<PAGE>

                                                       Adopted on March 15, 1999

                              AMENDED AND RESTATED
                                     BY-LAWS
                                       OF
                                W. R. GRACE & CO.

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE


                                    ARTICLE I
                               OFFICES AND RECORDS

         Section 1.1. Delaware Office. The principal office of the Corporation
in the State of Delaware shall be located in Wilmington, Delaware, and the name
and address of its registered agent is The Prentice-Hall Corporation System,
Inc., 1013 Centre Road, Wilmington, Delaware.

         Section 1.2. Other Offices. The Corporation may have such other
offices, either within or without the State of Delaware, as the Board of
Directors may designate or as the business of the Corporation may from time to
time require.

         Section 1.3. Books and Records. The books and records of the
Corporation may be kept outside the State of Delaware at such place or places as
may from time to time be designated by the Board of Directors.


                                   ARTICLE II
                                  STOCKHOLDERS

         Section 2.1. Annual Meeting. The annual meeting of the stockholders of
the Corporation shall be held annually (a) on the tenth day of May, or (b) if
such day be a Saturday, Sunday or a holiday at the place where the meeting is to
be held, on the last business day preceding or on the first business day after
such tenth day of May, as may be fixed by the Board of Directors, or (c) on such
other date as may be fixed by the Board of Directors.

         Section 2.2. Special Meeting. Subject to the rights of the holders of
any series of stock having a preference over the Common Stock of the Corporation
as to dividends or upon liquidation ("Preferred Stock") with respect to such
series of Preferred Stock, special meetings of the stockholders may be called
only by the Chairman, by the President or by the Board of Directors pursuant to
a resolution adopted by a majority of the total number of directors which the
Corporation would have if there were no vacancies (the "Whole Board").


<PAGE>



         Section 2.3. Place of Meeting. The Chairman, the President or the Board
of Directors, as the case may be, may designate the place of meeting for any
annual meeting or for any special meeting of the stockholders called by the
Chairman, the President or the Board of Directors. If no designation is so made,
the place of meeting shall be the principal office of the Corporation.

         Section 2.4. Notice of Meeting. Written or printed notice, stating the
place, date and time of the meeting and the purpose or purposes for which the
meeting is called, shall be delivered by the Corporation not less than ten (10)
days nor more than sixty (60) days before the date of the meeting, either
personally or by mail, to each stockholder of record entitled to vote at such
meeting. If mailed, such notice shall be deemed to be delivered when deposited
in the U.S. mail with postage thereon prepaid, addressed to the stockholder at
his address as it appears on the stock transfer books of the Corporation. Such
further notice shall be given as may be required by law. Only such business
shall be conducted at a special meeting of stockholders as shall have been
brought before the meeting pursuant to the Corporation's notice of meeting.
Meetings may be held without notice if all stockholders entitled to vote are
present, or if notice is waived by those not present in accordance with Section
6.4 of these By-laws. Any previously scheduled meeting of the stockholders may
be postponed, and (unless the Certificate of Incorporation otherwise provides)
any special meeting of the stockholders may be cancelled, by resolution of the
Board of Directors upon public notice given prior to the date previously
scheduled for such meeting of stockholders.

         Section 2.5. Quorum and Adjournment. Except as otherwise provided by
law or by the Certificate of Incorporation, the holders of a majority of the
outstanding shares of the Corporation entitled to vote generally in the election
of directors (the "Voting Stock"), represented in person or by proxy, shall
constitute a quorum at a meeting of stockholders, except that when specified
business is to be voted on by a class or series of stock voting as a class, the
holders of a majority of the voting power of the shares of such class or series
shall constitute a quorum of such class or series for the transaction of such
business. The chairman of the meeting or a majority of the shares so represented
may adjourn the meeting from time to time, whether or not there is a quorum. No
notice of the time and place of adjourned meetings need be given except as
required by law. The stockholders present at a duly called meeting at which a
quorum is present may continue to transact business until adjournment,
notwithstanding the withdrawal of enough stockholders to leave less than a
quorum.

         Section 2.6. Proxies. At all meetings of stockholders, a stockholder
may vote by proxy executed in writing (or in any other manner permitted by law)
by the stockholder, or by his duly authorized attorney-in-fact.


                                       -2-

<PAGE>



         Section 2.7.  Notice of Stockholder Business and Nominations.

         (A) Annual Meetings of Stockholders. (1) Nominations of persons for
election to the Board of Directors of the Corporation and the proposal of
business to be considered by the stockholders may be made at an annual meeting
of stockholders (a) pursuant to the Corporation's notice of meeting, (b) by or
at the direction of the Board of Directors or (c) by any stockholder of the
Corporation who was a stockholder of record at the time of giving of the notice
provided for in this Section 2.7, who is entitled to vote at the meeting and who
complies with the notice procedures set forth in this Section 2.7.

