BY-LAWS

                                       OF

                         MEMC ELECTRONIC MATERIALS, INC.

                          (Restated as of May 6, 1999)


                                    ARTICLE I

                                     Offices

     Section 1. Offices.  The registered  office of MEMC  Electronic  Materials,
Inc. (hereinafter called the Corporation) shall be in the State of Delaware. The
Corporation  may have  offices and places of business at such places  within and
without the State of Delaware as shall be  determined by the Board of Directors.
The books of the  Corporation  may be kept  outside of the State of  Delaware at
such place or places as the Board of Directors may from time to time determine.


                                   ARTICLE II

                                  Stockholders

     Section 1. Place of  Meetings.  All meetings of the  stockholders  shall be
held at such place within or without the State of Delaware as is  designated  by
the Board of Directors.

     Section 2. Annual  Meeting.  The Board of Directors  shall fix the time and
place of the annual meeting of the  stockholders for the purpose of electing the
directors  and for the  transaction  of such other  business as may  properly be
brought before the meeting.

     Section 3. Special  Meeting.  Special  meetings of the  stockholders may be
called by a majority of the holders of the common stock of the Corporation or by
a majority of the Board of Directors or by the Chairman of the Board.

     Section 4.  Notice of  Meetings.  Except as is  otherwise  provided by law,
notice of each  meeting of  stockholders,  whether  annual or special,  shall be
given to each  stockholder  not less than 10 nor more than 60 days  prior to the
meeting.  The notice  shall  state the date,  time and place and, in the case of
special  meetings,  the  purpose  or  purposes  of such  meeting,  and at  whose
direction the notice is given.

     Section 5.  Quorum.  At all meetings of  stockholders,  except as otherwise
required  by statute,  the holders of a majority of the shares  entitled to vote
thereat,  present  in person  or by proxy,  shall  constitute  a quorum  for the
transaction  of  business.  If,  however,  such  quorum  shall not be present or
represented at any meeting of the  stockholders,  the  stockholders  entitled to
vote  thereat may adjourn  such  meeting  from time to time in  accordance  with
Section  7 of this  Article  II of  these  By-Laws  until  the  number  of votes
requisite to constitute a quorum shall be present.

     Section 6. Voting.  When a quorum is present or represented by proxy at any
meeting  of  stockholders,  the  vote  of  the  holders  of a  majority  of  the
outstanding  shares of stock  entitled to vote  thereat  present in person or by
proxy shall decide any question brought before such meeting, unless the question
is one upon which an express  provision  of the General  Corporation  Law of the
State of Delaware or of the Restated  Certificate  of  Incorporation  requires a
greater vote, in which case such provision shall control.

     Each  stockholder  entitled to vote at any meeting may vote in person or by
proxy and shall,  unless the  Restated  Certificate  of  Incorporation  provides
otherwise,  have one vote for each share of stock registered in his name, but no
proxy shall be valid after three years from its date,  unless the proxy provides
for a longer period.

     Section 7. Adjourned Meetings. Any meeting of stockholders may be adjourned
to a  designated  time and  place by a vote of a  majority  in  interest  of the
stockholders present in person or by proxy, even though less than a quorum is so
present. No notice of such an adjourned meeting needs to be given, other than by
announcement at the meeting, and any business may be transacted which might have
been transacted at the meeting as originally called; provided,  however, that if
the  adjournment  is for more than 30 days,  or if after the  adjournment  a new
record  date is fixed  for the  adjourned  meeting,  a notice  of the  adjourned
meeting  shall be given to each  stockholder  of record  entitled to vote at the
adjourned meeting.

     Section 8. Action Without  Meeting.  Any action required or permitted to be
taken at any annual or special  meeting of  stockholders  may be taken without a
meeting,  without  prior notice and without a vote,  if a consent or consents in
writing,  setting  forth the action so taken,  shall be signed by the holders of
all the  outstanding  stock entitled to vote thereon.  The effective date of the
authorization of such action shall be deemed to be the date of the filing of the
last such  written  consent in the minute books of the  Corporation,  which date
shall be noted therein by the Secretary.

