MEMC ELECTRONIC MATERIALS, INC.

                       SEVERANCE PLAN FOR SENIOR OFFICERS

Objectives: (1)Assure key executives of fair and equitable treatment in cases of
involuntary  termination,  (2) aid in attracting  and  retaining key  executives
during an uncertain period, while avoiding the need for individual  negotiations
and the  potential  inequities  that  could  arise,  and (3) treat  terminations
uniformly,  whether  or not in  connection  with a change  in  control,  thereby
avoiding  any  concern  which  would  arise if the plan was only for  change  in
control situations.

Vehicle for Providing Severance  Protection:  Severance Plan for Senior Officers
(not individual contracts),  adopted in writing by the Board of Directors,  with
individuals  covered by the plan  designated  in  writing  and  approved  by the
Compensation Committee.  Covered executives will receive written notice of their
designation and a copy of the Plan signed by the Corporate Vice President, Human
Resources.

Nature of  Contract:  This Plan  provides  for  severance  payments  to eligible
employees  in the  amounts  and in the  circumstances  described  in this  Plan.
Nothing contained in this Plan shall be construed to be a contract of employment
for any term,  nor shall the  provisions of this Plan restrict the right of MEMC
Electronic  Materials,  Inc.  ("MEMC") to  discharge  an eligible  employee,  or
restrict the right of an eligible  employee to terminate his or her  employment.
This Plan relates  exclusively to additional  compensation for services rendered
in certain limited circumstances explicitly described in this Plan.

Eligibility:  Those Corporate and Executive Vice Presidents reporting to the CEO
who are designated in writing and approved by the  Compensation  Committee shall
be eligible to participate in this Plan. Covered executives will receive written
notice of their designation.

Duration of Severance Protection: This Severance Plan shall remain in effect for
three years from the date of its adoption,  and shall be  automatically  renewed
annually  thereafter,  unless  twelve  months  advance  notice  is  given to the
affected covered executive to amend or terminate the plan.  Notwithstanding  the
above,  this Plan  shall  remain in effect for two years  following  a Change in
Control, after which time the Plan shall terminate.

An  employee  may be  removed  from  coverage  in this Plan by the  Compensation
Committee only by twelve months advance written notice to the employee; provided
that an employee who is an eligible  employee at the time of a Change in Control
shall remain covered by this Plan for at least two years following the Change in
Control.

A Change in  Control  ("CIC"),  for  purposes  of this  Plan,  means a change in
control as defined in the MEMC Electronic Materials, Inc. Equity Incentive Plan,
as Restated  March 18, 1997;  except that the  parenthetical  exception  for the
acquisition  of all of the Common Stock  pursuant to approval of the  Continuing
Directors shall not apply.

Types of terminations Which Trigger Severance  Benefits:  MEMC shall provide the
severance benefits described below in the event of an Involuntary Termination of
employment  (other than a Termination  for Cause) of an eligible  employee while
covered  by this  Plan,  or in the  event  of the  Constructive  Termination  of
employment of an eligible  employee  while covered by this Plan within two years
after a CIC.

An  employee  shall not be  entitled to  severance  benefits  under this Plan on
account of death,  total and permanent  disability,  a Voluntary  Termination of
employment,  or a Termination for Cause.  Furthermore,  an employee shall not be
entitled to  severance  benefits  under this Plan on account of  termination  of
employment  with  MEMC as a result  of a sale or  spin-off  of a  subsidiary  or
business unit if (1) the executive is offered continued employment with the sold
or spun-off entity that does not result in: a material, adverse change in title,
responsibilities  or  reporting   relationship;   an  adverse  change  in  total
compensation opportunity unless part of a cutback applicable to a broad class of
management  employees;  or a  forced  relocation  more  than 25  miles  from the
executive's  pre-CIC MEMC office  location;  and (2) the purchaser enters into a
severance  agreement  with the  executive  that provides  substantially  similar
benefits as this Plan for a period of at least two years after such transaction.

Definitions:

A Voluntary  Termination of employment  means a termination  of employment  with
MEMC  resulting  solely  from  the  initiative  of the  employee  without  undue
influence,  coercion or duress on the employee  caused by MEMC. A resignation by
an employee which is an  alternative  to immediate  termination by MEMC is not a
Voluntary Termination.

An  Involuntary  Termination  is a  termination  of  employment  that  is  not a
Voluntary Termination as defined above.