         (2) For nominations or other business to be properly brought before an
annual meeting by a stockholder pursuant to clause (c) of paragraph (A)(1) of
this Section 2.7, the stockholder must have given timely notice thereof in
writing to the Secretary of the Corporation, and such other business must
otherwise be a proper matter for stockholder action. To be timely, a
stockholder's notice shall be delivered to the Secretary at the principal
executive offices of the Corporation not later than the close of business on the
60th day nor earlier than the close of business on the 90th day prior to the
first anniversary of the preceding year's annual meeting; provided, however,
that in the event that the date of the annual meeting is more than 30 days
before or more than 60 days after such anniversary date, notice by the
stockholder to be timely must be so delivered not earlier than the close of
business on the 90th day prior to such annual meeting and not later than the
close of business on the later of the 60th day prior to such annual meeting or
the 10th day following the day on which public announcement of the date of such
meeting is first made by the Corporation. In no event shall the public
announcement of an adjournment of an annual meeting commence a new time period
for the giving of a stockholder's notice as described above. Such stockholder's
notice shall set forth (a) as to each person whom the stockholder proposes to
nominate for election or re-election as a director all information relating to
such person that is required to be disclosed in solicitations of proxies for
election of directors in an election contest, or is otherwise required, in each
case pursuant to Regulation 14A under the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), and Rule 14a-11 thereunder (including such
person's written consent to being named in the proxy statement as a nominee and
to serving as a director if elected); (b) as to any other business that the
stockholder proposes to bring before the meeting, a brief description of the
business desired to be brought before the meeting, the reasons for conducting
such business at the meeting and any material interest in such business of such
stockholder and the beneficial owner, if any, on whose behalf the proposal is
made; and (c) as to the stockholder giving the notice and the beneficial owner,
if any, on whose behalf the nomination or proposal is made (i) the name and
address of such stockholder, as they appear on the Corporation's books, and of
such beneficial owner and (ii) the class and number of shares of the Corporation
which are owned beneficially and of record by such stockholder and such
beneficial owner.

         (3) Notwithstanding anything in the second sentence of paragraph (A)(2)
of this Section 2.7 to the contrary, in the event that the number of directors
to be elected to the Board of Directors of the Corporation is increased and
there is no public announcement

                                       -3-

<PAGE>



by the Corporation naming all of the nominees for election as director or
specifying the size of the increased Board of Directors at least 70 days prior
to the first anniversary of the preceding year's annual meeting, a stockholder's
notice required by this Section 2.7 shall also be considered timely, but only
with respect to nominees for any new positions created by such increase, if it
shall be delivered to the Secretary at the principal executive offices of the
Corporation not later than the close of business on the 10th day following the
day on which such public announcement is first made by the Corporation.

         (B) Special Meetings of Stockholders. Only such business shall be
conducted at a special meeting of stockholders as shall have been brought before
the meeting pursuant to the Corporation's notice of meeting. Nominations of
persons for election to the Board of Directors may be made at a special meeting
of stockholders at which directors are to be elected pursuant to the
Corporation's notice of meeting (a) by or at the direction of the Board of
Directors or (b) provided that the Board of Directors has determined that
directors shall be elected at such meeting, by any stockholder of the
Corporation who is a stockholder of record at the time of giving of notice
provided for in this Section 2.7, who shall be entitled to vote at the meeting
and who complies with the notice procedures set forth in this Section 2.7. In
the event the Corporation calls a special meeting of stockholders for the
purpose of electing one or more directors to the Board of Directors, any such
stockholder may nominate a person or persons (as the case may be), for election
to such position(s) as specified in the Corporation's notice of meeting, if the
stockholder's notice required by paragraph (A)(2) of this Section 2.7 shall be
delivered to the Secretary at the principal executive offices of the Corporation
not earlier than the close of business on the 90th day prior to such special
meeting and not later than the close of business on the later of the 60th day
prior to such special meeting or the 10th day following the day on which public
announcement is first made of the date of the special meeting and of the
nominees proposed by the Board of Directors to be elected at such meeting. In no
event shall the public announcement of an adjournment of a special meeting
commence a new time period for the giving of a stockholder's notice as described
above.

         (C) General. (1) Only such persons who are nominated in accordance with
the procedures set forth in this Section 2.7 shall be eligible to serve as
directors and only such business shall be conducted at a meeting of stockholders
as shall have been brought before the meeting in accordance with the procedures
set forth in this Section 2.7. Except as otherwise provided by law, the
Certificate of Incorporation or these By-laws, the chairman of the meeting shall
have the power and duty to determine whether a nomination or any business
proposed to be brought before the meeting was made or proposed, as the case may
be, in accordance with the procedures set forth in this Section 2.7 and, if any
proposed nomination or business is not in compliance with this Section 2.7, to
declare that such defective proposal or nomination shall be disregarded.

         (2) For purposes of this Section 2.7, "public announcement" shall mean
disclosure in a press release reported by the Dow Jones News Service, Associated
Press or a comparable national news service or in a document publicly filed by
the Corporation with

                                       -4-

<PAGE>



the Securities and Exchange Commission pursuant to Section 13, 14 or 15(d) of
the Exchange Act.

         (3) Notwithstanding the foregoing provisions of this Section 2.7, a
stockholder shall also comply with all applicable requirements of the Exchange
Act and the rules and regulations thereunder with respect to the matters set
forth in this by-law. Nothing in this Section 2.7 shall be deemed to affect any
rights (i) of stockholders to request inclusion of proposals in the
Corporation's proxy statement pursuant to Rule 14a-8 under the Exchange Act or
(ii) of the holders of any series of Preferred Stock to elect directors under
specified circumstances.