     Section 9. Advance Notice of Business to Be Transacted at Annual  Meetings.
To be properly brought before the annual meeting of stockholders,  business must
be either (a)  specified  in the notice of meeting (or any  supplement  thereto)
given by or at the direction of the Board of Directors  (or any duly  authorized
committee  thereof),  (b) otherwise properly brought before the meeting by or at
the  direction  of the  Board of  Directors  (or any duly  authorized  committee
thereof) or (c) otherwise properly brought before the meeting by any stockholder
of the  Corporation (i) who is a stockholder of record on the date of the giving
of the notice  provided  for in this  Section 9 and on the  record  date for the
determination  of  stockholders  entitled  to vote at such  meeting and (ii) who
complies with the notice  procedures set forth in this Section 9. In addition to
any other applicable requirements, including but not limited to the requirements
of Rule 14a-8  promulgated by the Securities and Exchange  Commission  under the
Securities  Exchange Act of 1934, as amended (the "Exchange  Act"), for business
to  be  properly  brought  before  an  annual  meeting  by a  stockholder,  such
stockholder  must have given timely notice thereof in proper written form to the
Secretary of the Corporation.

     To be timely, a stockholder's  notice to the Secretary must be delivered to
or mailed and received at the principal  executive  offices of the  Corporation,
not less than 90 days nor more than 120 days  prior to the  anniversary  date of
the immediately  preceding  annual meeting of stockholders;  provided,  however,
that in the event  that the  annual  meeting  is  called  for a date that is not
within 30 days  before or after such  anniversary  date,  in order to be timely,
notice  by the  stockholder  must be so  received  not  later  than the close of
business on the tenth day  following  the day on which notice of the date of the
annual meeting is mailed to stockholders or public disclosure of the date of the
annual meeting is made, whichever first occurs. The provisions of this Section 9
shall also govern what  constitutes  timely notice for purposes of Rule 14a-4(c)
under the Exchange Act.

     To be in proper written form, a stockholder's  notice to the Secretary must
set forth as to each matter such stockholder proposes to bring before the annual
meeting (a) a brief description of the business desired to be brought before the
meeting and the reasons for  conducting  such  business at the meeting,  (b) the
name and record address of such stockholder,  (c) the class or series and number
of shares of capital stock of the Corporation which are owned beneficially or of
record by such stockholder,  together with evidence  reasonably  satisfactory to
the  Secretary  of  such  beneficial   ownership,   (d)  a  description  of  all
arrangements or understandings  between such stockholder and any other person or
persons (including their names) in connection with the proposal of such business
by such  stockholder  and any  material  interest  of such  stockholder  in such
business and (e) a  representation  that such  stockholder  intends to appear in
person or by proxy at the  annual  meeting  to bring  such  business  before the
meeting.

     Notwithstanding  anything  in these  By-Laws to the  contrary,  no business
shall be conducted at the annual meeting of stockholders except business brought
before such meeting in accordance  with the procedures set forth in this Section
9; provided,  however, that, once business has been properly brought before such
meeting in accordance with such  procedures,  nothing in this Section 9 shall be
deemed to preclude  discussion by any  stockholder of any such business.  If the
chairman of such meeting  determines  that  business  was not  properly  brought
before the meeting in  accordance  with the foregoing  procedures,  the chairman
shall declare to the meeting that the business was not properly  brought  before
the meeting and such business shall not be transacted.


                                   ARTICLE III

                                    Directors

     Section 1. Management of the  Corporation.  The business and affairs of the
Corporation  shall  be  managed  by or  under  the  direction  of the  Board  of
Directors.  The  officers of the  Corporation  shall keep the Board of Directors
fully  informed  about the  affairs of the  Corporation,  and the  officers  and
employees of the  Corporation  shall  provide the Board of  Directors  with such
written or oral  reports  and  information  as the Board of  Directors  may deem
advisable.

     Section 2.  Number and Term of Office.  Subject to the  rights,  if any, of
holders of preferred stock of the Corporation,  the number of directors shall be
determined from time to time by resolution  passed by a majority of the Board of
Directors  of the  Corporation,  but in no event  shall the  Board of  Directors
consist of less than five or more than 15 directors.  The number of directors so
determined is referred to in these  By-Laws as the "total number of  directors".
The Board of Directors shall, by resolution passed by a majority of the Board of
Directors,  designate  the  directors to serve as initial  Class I, Class II and
Class III directors upon filing of the Restated  Certificate of Incorporation of
the Corporation with the Secretary of State of the State of Delaware.  Except as
provided  in  Section 5 of this  Article  III,  directors  shall be elected by a
plurality  of the  votes  cast at  annual  meetings  of  stockholders,  and each
director  so  elected  shall hold  office as  provided  by Article  Fifth of the
Restated Certificate of Incorporation of the Corporation.  Directors need not be
stockholders of the Corporation.