A Constructive Termination after a CIC means a

(1)  Material,   adverse   change  in  title,   responsibilities   or  reporting
     relationship,

(2)  Adverse change in total  compensation  opportunity unless part of a cutback
     applicable to a broad class of management employees,

(3)  Forced  relocation  more than 25 miles from the  executive's  pre-CIC  MEMC
     office location, or

(4)  Failure  of the new  owner  to  honor  the  Plan or the  aspects  of a sale
     agreement relating to employment matters

within two years after a CIC.

An  eligible  employee  must  file  written  notice  of such an  event  with the
Corporate Vice President,  Human  Resources  within thirty days of the event. If
MEMC does not rectify the event within thirty days after receipt of such notice,
the employee may quit and receive severance benefits.

Termination  for Cause means the  Involuntary  Termination  of  employment of an
employee because of:

(1)  Dishonesty that results in a material detriment to MEMC;

(2)  The intentional subversion of MEMC's best interests; or

(3)  Insubordination  with respect to a specific  directive or resolution of the
     CEO or the Board of Directors.

Severance Benefits:

The  severance  benefits  under this Plan shall  consist of the  following  four
components:

Cash  Compensation:  The  greater of (1) one year's base salary in effect at the
time of  termination  of  employment  (with no  payment  for  accrued  or unused
vacation), or (2) two week's of such salary for each Year of Service (as defined
in the  Supplemental  Executive  Pension Plan ("SEPP") for purposes of vesting),
plus one week, plus accrued and unused vacation. In addition, the executive will
receive a pro rata bonus payment for the year of termination based on the number
of days in such year  before the date of  termination  of  employment.  The base
bonus for purposes of such  proration  shall be  determined  based on the actual
level of  achievement  of the relevant  goals.  However,  if the  termination of
employment  occurs  within two years  after a CIC,  such pro rata bonus shall be
based on the full targeted level (without  regard to the  achievement of goals);
and, in addition to such pro rata bonus,  the  executive  will receive a payment
equal to the  bonus to which the  executive  would be  entitled  for the year of
termination at the full targeted level.

The  salary-based  portion of such  severance  payment shall be paid in a single
lump sum, net of applicable taxes, within thirty days of termination.  The bonus
portion of such severance  payment  generally  shall be paid at the same time as
bonuses are paid generally to executives with respect to that year. However, the
bonus  portion of such  severance  payment  due on account of a  termination  of
employment  within two years  after a CIC shall be paid  within  thirty  days of
termination.

Stock Options:  Outstanding stock options will be treated according to the terms
of their award letter;  provided  that, if a  termination  of employment  occurs
subsequent to and within two years of a CIC which triggers  severance  benefits,
the  executive  will be deemed to have  retired for purposes of the stock option
awards.

Retirement  Benefits:  Notwithstanding  anything to the contrary in the SEPP for
purposes of  determining  benefits  under the SEPP, the period of severance with
respect  to which  severance  pay was  determined  shall be  treated  as Benefit
Service.  Payments from the SEPP shall not commence until such severance  period
has lapsed. However, Average Total Earnings shall be determined as of the actual
termination of employment of the employee.

Medical  Benefits:  If an employee  eligible for such severance  payments is not
eligible  for  MEMC  retiree  medical  benefits  at  termination  of  his or her
employment,  MEMC will pay the executive the grossed up cost of eighteen  months
COBRA  premiums  for medical and dental  coverage for the same level of coverage
that the executive is enrolled immediately prior to termination.

If an employee eligible for such severance payments is eligible for MEMC retiree
medical  benefits at  termination  of his or her  employment,  MEMC will pay the
executive the grossed up cost of eighteen  months COBRA premiums only for dental
coverage  for the  same  level  of  coverage  that  the  executive  is  enrolled
immediately prior to termination.

All other coverage will be terminated as of the  termination  date in accordance
with the terms of the applicable plan.

Severance  benefits  under this Plan shall be in lieu of any severance  benefits
under any other severance plan or policy of MEMC.

Amendment and Termination:

Subject to the initial three year duration period  described above, the Board of
Directors  may amend or terminate  this Plan at any time;  except that,  for any
amendment or termination that adversely affects a covered executive,  a one-year
notice shall be given to such  employee.  In the event a CIC occurs  during that
notice  period,  the intended  change shall be  suspended.  Notwithstanding  the
above,  this Plan  shall  remain in effect for two years  following  a Change in
Control, after which time it shall terminate.

Release:  If the  benefits  under this Plan are invoked as a result of an action
that is not following a CIC, the  executive  will be obligated to sign a release
acceptable to MEMC in order to receive payment. In the event of benefits invoked
as a result of a CIC, no release will be required for benefits to be paid.

Arbitration: 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. The employer will pay the full
cost of the arbitration.