         Section 2.8. Procedure for Election of Directors; Required Vote.
Election of directors at all meetings of the stockholders at which directors are
to be elected shall be by ballot, and, subject to the rights of the holders of
any series of Preferred Stock to elect directors under specified circumstances,
a plurality of the votes cast thereat shall elect directors. Except as otherwise
provided by law, the Certificate of Incorporation, or these By-laws, in all
matters other than the election of directors, the affirmative vote of a majority
of the shares present in person or represented by proxy at the meeting and
entitled to vote on the matter shall be the act of the stockholders.

         Section 2.9. Inspectors of Elections; Opening and Closing the Polls.
The Board of Directors by resolution shall appoint one or more inspectors, which
inspector or inspectors may include individuals who serve the Corporation in
other capacities, including, without limitation, as officers, employees, agents
or representatives, to act at meetings of stockholders and make written reports
thereof. One or more persons may be designated as alternate inspectors to
replace any inspector who fails to act. If no inspector or alternate has been
appointed to act or is able to act at a meeting of stockholders, the chairman of
the meeting shall appoint one or more inspectors to act at the meeting. Each
inspector, before discharging his or her duties, shall take and sign an oath
faithfully to execute the duties of inspector with strict impartiality and
according to the best of his or her ability. The inspectors shall have the
duties prescribed by law.

         The chairman of the meeting shall fix and announce at the meeting the
date and time of the opening and the closing of the polls for each matter upon
which the stockholders will vote at a meeting.


                                   ARTICLE III
                               BOARD OF DIRECTORS

         Section 3.1. General Powers. The business and affairs of the
Corporation shall be managed under the direction of the Board of Directors. In
addition to the powers and authorities by these By-laws expressly conferred upon
them, the Board of Directors may exercise all such powers of the Corporation and
do all such lawful acts and things as are

                                       -5-

<PAGE>



not by statute or by the Certificate of Incorporation or by these By-laws 
required to be exercised or done by the stockholders.

         Section 3.2. Number, Tenure and Qualifications. Subject to the rights
of the holders of any series of Preferred Stock to elect directors under
specified circumstances, the number of directors shall be fixed from time to
time exclusively pursuant to a resolution adopted by a majority of the Whole
Board. The directors, other than those who may be elected by the holders of any
series of Preferred Stock under specified circumstances, shall be divided, with
respect to the time for which they severally hold office, into three classes, as
nearly equal in number as is reasonably possible, designated Class I, Class II
and Class III, with the initial term of office of the Class I directors to
expire at the 1999 annual meeting of stockholders, the initial term of office of
the Class II directors to expire at the 2000 annual meeting of stockholders and
the initial term of office of the Class III directors to expire at the 2001
annual meeting of stockholders, with each director to hold office until his or
her successor shall have been duly elected and qualified. No person shall be
nominated for election as a director if such person will attain the age of 69
prior to such person's election as a director. At each annual meeting of
stockholders, commencing with the 1999 annual meeting, directors elected to
succeed those directors whose terms then expire shall be elected for a term of
office to expire at the third succeeding annual meeting of stockholders after
their election, with each director to hold office until his or her successor
shall have been duly elected and qualified.

         Section 3.3. Regular Meetings. A regular meeting of the Board of
Directors shall be held without other notice than this Section 3.3 immediately
after, and at the same place as, the Annual Meeting of Stockholders. The Board
of Directors may fix the time and place for the holding of additional regular
meetings without notice.

         Section 3.4. Special Meetings. Special meetings of the Board of
Directors shall be called at the request of the Chairman, the President or a
majority of the directors then in office. The person or persons authorized to
call special meetings of the Board of Directors may fix the place and time of
such meetings.

         Section 3.5. Notice. Notice of any special meeting or notice of a
change in the time or place of any regular meeting of the Board of Directors
shall be given to each director at his or her business or residence in writing
by hand delivery, first-class or overnight mail or courier service, telegram or
facsimile transmission, or orally by telephone. If mailed by first-class mail,
such notice shall be deemed adequately delivered when deposited in the U.S.
mails so addressed, with postage thereon prepaid, at least five (5) days before
such meeting. If by telegram, overnight mail or courier service, such notice
shall be deemed adequately delivered when the telegram is delivered to the
telegraph company or the notice is delivered to the overnight mail or courier
service company at least twenty-four (24) hours before such meeting. If by
facsimile transmission, such notice shall be deemed adequately delivered when
the notice is transmitted at least twelve (12) hours before such meeting. If by
telephone, the notice shall be communicated to the director or his or her
representative or answering machine. If by telephone or by hand delivery, the
notice shall

                                       -6-

<PAGE>



be given at least twenty-four (24) hours prior to the time set for the meeting.
Neither the business to be transacted at, nor the purpose of, any regular or
special meeting of the Board of Directors need be specified in the notice of
such meeting, except for amendments to these By-laws, as provided under Section
8.1. A meeting may be held at any time without notice if all the directors are
present or if those not present waive notice of the meeting in accordance with
Section 6.4 of these By-laws.

