THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER 
THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND MAY 
NOT BE TRANSFERRED, SOLD OR OTHERWISE DISPOSED OF EXCEPT WHILE SUCH A 
REGISTRATION IS IN EFFECT UNDER SUCH ACT AND APPLICABLE STATE SECURITIES LAWS 
OR PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT OR SUCH LAWS.  
THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE ALSO SUBJECT TO CERTAIN 
RESTRICTIONS ON TRANSFERS SET FORTH IN A SHAREHOLDERS' AGREEMENT, DATED AS OF 
AUGUST , 1997 (AS AMENDED, MODIFIED OR SUPPLEMENTED THROUGH THE DATE HEREOF, 
THE "SHAREHOLDERS' AGREEMENT"), BY AND AMONG BURKE INDUSTRIES, INC., A 
CALIFORNIA CORPORATION ("BURKE") AND THE SHAREHOLDERS NAMED THEREIN, A COPY 
OF WHICH IS AVAILABLE FOR INSPECTION AT THE OFFICES OF JFL MERGER CO., A 
CALIFORNIA CORPORATION (THE "COMPANY") AND BURKE.  NO TRANSFER OF SUCH 
SECURITIES WILL BE MADE ON THE BOOKS OF THE COMPANY UNLESS ACCOMPANIED BY 
EVIDENCE OF COMPLIANCE WITH THE TERMS OF SUCH AGREEMENTS.

        EXERCISABLE AT ANY TIME SUBJECT TO THE PROVISIONS HEREOF

NO. 1                         JFL MERGER CO.
                           WARRANT CERTIFICATE

               Warrant Certificate for _______ Warrants 
                   to Purchase _______ Warrant Shares

         This Warrant Certificate certifies that, for value received, 
[Massachusetts Mutual Life Insurance Company, MassMutual Corporate Value
Partners, L.P. and MassMutual High Yield Partners, L.L.C.]
[Jackson National Life Insurance Company] [Paribas Principal Partners] (the 
"Holder") is the owner of the number of Warrants (as defined in Section 
1.2(a) below) set forth above, each of which entitles the Holder to purchase 
from JFL Merger Co., a California corporation (the "Company") at any time 
from and after the date hereof and until the Expiration Date (as defined in 
Section 2.1 hereof) one Warrant Share (as defined below), at the purchase 
price stated in Section 2.3 hereof (the "Exercise Price").  The number of 
Warrant Shares purchasable upon exercise of the Warrants and the Exercise 
Price shall be subject to adjustment from time to time as herein provided.

         For purposes of this Warrant Certificate, "Warrant Shares" shall 
mean shares of the Company's Common Stock, no par value (the "Common Stock"); 
PROVIDED, HOWEVER, that if, in accordance with Section 6.3 hereof, the 
securities issuable upon exercise of the Warrants are issued by an entity 
other than the Company or there is a change in the class of securities so 
issuable, then the "Warrant Shares" shall mean the securities so issuable by 
such entity or the securities of the class of securities so issuable.



         The Warrants are subject to the following terms, conditions and 
provisions:

         SECTION 1.  REGISTRATION; TRANSFERABILITY; EXCHANGE OF WARRANT
CERTIFICATE.

         1.1  REGISTRATION.  The Company shall number and register the 
Warrants in a register (the "Warrant Register") maintained at the principal 
office of the Company (the "Office").  The Company shall be entitled to treat 
the Holder of the Warrants as the owner thereof for all purposes and shall 
not be bound to recognize any equitable or other claim to or interest in such 
Warrants on the part of any other person.

