the  Executive his then current
base salary for the balance of the Term (the  "Severance  Period") in accordance
with MEMC's  payroll  practices,  (ii) all unvested  options  granted  under the
Equity  Incentive Plan shall vest and all  restrictions  on awards granted under
the Equity  Incentive Plan shall lapse and (iii) the Executive  shall be allowed
to exercise all stock options granted under the Equity  Incentive Plan until the
earlier of (A) the later of (x) one year following the date of  termination  and
(y) the first day of the month following the fourth  anniversary of the IPO Date
and (B) the expiration of the term of the stock option; provided,  however, that
the  Executive  may  exercise any  incentive  stock  options  until three months
following the date of termination (or, if earlier,  until expiration of the term
of such  incentive  stock  options).  In addition,  in the event of  termination
without Cause, the then current year annual incentive will be paid at such level
and at such  time as  payment  is made to  MEMC's  other  executives  under  the
applicable  bonus plan. The Executive shall have no further right to receive any
other  compensation  or  benefits  after  such  termination  or  resignation  of
employment,  except as determined  in accordance  with the terms of the employee
benefit plans or programs of MEMC or as provided in Section 2.2 above.

     3.1.2.  Conditions  Applicable  to the  Severance  Period.  If,  during the
Severance Period, the Executive breaches his obligations under Section 5 of this
Agreement,  MEMC may,  upon  written  notice  to the  Executive,  terminate  the
Severance  Period and cease to make any further payments or provide any benefits
described in Section 3.1.1. except as determined in accordance with the terms of
the  employee  benefit  plans or programs of MEMC as provided for in Section 2.2
above.

     3.1.3. Death During Severance Period. In the event of the Executive's death
during the  Severance  Period,  payments  of the  severance  amounts  under this
Section 3 shall continue to be made during the remainder of the Severance Period
to the  beneficiary  designated in writing for this purpose by the Executive or,
if no such beneficiary is specifically designated, to the Executive's estate.

     3.1.4. Date of Termination.  The date of termination of employment  without
Cause shall be the date  specified  in a written  notice of  termination  to the
Executive (which date shall be coincident with or subsequent to the date of such
notice).

     3.2. Termination for Cause: Resignation by the Executive.

     3.2.1.  General.  If, prior to the expiration of the Term, the  Executive's
employment is terminated  by MEMC for Cause,  or the Executive  resigns from his
employment  hereunder,  the  Executive  shall be entitled to payment of his base
salary  as then in effect  through  and  including  the date of  termination  or
resignation.  The  Executive  shall have no further  right to receive  any other
compensation  or benefits  after such  termination or resignation of employment,
except as determined in accordance with the terms of the employee  benefit plans
or programs of MEMC or as provided in Section 2.2 above.

     3.2.2. Date of Termination. Subject to the proviso to Section 3.3, the date
of  termination  for Cause shall be the date  specified  in a written  notice of
termination  to the  Executive.  The  date  of  resignation  shall  be the  date
specified in the written notice of resignation from the Executive to MEMC (which
date shall be  coincident  with or subsequent to the date of such notice) or, if
no date is specified therein,  10 business days after receipt by MEMC of written
notice of resignation from the Executive.

     3.3.  Cause.   Termination  for  "Cause"  shall  mean  termination  of  the
Executive's employment because of:

          (i) any act or  omission  that  constitutes  a material  breach by the
     Executive of any of his material  obligations  under this Agreement  (other
     than by reason of his death or Permanent Disability (as defined below));

          (ii) the continued  failure or refusal of the Executive to perform the
     material  duties  required  of him as an  employee  of MEMC  (other than by
     reason of his death or Permanent Disability);

          (iii) any willful  material  violation by the  Executive of any law or
     regulation  applicable to the business of MEMC or any of its  subsidiaries,
     or the Executive's  conviction of a felony, or any willful  perpetration by
     the Executive of a common law fraud; or

          (iv) any other willful misconduct by the Executive which is materially
     injurious  to the  financial  condition  or business  reputation  of, or is
     otherwise  materially  injurious  to,  MEMC or any of its  subsidiaries  or
     affiliates;

provided, however, that if any such Cause relates to the Executive's obligations
under this  Agreement and (x) is susceptible to cure and (y) does not constitute
a repetition of such Cause, MEMC shall not terminate the Executive's  employment
hereunder  unless  MEMC first gives the  Executive  notice of its  intention  to
terminate  and of the grounds for such  termination,  and the Executive has not,
within 10 business days following receipt of the notice, cured such Cause, or in
the event such Cause is not  susceptible  to cure within  such 10  business  day
period, the Executive has not taken all reasonable steps within such 10 business
day period to cure such Cause as promptly as practicable thereafter.