         Section 3.6. Action by Consent of Board of Directors. Any action
required or permitted to be taken at any meeting of the Board of Directors or of
any committee thereof may be taken without a meeting if all members of the Board
of Directors or committee, as the case may be, consent thereto in writing, and
the writing or writings are filed with the minutes of proceedings of the Board
of Directors or committee.

         Section 3.7. Conference Telephone Meetings. 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 conference telephone or similar
communications equipment by means of which all persons participating in the
meeting can hear each other, and such participation in a meeting shall
constitute presence in person at such meeting.

         Section 3.8. Quorum. Subject to Section 3.9, a number of directors
equal to at least a majority of the Whole Board shall constitute a quorum for
the transaction of business. If at any meeting of the Board of Directors there
shall be less than a quorum present, a majority of the directors present may
adjourn the meeting from time to time without further notice. The act of the
majority of the directors present at a meeting at which a quorum is present
shall be the act of the Board of Directors. The directors present at a duly
organized meeting may continue to transact business until adjournment,
notwithstanding the withdrawal of enough directors to leave less than a quorum.

         Section 3.9. Vacancies. Subject to applicable law and the rights of the
holders of any series of Preferred Stock with respect to such series of
Preferred Stock, and unless the Board of Directors otherwise determines,
vacancies resulting from death, resignation, retirement, disqualification,
removal from office or other cause, and newly created directorships resulting
from any increase in the authorized number of directors, may be filled only by
the affirmative vote of a majority of the remaining directors, though less than
a quorum of the Board of Directors, and directors so chosen shall hold office
for a term expiring at the annual meeting of stockholders at which the term of
office of the class to which they have been elected expires and until such
director's successor shall have been duly elected and qualified. No decrease in
the number of authorized directors constituting the Whole Board shall shorten
the term of any incumbent director.

         Section 3.10. Committees. The Board of Directors may establish one or
more committees. Each Committee shall consist of two or more directors of the
Corporation designated by the Board of Directors. The Board of Directors may
designate one or more directors as alternate members of any committee, who may
replace any absent or disqualified member at any meeting of the committee. Any
such committee may to the

                                       -7-

<PAGE>



extent permitted by law exercise such powers and shall have such
responsibilities as shall be specified in the designating resolution. In the
absence or disqualification of any member of such committee or committees, the
member or members thereof present at any meeting and not disqualified from
voting, whether or not constituting a quorum, may unanimously appoint another
member of the Board of Directors to act at the meeting in the place of any such
absent or disqualified member. Each committee shall keep written minutes of its
proceedings and shall report such proceedings to the Board of Directors when
requested.

         A majority of any committee may determine its action and fix the time
and place of its meetings, unless the Board of Directors shall otherwise
provide. Notice of such meetings shall be given to each member of the committee
in the manner provided for in Section 3.5 of these By-laws. The Board of
Directors shall have the power at any time to fill vacancies in, to change the
membership of, or to dissolve any such committee. Nothing herein shall be deemed
to prevent the Board of Directors from appointing one or more committees
consisting in whole or in part of persons who are not directors of the
Corporation; provided, however, that no such committee shall have or may
exercise any authority of the Board of Directors.

         The term of office of a committee member shall be as provided in the
resolution of the Board designating him or her but shall not exceed his or her
term as a director. If prior to the end of his term, a committee member should
cease to be a director, he or she shall cease to be a committee member. Any
member of a committee may resign at any time by giving written notice to the
Board of Directors, the Chairman, the President or the Secretary. Such
resignation shall take effect as provided in Section 6.6 of these By-laws in the
case of resignations by directors. Any member of a committee may be removed from
such committee, either with or without cause, at any time, by resolution adopted
by a majority of the whole Board. Any vacancy in a committee shall be filled by
the Board of Directors in the manner prescribed by these By-laws for the
original designation of the members of such committee.

         Section 3.11. Committee on Officers' Compensation. Pursuant to Section
3.10 of these By-laws, the Board of Directors shall designate a committee to
evaluate the performance of, and to recommend the appropriate level of
compensation for, officers of the Corporation. Such committee shall have access
to an advisor not otherwise serving the Corporation. Each member of such
committee shall be an "independent director," as that term is defined in the
following sentence. For purposes of this Section 3.11, an "independent director"
shall mean a person who (a) has not been employed by the Corporation within the
past five years; (b) is not, and is not affiliated with, a firm that is an
advisor or consultant to the Corporation; (c) is not affiliated with any
customer or supplier of the Corporation whose purchases from and/or sales to the
Corporation exceed 3% of the sales and revenues of such customer or supplier for
its most recently completed fiscal year; (d) has no personal services contract
with the Corporation; (e) is not affiliated with a tax-exempt entity, not
otherwise affiliated with the Corporation, that receives contributions from the
Corporation that exceed 3% of such entity's gross contributions for its most

                                       -8-

<PAGE>



recently completed fiscal year; and (f) is not a member of the "immediate
family" (as defined in Item 404(a) of Securities and Exchange Commission
Regulation S-K) of any person described in clauses (a) through (e).

         Section 3.12. Removal. Subject to the rights of the holders of any
series of Preferred Stock with respect to such series of Preferred Stock, any
director, or the entire Board of Directors, may be removed from office at any
time by the stockholders, but only for cause.