     Section 3. Nomination of Directors and Advance Notice Thereof. Only persons
who are nominated in accordance with the Restated  Certificate of  Incorporation
of  the  Corporation  shall  be  eligible  for  election  as  directors  of  the
Corporation.

     Section  4.  Resignation.  Any  director  may  resign  at  any  time.  Such
resignation shall be made in writing and shall take effect at the time specified
therein  or, if no time be  specified,  at the time of its  receipt by the Chief
Executive   Officer  (the  "CEO"),   the  President  or  the  Secretary  of  the
Corporation.  The acceptance of a resignation  shall not be necessary to make it
effective.

     Section 5. Vacancies.  Subject to the rights, if any, of the holders of any
series  of  preferred  stock  then  outstanding,  any  vacancy  on the  Board of
Directors arising from death, resignation, removal, an increase in the number of
directors or any other  cause,  may be filled  either by a majority  vote of the
remaining  directors,  although  less  than a quorum,  or by the sole  remaining
director; provided, however, that if any director then in office determines that
any such vacancy on the Board of Directors shall be filled by the  stockholders,
such vacancy shall be filled by the stockholders in accordance with the Restated
Certificate of Incorporation.  Any director elected to fill a vacancy shall hold
office for a term that shall  coincide  with the term of the class to which such
director shall have been elected.

     Section 6. Regular Meetings. The Board of Directors shall hold at least two
regular meetings during each calendar year on such dates as may be determined by
the Board of Directors. Such regular meetings may be held at such places, either
within  or  without  the  State  of  Delaware,  as  shall  from  time to time be
determined by the Board of Directors.

     Section 7. Special Meetings. Special meetings of the Board of Directors may
be called by the Chairman of the Board,  the CEO or the President,  and shall be
called by the CEO, the President or the Secretary,  upon the written  request of
at least two members of the Board of Directors.  Each director shall be given 10
days' notice of each such meeting.

     Section  8.  Fees.  Each  member  of the Board of  Directors  who is not an
officer of the Corporation  shall receive from the Corporation an annual fee for
serving  on the  Board  of  Directors  and an  annual  fee for  serving  on each
committee of the Board of Directors on which such  director  serves,  plus a fee
for each  meeting  of the Board of  Directors  he  attends,  plus a fee for each
meeting of a committee of the Board of Directors he attends.  The amount of such
fees shall be determined  from time to time by a majority of the total number of
directors.  Each director,  including those who are also officers, shall receive
from the  Corporation  reimbursement  of travel expenses for each meeting of the
Board of Directors or any committee thereof he attends.

     Section 9. Quorum.  A quorum of directors for the  transaction  of business
shall consist of at least a majority of the total number of directors.

     Section 10. Waiver of Notice.  Notice of a meeting need not be given to any
director  who submits a written  waiver of such notice,  signed by him,  whether
before or after such meeting.  Neither the business to be transacted at, nor the
purpose of, any meeting of the directors need be specified in any written waiver
of notice with respect to such  meeting.  Attendance  of a director at a meeting
shall  constitute a waiver of notice of such  meeting,  except when the director
attends such meeting for the express  purpose of objecting,  at the beginning of
such  meeting,  to the  transaction  of any business  because the meeting is not
lawfully called or convened.

     Section 11. Voting.  The act of a majority of the total number of directors
shall be the act of the Board of Directors.

     Section 12.  Meetings via  Conference  Call. Any one or more members of the
Board of Directors or any committee  thereof may participate in a meeting of the
Board of Directors or such committee by means of a conference  telephone call or
similar  communications  equipment hook-up allowing all persons participating in
the  meeting  to hear each other at the same  time.  Participation  by such mean
shall constitute presence in person at a meeting.

     Section 13. Action Without Meeting. Notwithstanding any other provisions of
these  By-Laws,  any action  required or permitted to be taken at any meeting of
the Board of Directors or any committee  thereof may be taken without a meeting,
if a written consent or consents to the adoption of a resolution authorizing the
action is signed by the whole  Board of the  Corporation  or all the  members of
such  committee,  as the case may be. The  resolution  and the written  consents
thereto  shall be filed  with the  minutes  of the  proceedings  of the Board of
Directors.