     4. Death or Disability.

     In the event of  termination  of the  Executive's  employment  by reason of
death or Permanent  Disability (as hereinafter  defined),  the Executive (or his
estate, as applicable) shall be entitled to base salary and benefits  determined
under  Section 2 hereof  through the date of death or, in the case of  Permanent
Disability,  through the later of the date of termination or the date (not later
than one  year  following  the  date of  termination)  on  which  the  Executive
commences to receive disability  benefits (including a pro rata annual incentive
for the year of death or disability at the maximum  opportunity  level). For 50%
of the restricted  stock held by the Executive on the date of the termination of
his  employment,   all  restrictions  will  immediately   lapse.  The  remaining
restricted  stock and options  outstanding  will  continue to vest in accordance
with Schedule 1 as if his employment has not terminated. Other benefits shall be
determined in accordance with the benefit plans  maintained by MEMC,  including,
without limitation,  the Equity Incentive Plan and any Long Term Incentive Plan,
and MEMC  shall have no  further  obligation  hereunder.  For  purposes  of this
Agreement,  "Permanent  Disability"  means a physical  or mental  disability  or
infirmity of the Executive that prevents the normal performance of substantially
all his duties as an employee  of MEMC,  which  disability  or  infirmity  shall
exist,  or in the opinion of an  independent  physician is reasonably  likely to
exist, for any continuous period of 180 days.

     5. Restrictive Covenants.

     5.1  Non-Compete:  Confidentiality.  For the period  extending  through the
later of (i) April 1, 2000 and (ii) two years  following the date of termination
of the Executive's  employment  with MEMC or its affiliates,  the Executive will
not accept employment nor engage in business,  directly or indirectly, as a sole
proprietor,  member of a  partnership,  stockholder  or  investor  (other than a
stockholder or investor owning not more than a 5% interest), officer or director
of a  corporation,  or as an employee,  associate,  consultant  or agent for any
person, partnership,  corporation or other business organization or entity other
than  MEMC or any of its  subsidiaries  which  competes  with MEMC  without  the
express written consent of MEMC. In addition,  the terms of the  confidentiality
agreement  dated March,  1989 between MEMC and the  Executive  are  incorporated
herein by reference. Notwithstanding anything contained in this Section 5 to the
contrary,  the period of  applicability  of this  Section 5 shall be extended an
additional  day for each day on which the Executive is in breach of this Section
5.

     5.2 Injunctive Relief. Without intending to limit the remedies available to
the  parties  hereto,  the  parties  acknowledge  that  a  breach  of any of the
covenants  contained in this  Section 5 may result in material  and  irreparable
injury to MEMC for which there is no adequate remedy at law, that it will not be
possible to measure  damages for such injuries  precisely and that, in the event
of such a breach or threat  thereof,  MEMC shall be entitled to seek a temporary
restraining order and/or a preliminary or permanent  injunction  restraining the
Executive from engaging in activities prohibited by this Section 5 or such other
relief as may be required  specifically  to enforce any of the covenants in this
Section  5. If,  for any  reason,  it is held that the  restrictions  under this
Section 5 are not reasonable or that consideration therefor is inadequate,  such
restrictions shall be interpreted or modified to include as much of the duration
and scope  identified in this Section 5 as will render such  restrictions  valid
and enforceable.

     6. Successors. MEMC will require any successor (whether direct or indirect,
by purchase, merger,  consolidation or otherwise) to all or substantially all of
the business and/or assets of MEMC to expressly assume and agree to perform this
Agreement  in the same manner and to the same extent that MEMC would be required
to perform it if no such  succession had taken place. As used in this Agreement,
"MEMC" shall mean MEMC as defined above and any successor to its business and/or
assets which by reason  hereof  assumes and agrees to perform this  Agreement by
operation of law, or otherwise.