         Section 3.13. Records. The Board of Directors shall cause to be kept a
record containing the minutes of the proceedings of the meetings of the Board of
Directors and of the stockholders, appropriate stock books and registers and
such books of records and accounts as may be necessary for the proper conduct of
the business of the Corporation.


                                   ARTICLE IV
                                    OFFICERS

         Section 4.1. Elected Officers. The elected officers of the Corporation
shall be a Chairman, a President, a Secretary, a Treasurer, and such other
officers (including, without limitation, a Chief Financial Officer) as the Board
of Directors may deem proper from time to time. The Chairman shall be chosen
from among the directors. Each officer elected by the Board of Directors shall
have such powers and duties as generally pertain to his or her respective
office, subject to the specific provisions of this ARTICLE IV. Such officers
shall also have such powers and duties as may be conferred from time to time by
the Board of Directors. The Board of Directors may from time to time elect, or
the Chairman or President may appoint, such assistant officers (including one or
more Assistant Vice Presidents, Assistant Secretaries, Assistant Treasurers and
Assistant Controllers) as may be necessary or desirable for the conduct of the
business of the Corporation. Such assistant officers shall have such duties and
shall hold their offices for such terms as shall be provided in these By-laws or
as may be prescribed by the Board of Directors or by the Chairman or President,
as the case may be.

         Section 4.2. Election and Term of Office. The elected officers of the
Corporation shall be elected annually by the Board of Directors at the regular
meeting of the Board of Directors held after the annual meeting of the
stockholders or at any other time as the Board of Directors may deem proper.
Each officer shall hold office until his successor shall have been duly elected
and shall have qualified or until his death or until he shall resign, but any
officer may be removed from office at any time by the affirmative vote of a
majority of the Whole Board or, except in the case of an officer elected by the
Board of Directors, by the Chairman or President. Such removal shall be without
prejudice to the contractual rights, if any, of the person so removed.


                                       -9-

<PAGE>



         Section 4.3. Chairman. The Chairman shall preside at all meetings of
the stockholders and of the Board of Directors and shall be the Chief Executive
Officer of the Company. The Chairman shall be responsible for the general
management of the affairs of the Corporation and shall perform all duties
incidental to his office which may be required by law and all such other duties
as are properly required of him by the Board of Directors. He shall make reports
to the Board of Directors and the stockholders, and shall see that all orders
and resolutions of the Board of Directors and of any committee thereof are
carried into effect. The Chairman may also serve as President, if so elected by
the Board of Directors.

         Section 4.4. President. The President shall act in a general executive
capacity and shall assist the Chairman in the administration and operation of
the Corporation's business and the general supervision of its policies and
affairs. In the absence of or the inability to act of the Chairman, the
President shall perform all duties of the Chairman and preside at all meetings
of stockholders and of the Board of Directors.

         Section 4.5. Vice Presidents. Each Vice President shall have such
powers and shall perform such duties as shall be assigned to him by the Board of
Directors.

         Section 4.6. Chief Financial Officer. The Chief Financial Officer (if
any) shall be a Vice President and act in an executive financial capacity. He
shall assist the Chairman and the President in the general supervision of the
Corporation's financial policies and affairs.

         Section 4.7. Treasurer. The Treasurer shall exercise general
supervision over the receipt, custody and disbursement of corporate funds. The
Treasurer shall cause the funds of the Corporation to be deposited in such banks
as may be authorized by the Board of Directors, or in such banks as may be
designated as depositaries in the manner provided by resolution of the Board of
Directors. He shall have such further powers and duties and shall be subject to
such directions as may be granted or imposed upon him from time to time by the
Board of Directors, the Chairman or the President.

         Section 4.8. Secretary. The Secretary shall keep or cause to be kept in
one or more books provided for that purpose, the minutes of all meetings of the
Board of Directors, the committees of the Board of Directors and the
stockholders; he shall see that all notices are duly given in accordance with
the provisions of these By-laws and as required by law; he shall be custodian of
the records and the seal of the Corporation and affix and attest the seal to all
stock certificates of the Corporation (unless the seal of the Corporation on
such certificates shall be a facsimile, as hereinafter provided) and affix and
attest the seal to all other documents to be executed on behalf of the
Corporation under its seal; and he shall see that the books, reports,
statements, certificates and other documents and records required by law to be
kept and filed are properly kept and filed; and in general, he shall perform all
the duties incident to the office of Secretary and such other duties as from
time to time may be assigned to him by the Board of Directors, the Chairman or
the President.


                                      -10-

<PAGE>



         Section 4.9. Controller. The Controller shall have general control,
charge and supervision of the accounts of the Corporation. He shall see that
proper accounts are maintained and that all accounts are properly credited from
time to time. He shall prepare or cause to be prepared the financial statements
of the Corporation.

         Section 4.10. Removal. Any officer elected by the Board of Directors
may be removed by the affirmative vote of a majority of the Whole Board
whenever, in their judgment, the best interests of the Corporation would be
served thereby. Any assistant officer appointed by the Chairman or the President
may be removed by him whenever, in his judgment, the best interests of the
Corporation would be served thereby. No elected officer shall have any
contractual rights against the Corporation for compensation by virtue of such
election beyond the date of the election of his successor, his death, his
resignation or his removal, whichever event shall first occur, except as
otherwise provided in an employment contract or under an employee deferred
compensation plan.