     Section 14. Committees. (a) Audit Committee;  Compensation Committee; Other
Committees.  The Board of Directors  shall  designate an Audit  Committee  and a
Compensation  Committee,  each  consisting of at least two directors and to have
such duties and functions as shall be specified in the resolution or resolutions
appointing such committees.  The Board of Directors,  by resolution  passed by a
majority of the total number of directors, may designate other committees of the
Board of Directors,  each such committee to consist of two or more directors and
to have such duties and functions as shall be provided in such resolution.

     (b) Rules of Committees.  A majority of all of the members of any committee
of the Board of Directors may  determine  its rules of procedure,  determine its
action  and fix the time and  place,  whether  within  or  without  the State of
Delaware,  of its  meetings and specify what notice  thereof,  if any,  shall be
given, unless the Board of Directors shall otherwise by resolution provide. Each
committee  shall record minutes of its  proceedings and shall submit the same to
the Board of  Directors.  The Board of Directors  shall have power to change the
members of any such  committee and fill  vacancies  therein and to discharge any
such committee, either with or without cause, at any time.

     (c) Powers of Committees. The Board of Directors, by resolution passed by a
majority of a duly constituted  quorum of the Board of Directors,  may designate
committees of the Board of Directors pursuant to, and which will have the powers
as are  consistent  with,  the  provisions of Section  141(c)(2) of the Delaware
General Corporation Law.

     Section 15. The Chairman of the Board and Vice  Chairman of the Board.  The
Chairman of the Board and, if the Board of Directors  determines  that the Board
should  have a Vice  Chairman,  the Vice  Chairman of the Board shall be elected
annually by the Board of  Directors.  The Chairman of the Board shall preside at
all  meetings of the Board of  Directors,  act as  chairman  at all  meetings of
stockholders  and shall sign the  minutes of the  proceedings  recorded  at such
meetings by the  Secretary.  He shall make  reports to the Board of Directors as
well as to the  stockholders and shall perform all duties incident to his office
or properly required of him by the Board of Directors. The Chairman of the Board
and the Vice  Chairman of the Board shall each perform  such further  duties and
exercise such further  powers as may be assigned to him from time to time by the
Board of  Directors.  In the  absence of the  Chairman  of the  Board,  the Vice
Chairman of the Board shall carry out his duties and authorities.


                                   ARTICLE IV

                                    Officers

     Section 1.  Officers.  The officers of the  Corporation  shall  include the
Chief  Executive  Officer,  the  President,  a Treasurer  and a Secretary.  Each
officer of the Corporation shall hold office until his successor shall have been
duly chosen and qualified, or until his death, disqualification,  resignation or
removal.  Except for the offices of  President  and  Secretary,  any two or more
offices may be held by one person.  Any vacancy occurring in any office shall be
filled by the Board of Directors.

     Section 2. Other  Officers.  The Board of Directors may appoint one or more
Vice  Presidents,  Assistant  Treasurers,  Assistant  Secretaries and such other
officers and agents with such powers and duties as it shall deem necessary.

     Section 3. The Chief  Executive  Officer (the "CEO").  The Chief  Executive
Officer, subject to the direction of the Board of Directors,  shall have general
management and control of the business and affairs of the Corporation.

     Section  4. The  President.  The  President  shall be the  Chief  Operating
Officer of the  Corporation  and,  subject to the  direction  of the CEO and the
Board of Directors,  shall be responsible  for the day-to-day  management of the
Corporation.

     Section 5. The  Treasurer.  The Treasurer  shall have custody of all funds,
securities and evidences of indebtedness of the  Corporation,  shall receive and
give receipts and acquittances for monies paid in on account of the Corporation,
shall pay out of the funds on hand all bills,  payrolls, and other just debts of
the  Corporation,  of whatever  nature upon maturity,  shall enter  regularly in
books to be kept by him for that  purpose,  full and  accurate  accounts  of all
monies  received  and paid out by him on account of the  Corporation,  and shall
perform  all other  duties  incident  to the Office of  Treasurer  and as may be
prescribed by the Board of Directors.