         1.2   TRANSFER AND EXCHANGE.

         (a)  Subject to compliance with any restrictions on transfer set 
forth in the Shareholders' Agreement, dated as of August __, 1997, by and 
among Burke Industries, Inc. ("Burke"), Holder, [Massachusetts Mutual Life
Insurance Company] [Jackson National Life Insurance Company] [Paribas Principal
Partners] and the other shareholders named therein (the "Shareholders'
Agreement") (Holder and [Massachusetts Mutual Life Insurance Company] 
[Jackson National Life Insurance Company] [Paribas Principal Partners] shall 
sometimes be collectively referred to herein as the "Initial 
Warrantholders"), the warrants issued to the Initial Warrantholders (the 
"Warrants") shall be transferable only on the Warrant Register upon delivery 
thereof by the Holder or by his duly authorized attorney or representative or 
accompanied by proper evidence of succession, assignment or authority to 
transfer.  Upon any such registration of transfer, a new Warrant Certificate, 
in substantially the form of this Warrant Certificate, evidencing the 
Warrants so transferred shall be issued to the transferee of such Warrants 
and a new Warrant Certificate, in substantially the form of this Warrant 
Certificate, evidencing the remaining Warrants, if any, not so transferred, 
shall be issued to the Holder.  In all cases of transfer by an attorney, the 
original power of attorney, duly approved, or a copy thereof, duly certified, 
shall be deposited and shall remain with the Company.  In case of transfers 
by executors, administrators, guardians or other legal representatives, duly 
authenticated evidence of their authority shall be produced, and may be 
required to be deposited and to remain with the Company in its discretion. No 
transfer of the Warrants or any interest therein other than in compliance 
with this Section 1.2 shall be made or recorded in the Warrant Register, and 
any such purported transfer shall be void and of no effect.

         (b)  This Warrant Certificate is exchangeable, in whole or in part, 
upon the surrender hereof by the holder hereof at the Office for new Warrant 
Certificates, in substantially the form of this Warrant Certificate, 
evidencing in the aggregate the right to purchase the number of Warrant 
Shares that may then be purchased hereunder, each of such new Warrant 
Certificates to be dated the date of such exchange and to represent the right 
to purchase such number of Warrant Shares as shall be designated by the 
holder of such new Warrant Certificates at the time of such surrender.

                                       2


         SECTION 2.  TERM OF WARRANTS; EXERCISE OF WARRANTS.

         2.1  TERM OF WARRANT.  Subject to the terms of this Warrant 
Certificate, the Holder shall have the right, which may be exercised by the 
registered Holder hereof from time to time on any Business Day before 5:00 
P.M. (New York City time) during the period through and including February    
, 2008 (the "Expiration Date") to purchase from the Company an aggregate of 
_______ fully paid and nonassessable Warrant Shares or such other number of 
Warrant Shares which the Holder may at the time be entitled to purchase in 
accordance with this Warrant Certificate.  At 5:00 P.M. (New York City time) 
on the Expiration Date, each Warrant not exercised prior thereto shall be and 
become void and of no value.

         2.2  EXERCISE OF WARRANTS.  Subject to the terms of this Warrant 
Certificate, the Warrants evidenced by this Warrant Certificate may be 
exercised in whole or in part, upon surrender to the Company, at its Office, 
of this Warrant Certificate, with a Purchase Form substantially in the form 
attached hereto duly completed and signed, and upon payment to the Company of 
the Exercise Price. Payment of the aggregate Exercise Price shall be in cash; 
PROVIDED, HOWEVER, that in lieu of payment in cash, the Holder may, at its 
option, pay all or a portion of the aggregate Exercise Price by tendering 
shares it holds of the Series A 11.5% Cumulative Redeemable Preferred Stock 
of the Company, which shares shall be valued at their stated liquidation 
value, plus any accrued but unpaid dividends thereon, to the date of exercise 
pursuant to this Section 2.2.  Payment of the aggregate Exercise Price in 
cash shall be by wire transfer in immediately available funds to an account 
designated in writing by the Company to the Holder.