     7. Miscellaneous.

     7.1 Severability.  Each provision of this Agreement shall be interpreted in
such  manner as to be  effective  and valid  under  applicable  law,  but if any
provision  of this  Agreement  is  held to be  prohibited  by or  invalid  under
applicable  law, such provision  will be ineffective  only to the extent of such
prohibition or invalidity,  without invalidating the remainder of such provision
or the remaining provisions of this Agreement.

     7.2 Disputes.  Any disputes  between the parties to this Agreement shall be
settled by  arbitration  in St.  Louis,  Missouri  under the auspices of, and in
accordance with the rules of, the American Arbitration Association. The decision
in such  arbitration  shall be final and  conclusive on the parties and judgment
upon such decision may be entered in any court having jurisdiction thereof.

     7.3 Entire Agreement: Amendment.

          (i) Except as expressly set forth herein,  this  Agreement  represents
     the entire  agreement of the parties  concerning  the subject matter hereof
     and  shall  supersede  any  and all  previous  contracts,  arrangements  or
     understandings between MEMC and the Executive.

          (ii) This  Agreement  may be  amended  at any time by  mutual  written
     agreement of the parties hereto.

     7.4 Withholding. The payment of any amount pursuant to this Agreement shall
be  subject  to  applicable  withholding  and  payroll  taxes,  and  such  other
deductions as may be required under MEMC's employee benefit plans, if any.

     7.5  Governing  Law. This  Agreement  shall be governed by and construed in
accordance with the laws of the State of Missouri.

     The parties have executed this Agreement as of the day and year first above
written.

                                         MEMC Electronic Materials, Inc.

/s/ Robert M. Sandfort                   By: /s/ Ludger H. Viefhues
- --------------------------------             -----------------------------------
Robert M. Sandfort                           Chairman of the Board

[                              ]



                                   Schedule 1

                          Current Compensation Program



o    Annual Base Salary - USD $310,000 per annum

o    1995 Incentive  Program Target  Incentive  Opportunity as a percent of base
     salary - Annual Incentive Target/Maximum Opportunity; 30%/66%

o    Grants of Stock Options and Performance Contingent Vesting Restricted Stock
     in connection with the IPO

o    Participation  in any Long Term  Incentive Plan (expected to be established
     by MEMC on or after January 1, 1996)



     STOCK OPTIONS                                      RESTRICTED STOCK
- -----------------------                          ------------------------------
72,364  Options  at IPO price  which             24,000  shares of Restricted
vest at the rate of 25% per year,                Stock which vest 100% (i.e.,
such that 100% vesting will occur on             all forfeiture  restrictions
the fourth anniversary of the IPO                lapse) on the fourth anniver-
Date. (1) ("Ratable  Vesting  Options")          sary of the IPO Date.
                                                 ("Performance Vesting 
                                                 Restricted  Stock").  However,
                                                 if, at any time during the
                                                 first 3  years,  the common
                                                 stock  share appreciation is
                                                 greater   than   55% from the
                                                 IPO  price, 50% of the
                                                 Performance  Vesting
                                                 Restricted Stock will become
                                                 fully vested.  If such share
72,364  Options at IPO price which               appreciation is greater than
vest 100% on the fourth anniversary              100%, then all Performance
of the IPO Date.  ("Cliff Vesting                Vesting Restricted Stock will
Options")                                        become fully vested.

                                                 24,000 shares of Restricted
                                                 Stock which vest 100% on fourth
                                                 anniversary of the IPO Date.
                                                 ("Cliff Vesting Restricted
                                                 Stock")


- ---------------
(1)  The number of shares  representing  .171% of  outstanding  stock on a fully
     diluted  basis is  assumed  to be 72,364  shares.  If the IPO  results in a
     different  number of shares equaling .171% of outstanding  stock on a fully
     diluted basis, the Executive shall receive, for each of the Ratable Vesting
     and Cliff Vesting Option  grants,  the greater of 72,364 shares or .171% of
     outstanding  stock on a fully  diluted  basis.  The number of both  Ratable
     Vesting and Cliff Vesting Restricted Stock shares referenced granted to the
     Executive will also be determined in this manner.

Performance  Vesting Restricted Stock, Cliff Vesting Options,  and Cliff Vesting
Restricted  Stock will be forfeited  and  cancelled,  if the  employment  of the
Executive  is  terminated  for Cause or due to his option to retire prior to the
fourth anniversary of the IPO Date.