     Section 6. The Secretary. The Secretary, if he shall be present, shall keep
the minutes of all proceedings of directors and  stockholders,  and shall attend
to the giving and serving of all notices to stockholders  and directors or other
notices  required  by law or by  these  By-Laws,  shall  affix  the  seal of the
Corporation to deeds,  contracts and other  instruments  in writing  requiring a
seal when duly signed or when so ordered by the Board of  Directors,  shall have
charge of the minute  books,  certificate  books and stock  books and such other
books and papers as the Board of  Directors  may direct,  and shall  perform all
other duties incident to the office of Secretary.

     Section 7.  Removal of  Officers.  Any  officer of the  Corporation  may be
removed  from  office  at any  time,  with or  without  cause,  by a vote of the
majority of the total number of directors.


                                    ARTICLE V

                                  Capital Stock

     Section  1.  Form  and  Execution  of  Certificates.   The  shares  of  the
Corporation  shall be represented by certificates in such form as is required by
the General  Corporation Law of the State of Delaware and as shall be adopted by
the Board of  Directors.  Certificates  shall be numbered and  registered in the
order issued,  shall be signed by the  President or a Vice  President and by the
Secretary or the  Treasurer  and sealed with the  corporate  seal or a facsimile
thereof.

     Section 2.  Transfer.  Transfer of shares shall be made only upon the books
of the  Corporation  by the  registered  holder  thereof  or by  attorney,  duly
authorized,  and upon  surrender of the  certificate  or  certificates  for such
shares properly assigned for transfer.

     Section 3. Lost or Destroyed  Certificates.  The holder of any  certificate
representing  shares of stock of the  Corporation  may notify the Corporation of
any  loss,  theft,  or  destruction  thereof,  and the  Board of  Directors  may
thereupon,   in  its  discretion  (subject  to  applicable  law),  cause  a  new
certificate  for the same  number of shares  to be  issued to such  holder  upon
satisfactory  proof of such loss, theft or destruction,  and, if required by the
Board of  Directors,  the deposit of indemnity by way of bond or  otherwise,  in
such form and amount and with such surety or sureties as the Board of  Directors
may require, to indemnify the Corporation against loss or liability by reason of
the issuance of such new certificates.

     Section 4. Record Date. The Board of Directors may fix, in advance, a date,
not  exceeding  60 days  nor  less  than 10  days,  as the  record  date for the
determination of stockholders  entitled to receive notice of, or to vote at, any
meeting of stockholders, or to consent to any proposal without a meeting, or for
the  purpose of  determining  stockholders  entitled  to receive  payment of any
dividends, or allotment of any rights, or for the purpose of any other action.


                                   ARTICLE VI

                                  Miscellaneous

     Section 1.  Dividends  and  Reserves.  The Board of  Directors  may declare
dividends and may set apart out of any of the funds of the Corporation available
for  dividends  a reserve or reserves  for any proper  purpose and may reduce or
eliminate  any such reserve.  Dividends may be paid in cash, in property,  or in
shares of stock.

     Section  2.  Regulations.  The Board of  Directors  may make such rules and
regulations as it may deem expedient concerning the transfer and registration of
certificates for shares of the Corporation.

     Section 3. Corporate Seal. The corporate seal shall have inscribed  thereon
the name of the Corporation and the words "CORPORATE SEAL", and the state of its
incorporation.

     Section 4. Notice and Waiver of Notice.  Whenever  under the  provisions of
these By-Laws any notice is required to be given, such notice,  unless otherwise
required  by law or by  these  By-Laws,  shall  be  communicated  to the  person
entitled thereto be courier mail or first-class  mail,  postage  prepaid,  or by
telegraph,  telex, cable, facsimile or other recorded form of transmission,  and
such  notice  shall be deemed to have been given on the third day after the time
of dispatch by courier mail or mailing thereof or at the time of dispatch in the
case of notice by any other  form of  transmission.  Any notice  required  to be
given  under  these  By-Laws  may be waived in writing  by the  person  entitled
thereto, whether before or after the time stated therein.

     Section  5.  Fiscal  Year.  The  fiscal  year of the  Corporation  shall be
determined by resolution of the Board of Directors.


                                   ARTICLE VII

                                   Amendments

     Section 1. Amendments. The Board of Directors shall have the power, without
assent or vote of the stockholders,  to make, alter,  amend,  change,  add to or
repeal  these  By-Laws,  or any of them,  upon a vote of a majority of the total
number of directors.