         Upon the surrender of this Warrant Certificate, with the Purchase 
Form duly executed, and payment of the Exercise Price as aforesaid, the 
Company shall (subject to compliance, if necessary, with applicable 
provisions of the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as 
amended), promptly and, in any event within ten Business Days, issue and 
deliver to or upon the written order of the Holder and in such name or names 
as the Holder may designate a certificate or certificates for such number of 
Warrant Shares so purchased.  Such certificate or certificates shall be dated 
and deemed to have been issued as of the date of the surrender of this 
Warrant Certificate and payment of the Exercise Price, as aforesaid.  The 
right of purchase represented by this Warrant Certificate shall be 
exercisable, at the election of the Holder, in full at any time or in part 
from time to time.  In the event the Holder shall exercise fewer than all the 
Warrants evidenced hereby, a new Warrant Certificate shall be issued 
evidencing the remaining unexercised Warrants.

         2.3  EXERCISE PRICE.  The price per share at which each Warrant 
Share shall be purchased upon exercise of each Warrant (the "Exercise Price") 
shall be $____, subject to adjustment pursuant to Section 6 LESS an amount 
per Warrant equal to the dividends in respect of the Warrant Shares that the 
holder would have received had such Warrant been exercised on August 20, 
1997.  The aggregate Exercise Price for all Warrant Shares subject to this 
Warrant Certificate shall be rounded to the next higher $0.01.


                                       3


         SECTION 3.  PAYMENT OF TAXES.  The Company covenants and agrees that 
it will pay when due and payable all documentary, stamp and other similar 
taxes, if any, which may be payable in respect of the issuance or delivery of 
the Warrants or of the Warrant Shares purchasable and issuable upon the 
exercise of the Warrants; PROVIDED, HOWEVER, that the Company shall not be 
required to pay any such tax or other charge imposed in respect of the 
transfer of Warrants, or the issuance or delivery of certificates for Warrant 
Shares or other Securities in respect of the Warrant Shares upon the exercise 
of Warrants, to a person or entity other than a then-existing registered 
Holder of Warrants.

         SECTION 4.  MUTILATED OR MISSING WARRANTS.  In the event this 
Warrant Certificate shall be mutilated, lost, stolen or destroyed, the 
Company shall issue and deliver in exchange and substitution for and upon 
cancellation of the mutilated Warrant Certificate, or in lieu of and in 
substitution for the Warrant Certificate lost, stolen or destroyed, a new 
Warrant Certificate of like tenor and representing an equivalent right or 
interest, but only upon, in the event of a lost, stolen or destroyed 
certificate, receipt of evidence satisfactory to the Company of such loss, 
theft or destruction and, if requested by the Company, upon indemnity that 
also is satisfactory to it; PROVIDED that a written undertaking of such loss, 
theft or destruction of this Warrant Certificate by the registered Holder 
hereof shall be deemed a satisfactory indemnity of the Company for purposes 
of this Section 4. In making application for such a substitute Warrant 
Certificate, the Holder shall also comply with such other reasonable 
requirements as the Company may prescribe.

         SECTION 5.  RESERVATION AND AVAILABILITY OF WARRANT SHARES; PURCHASE
AND CANCELLATION OF WARRANTS.

         5.1  RESERVATION OF WARRANT SHARES.  

         (a)  The Company shall at all times reserve and keep available free 
from preemptive rights, out of the aggregate of its authorized but unissued 
shares of Common Stock, for the purpose of enabling it to satisfy any 
obligations to issue the Warrant Shares upon exercise of the Warrants, the 
full number of Warrant Shares deliverable upon the exercise of all the 
Warrants evidenced by this Warrant Certificate.  The Company or, if 
appointed, the transfer agent for the Common Stock and every subsequent 
transfer agent for any shares of the Company's capital stock issuable upon 
the exercise of any of the rights of purchase aforesaid (each, a "Transfer 
Agent") shall be irrevocably authorized and directed at all times to reserve 
such number of authorized shares of Common Stock as shall be required for 
such purpose.  The Company will keep a copy of this Warrant Certificate on 
file with each Transfer Agent.  The Company will furnish such Transfer Agent 
a copy of all notices of adjustments and certificates related thereto which 
are transmitted to the Holder pursuant to Section 6 hereof.