         Section 4.11. Vacancies. A newly created elected office and a vacancy
in any elected office because of death, resignation, or removal may be filled by
the Board of Directors for the unexpired portion of the term at any meeting of
the Board of Directors.

                                    ARTICLE V
                        STOCK CERTIFICATES AND TRANSFERS

         Section 5.1. Stock Certificates and Transfers. The interest of each
stockholder of the Corporation shall be evidenced by certificates for shares of
stock in such form as the appropriate officers of the Corporation may from time
to time prescribe. The shares of the stock of the Corporation shall be
transferred on the books of the Corporation by the holder thereof in person or
by his attorney, upon surrender for cancellation of certificates for at least
the same number of shares, with an assignment and power of transfer endorsed
thereon or attached thereto, duly executed, with such proof of the authenticity
of the signature as the Corporation or its agents may reasonably require.

         The certificates of stock shall be signed, countersigned and registered
in such manner as the Board of Directors may by resolution prescribe, which
resolution may permit all or any of the signatures on such certificates to be in
facsimile. In case any officer, transfer agent or registrar who has signed or
whose facsimile signature has been placed upon a certificate has ceased to be
such officer, transfer agent or registrar before such certificate is issued, it
may be issued by the Corporation with the same effect as if he were such
officer, transfer agent or registrar at the date of issue.

         Section 5.2. Lost, Stolen or Destroyed Certificates. No certificate for
shares of stock in the Corporation shall be issued in place of any certificate
alleged to have been lost, destroyed or stolen, except on production of such
evidence of such loss, destruction or theft and on delivery to the Corporation
of a bond of indemnity in such amount, upon

                                      -11-

<PAGE>



such terms and secured by such surety, as the Board of Directors or any
financial officer may in its or his discretion require.


                                   ARTICLE VI
                            MISCELLANEOUS PROVISIONS

         Section 6.1. Fiscal Year. The fiscal year of the Corporation shall
begin on the first day of January and end on the thirty-first day of December of
each year.

         Section 6.2. Dividends. The Board of Directors may from time to time
declare, and the Corporation may pay, dividends on its outstanding shares in the
manner and upon the terms and conditions provided by law and the Certificate of
Incorporation.

         Section 6.3. Seal. The corporate seal shall have enscribed thereon the
words "Corporate Seal," the year of incorporation and around the margin thereof
the words "W. R. Grace & Co."

         Section 6.4. Waiver of Notice. Whenever any notice is required to be
given to any stockholder or director of the Corporation under the provisions of
the General Corporation Law of the State of Delaware (the "GCL") or these
By-laws, a waiver thereof in writing, signed by the person or persons entitled
to such notice, whether before or after the time stated therein, shall be deemed
equivalent to the giving of such notice. The attendance of any stockholder at a
meeting in person or by proxy, without protesting at the beginning of the
meeting the lack of notice of such meeting, shall constitute a waiver of notice
of such stockholder. Neither the business to be transacted at, nor the purpose
of, any annual or special meeting of the stockholders or the Board of Directors
or committee thereof need be specified in any waiver of notice of such meeting.

         Section 6.5. Audits. The accounts, books and records of the Corporation
shall be audited upon the conclusion of each fiscal year by an independent
certified public accountant selected by the Board of Directors, and it shall be
the duty of the Board of Directors to cause such audit to be done annually.

         Section 6.6. Resignations. Any director or any officer or assistant
officer, whether elected or appointed, may resign at any time by giving written
notice of such resignation to the Chairman, the President, or the Secretary, and
such resignation shall be deemed to be effective as of the close of business on
the date said notice is received by the Chairman, the President, or the
Secretary, or at such later time as is specified therein. No formal action shall
be required of the Board of Directors or the stockholders to make any such
resignation effective.

         Section 6.7.  Indemnification and Insurance.






                                      -12-

<PAGE>



         (A) Each person who was or is made a party or is threatened to be made
a party to or is involved in any action, suit, or proceeding, whether civil,
criminal, administrative or investigative (hereinafter, a "proceeding"), by
reason of the fact that he or she or a person of whom he or she is the legal
representative is or was a director or officer of the Corporation or is or was
serving at the request of the Corporation as a director, officer, employee or
agent of another corporation or of a partnership, joint venture, trust or other
enterprise, including service with respect to employee benefit plans maintained
or sponsored by the Corporation, whether the basis of such proceeding is alleged
action in an official capacity as a director, officer, employee or agent or in
any other capacity while serving as a director, officer, employee or agent,
shall be indemnified and held harmless by the Corporation to the fullest extent
authorized by the GCL as the same exists or may hereafter be amended (but, in
the case of any such amendment, only to the extent that such amendment permits
the Corporation to provide broader indemnification rights than said law
permitted the Corporation to provide prior to such amendment), against all
expense, liability and loss (including attorneys' fees, judgments, fines, ERISA
excise taxes or penalties and amounts paid or to be paid in settlement)
reasonably incurred or suffered by such person in connection therewith, and such
indemnification shall continue as to a person who has ceased to be a director,
officer, employee or agent and shall inure to the benefit of his or her heirs,
executors and administrators; provided, however, that except as provided in
paragraph (C) of this Section 6.7, the Corporation shall indemnify any such
person seeking indemnification in connection with a proceeding (or part thereof)
initiated by such person only if such proceeding (or part thereof) was
authorized by the Board of Directors. The right to indemnification conferred in
this Section 6.7 shall be a contract right and shall include the right to be
paid by the Corporation the expenses incurred in defending any such proceeding
in advance of its final disposition, such advances to be paid by the Corporation
within 20 days after the receipt by the Corporation of a statement or statements
from the claimant requesting such advance or advances from time to time;
provided, however, that if the GCL requires, the payment of such expenses
incurred by a director or officer in his or her capacity as a director or
officer (and not in any other capacity in which service was or is rendered by
such person while a director or officer, including, without limitation, service
to an employee benefit plan) in advance of the final disposition of a
proceeding, shall be made only upon delivery to the Corporation of an
undertaking by or on behalf of such director or officer, to repay all amounts so
advanced if it shall ultimately be determined that such director or officer is
not entitled to be indemnified under this Section 6.7 or otherwise.