         (b)  The Company covenants that all Warrant Shares issuable upon 
exercise of the Warrants will, upon issuance, be fully paid, nonassessable 
and free from preemptive


                                       4


rights and free from all taxes, liens, charges and security interests with 
respect to the issuance thereof.

         (c)  Before taking any action which would cause an adjustment 
pursuant to Section 6, the Company will take any and all corporate action 
which may, in the opinion of its counsel, be necessary in order that the 
Company may validly and legally issue fully paid and nonassessable Warrant 
Shares at the Exercise Price as so adjusted.

         5.2  WARRANT SHARES RECORD DATE.  Each person in whose name any 
stock certificate for Warrant Shares is issued shall for all purposes be 
deemed to have become the holder of record of the Warrant Shares represented 
thereby, and such stock certificate shall be dated the date upon which this 
Warrant Certificate was duly surrendered and payment of the Exercise Price 
(and any applicable transfer taxes) was made.

         5.3  CANCELLATION OF WARRANT.  Upon surrender of the Warrant 
Certificate for exchange, substitution, transfer or exercise, it shall be 
cancelled by the Company and retired.

         SECTION 6.  ADJUSTMENT OF NUMBER OF WARRANT SHARES AND EXERCISE 
PRICE. The number of securities purchasable upon the exercise of each Warrant 
and the Exercise Price shall be subject to adjustment from time to time upon 
the happening of certain events as hereinafter described.

         6.1  MANDATORY ADJUSTMENTS.  The number of securities purchasable 
upon the exercise of the Warrants and the Exercise Price shall be subject to 
adjustment as follows:

              (a)  In case the Company shall (i) declare or pay a dividend on 
    any of its outstanding Common Stock in shares of Common Stock or make a 
    distribution to holders of its outstanding Common Stock in shares of 
    Common Stock, (ii) subdivide any of its outstanding Common Stock into a 
    greater number of shares of Common Stock, (iii) combine any of its 
    outstanding Common Stock into a smaller number of shares of Common Stock 
    or (iv) issue by reclassification of any of its shares of Common Stock 
    other securities of the Company (including any such reclassification in 
    connection with a consolidation, merger or other business combination in 
    which the Company is the surviving corporation), the number and kind of 
    Warrant Shares purchasable and issuable upon exercise of the Warrants 
    shall be adjusted so that the Holder, upon exercise thereof, shall be 
    entitled to receive the number and kind of Warrant Shares and other 
    securities of the Company that the Holder would have owned or have been 
    entitled to receive after the happening of any of the events described 
    above had the Warrants been exercised and the relevant Warrant Shares 
    issued in the name of the Holder immediately prior to the happening of 
    such event or, if applicable, any record date with respect thereto.  An 
    adjustment made pursuant to this paragraph (a) shall become effective on 
    the date of the dividend payment, subdivision, combination or issuance 
    retroactive to the record date with respect thereto, if any, for such 
    event.  Upon adjustment of the number of Warrant

                                      5


    Shares as provided in this paragraph (a), the Exercise Price payable upon 
    exercise of each Warrant shall be adjusted by multiplying such Exercise 
    Price immediately prior to such adjustment by a fraction of which the 
    numerator shall be the number of Warrant Shares purchasable upon the 
    exercise of each Warrant immediately prior to such adjustment and of 
    which the denominator shall be the number of Warrant Shares purchasable 
    immediately thereafter.