         (B) To obtain indemnification under this Section 6.7, a claimant shall
submit to the Corporation a written request, including therein or therewith such
documentation and information as is reasonably available to the claimant and is
reasonably necessary to determine whether and to what extent the claimant is
entitled to indemnification. Upon written request by a claimant for
indemnification pursuant to the first sentence of this paragraph (B), a
determination, if required by applicable law, with respect to the claimant's
entitlement thereto shall be made as follows: (1) if requested by the claimant,
by Independent Counsel (as hereinafter defined), or (2) if no request is made by
the claimant for a determination by Independent Counsel, (i) by the Board of
Directors by a majority vote

                                      -13-

<PAGE>



of a quorum consisting of Disinterested Directors (as hereinafter defined), or
(ii) if a quorum of the Board of Directors consisting of Disinterested Directors
is not obtainable or, even if obtainable, such quorum of Disinterested Directors
so directs, by Independent Counsel in a written opinion to the Board of
Directors, a copy of which shall be delivered to the claimant, or (iii) if a
quorum of Disinterested Directors so directs, by the stockholders of the
Corporation. In the event the determination of entitlement to indemnification is
to be made by Independent Counsel at the request of the claimant, the
Independent Counsel shall be selected by the Board of Directors unless there
shall have occurred within two years prior to the date of the commencement of
the action, suit or proceeding for which indemnification is claimed a "Change of
Control" (as defined below) in which case the Independent Counsel shall be
selected by the claimant unless the claimant shall request that such selection
be made by the Board of Directors. If it is so determined that the claimant is
entitled to indemnification, payment to the claimant shall be made within 10
days after such determination.

         (C) If a claim under paragraph (A) of this Section 6.7 is not paid in
full by the Corporation within 30 days after a written claim pursuant to
paragraph (B) of this Section 6.7 has been received by the Corporation, the
claimant may at any time thereafter bring suit against the Corporation to
recover the unpaid amount of the claim and, if successful in whole or in part,
the claimant shall be entitled to be paid also the expense of prosecuting such
claim. It shall be a defense to any such action (other than an action brought to
enforce a claim for expenses incurred in defending any proceeding in advance of
its final disposition where the required undertaking, if any is required, has
been tendered to the Corporation) that the claimant has not met the standard of
conduct which makes it permissible under the GCL for the Corporation to
indemnify the claimant for the amount claimed, but the burden of proving such
defense shall be on the Corporation. Neither the failure of the Corporation
(including its Board of Directors, Independent Counsel or stockholders) to have
made a determination prior to the commencement of such action that
indemnification of the claimant is proper in the circumstances because he or she
has met the applicable standard of conduct set forth in the GCL, nor an actual
determination by the Corporation (including its Board of Directors, Independent
Counsel or stockholders) that the claimant has not met such applicable standard
of conduct, shall be a defense to the action or create a presumption that the
claimant has not met the applicable standard of conduct.

         (D) If a determination shall have been made pursuant to paragraph (B)
of this Section 6.7 that the claimant is entitled to indemnification, the
Corporation shall be bound by such determination in any judicial proceeding
commenced pursuant to paragraph (C) of this Section 6.7.

         (E) The Corporation shall be precluded from asserting in any judicial
proceeding commenced pursuant to paragraph (C) of this Section 6.7 that the
procedures and presumptions of this Section 6.7 are not valid, binding and
enforceable and shall stipulate in such proceeding that the Corporation is bound
by all the provisions of this Section 6.7.


                                      -14-

<PAGE>



         (F) The right to indemnification and the payment of expenses incurred
in defending a proceeding in advance of its final disposition conferred in this
Section 6.7 shall not be exclusive of any other right which any person may have
or hereafter acquire under any statute, provision of the Certificate of
Incorporation, these By-laws, agreement, vote of stockholders or Disinterested
Directors or otherwise. No repeal or modification of this Section 6.7 shall in
any way diminish or adversely affect the rights of any director, officer,
employee or agent of the Corporation hereunder in respect of any occurrence or
matter arising prior to any such repeal or modification.

         (G) The Corporation may maintain insurance, at its expense, to protect
itself and any director, officer, employee or agent of the Corporation or
another corporation, partnership, joint venture, trust or other enterprise
against any expense, liability or loss, whether or not the Corporation would
have the power to indemnify such person against such expense, liability or loss
under the GCL. To the extent that the Corporation maintains any policy or
policies providing such insurance, each such director or officer, and each such
agent or employee to which rights to indemnification have been granted as
provided in paragraph (H) of this Section 6.7, shall be covered by such policy
or policies in accordance with its or their terms to the maximum extent of the
coverage thereunder for any such director, officer, employee or agent.

         (H) The Corporation may, to the extent authorized from time to time by
the Board of Directors, grant rights to indemnification, and rights to be paid
by the Corporation the expenses incurred in defending any proceeding in advance
of its final disposition, to any employee or agent of the Corporation to the
fullest extent of the provisions of this Section 6.7 with respect to the
indemnification and advancement of expenses of directors and officers of the
Corporation.

         (I) If any provision or provisions of this Section 6.7 shall be held to
be invalid, illegal or unenforceable for any reason whatsoever: (1) the
validity, legality and enforceability of the remaining provisions of this
Section 6.7 (including, without limitation, each portion of any paragraph of
this By-law containing any such provision held to be invalid, illegal or
unenforceable, that is not itself held to be invalid, illegal or unenforceable)
shall not in any way be affected or impaired thereby; and (2) to the fullest
extent possible, the provisions of this Section 6.7 (including, without
limitation, each such portion of any paragraph of this By-law containing any
such provision held to be invalid, illegal or unenforceable) shall be construed
so as to give effect to the intent manifested by the provision held invalid,
illegal or unenforceable.

         (J) For purposes of this Section 6.7:

                  (1) "Disinterested Director" means a director of the
         Corporation who is not and was not a party to the matter in respect of
         which indemnification is sought by the claimant.


                                      -15-

<PAGE>



                  (2) "Independent Counsel" means a law firm, a member of a law
         firm, or an independent practitioner, that is experienced in matters of
         corporation law and shall include any person who, under the applicable
         standards of professional conduct then prevailing, would not have a
         conflict of interest in representing either the Corporation or the
         claimant in an action to determine the claimant's rights under this
         Section 6.7.

                  (3) "Change of Control" has the meaning given such term in the
         Corporation's 1998 Stock Incentive Plan, as the same may be amended or
         superseded from time to time.

         (K) Any notice, request or other communication required or permitted to
be given to the Corporation under this Section 6.7 shall be in writing and
either delivered in person or sent by telecopy, telex, telegram, overnight mail
or courier service, or certified or registered mail, postage prepaid, return
receipt requested, to the Secretary of the Corporation and shall be effective
only upon receipt by the Secretary.


                                   ARTICLE VII
                            CONTRACTS, PROXIES, ETC.

         Section 7.1. Contracts. Except as otherwise required by law, the
Certificate of Incorporation or these By-laws, any contracts or other
instruments may be executed and delivered in the name and on the behalf of the
Corporation by such officer or officers of the Corporation as the Board of
Directors may from time to time direct. Such authority may be general or
confined to specific instances as the Board of Directors may determine. The
Chairman, the President or any Vice President may execute bonds, contracts,
deeds, leases and other instruments to be made or executed for or on behalf of
the Corporation. Subject to any restrictions imposed by the Board of Directors
or the Chairman, the President or any Vice President of the Corporation may
delegate contractual powers to others under his jurisdiction, it being
understood, however, that any such delegation of power shall not relieve such
officer of responsibility with respect to the exercise of such delegated power.

         Section 7.2. Proxies. Unless otherwise provided by resolution adopted
by the Board of Directors, the Chairman, the President or any Vice President may
from time to time appoint an attorney or attorneys or agent or agents of the
Corporation, in the name and on behalf of the Corporation, to cast the votes
which the Corporation may be entitled to cast as the holder of stock or other
securities in any other corporation, any of whose stock or other securities may
be held by the Corporation, at meetings of the holders of the stock or other
securities of such other corporation, or to consent in writing, in the name of
the Corporation as such holder, to any action by such other corporation, and may
instruct the person or persons so appointed as to the manner of casting such
votes or giving such consent, and may execute or cause to be executed in the
name and on behalf of the

                                      -16-

<PAGE>


Corporation and under its corporate seal or otherwise, all such written proxies
or other instruments as he may deem necessary or proper in the premises.


                                  ARTICLE VIII
                                   AMENDMENTS

         Section 8.1. Amendments. These By-laws may be altered, amended, or
repealed at any meeting of the Board of Directors or of the stockholders,
provided notice of the proposed change was given in the notice of the meeting
and, in the case of a meeting of the Board of Directors, in a notice given not
less than two days prior to the meeting; provided, however, that, in the case of
amendments by stockholders, notwithstanding any other provisions of these
By-laws or any provision of law which might otherwise permit a lesser vote or no
vote, but in addition to any affirmative vote of the holders of any particular
class or series of the capital stock of the Corporation required by law, the
Certificate of Incorporation or these By-laws, the affirmative vote of the
holders of at least 80 percent of the voting power of all the then outstanding
shares of the Voting Stock, voting together as a single class, shall be required
to alter, amend or repeal any provision of these By-laws.








                                      -17-