              (b)  In case the Company shall distribute to all holders of its 
    outstanding Common Stock evidences of indebtedness of the Company, cash 
    (including cash dividends payable out of consolidated earnings or earned 
    surplus) or assets or securities other than its Common Stock (including 
    stock of a subsidiary or securities convertible into or exercisable for 
    such stock but excluding dividends or distributions referred to in 
    Sections 6.1(a) above or Section 6.1(c) below) (any such evidences of 
    indebtedness, cash, assets or securities, the "assets or securities"), 
    then, in each case, the Exercise Price shall be adjusted by subtracting 
    from the Exercise Price then in effect the value per share (as determined 
    in accordance with Section 6.2(b)) of the assets or securities that the 
    Holder would have been entitled to receive as a result of such 
    distribution had the Warrant been exercised and the relevant Warrant 
    Shares issued in the name of the Holder immediately prior to the record 
    date for such distribution; PROVIDED that if, after giving effect to such 
    adjustment, the Exercise Price would be less than $0.01 per share, the 
    Company shall distribute such assets or securities to the Holder as if 
    the Holder had exercised the Warrants and the Warrant Shares had been 
    issued in the name of the Holder immediately prior to the record date for 
    such distribution.  Any adjustment required by this Section 6.1(b) shall 
    be made whenever any such distribution is made, and shall become 
    effective on the date of distribution retroactive to the record date for 
    the determination of shareholders entitled to receive such distribution.

              (c)  If at any time after the date hereof the Company shall 
    issue or sell any shares of Common Stock or any warrants, options or 
    rights to subscribe for or purchase Common Stock or securities 
    convertible into Common Stock (but excluding distributions referred to in 
    paragraph (a) or (b) above or (d) below), and the consideration per share 
    for, or the price per share at which such warrant, option or right is 
    exercisable for or convertible into, such Common Stock is less than the 
    Fair Market Value (as defined below) of the Common Stock immediately 
    prior to such issuance or sale, then, forthwith upon such issuance or 
    sale, the Exercise Price shall be reduced to the price determined by 
    multiplying the Exercise Price in effect immediately prior to the time of 
    such issuance or sale by a fraction the numerator of which shall be the 
    sum of (i) the number of shares of Common Stock outstanding immediately 
    prior to such issuance or sale MULTIPLIED BY the Fair Market Value 
    immediately prior to such issuance or sale and (ii) the consideration 
    received by the Company upon such issuance or sale, and the denominator 
    of which shall be the total number of shares of Common Stock outstanding 
    immediately after such issuance or sale MULTIPLIED BY the Fair Market 
    Value immediately prior to such issuance or sale.

                                      6


              Notwithstanding the foregoing, the Company may, without 
    adjustment to the Exercise Price pursuant to this Section 6.1(c), issue 
    options, warrants or rights to subscribe for shares of its Common Stock 
    to officers, directors, employees, consultants or agents of the Company 
    pursuant to the terms of any stock option plan or arrangement approved by 
    the Board of Directors, and may issue shares of its Common Stock upon the 
    exercise of any such stock options, warrants or rights; PROVIDED, 
    HOWEVER, that the aggregate number of shares of Common Stock that may be 
    issued at any one time under such stock option plan or arrangement 
    without adjustment to the Exercise Price under this Section 6.1(c) shall 
    not exceed 10% of the shares of Common Stock outstanding on the date 
    hereof, calculated on a fully diluted basis.

              As used herein, "Fair Market Value" of the Common Stock or 
    other securities means, on any date, the average of the last sale price, 
    regular way, for the 10-business day period immediately preceding such 
    date, or if no such sales took place during such 10-business day period, 
    the average of the closing bid and asked prices, regular way, for each 
    day in such 10-business day period, in either case as reported on the 
    principal consolidated transaction reporting system with respect to 
    securities listed on the principal national securities exchange on which 
    the shares of Common Stock or such other securities are listed, or, if 
    the Common Stock or such other securities are not listed or admitted to 
    trading on any national securities exchange, the average of the last 
    quoted sale price for such 10-business day period or, if not so quoted, 
    the average of the high bid and low asked prices for each day in such 
    10-business day period in the over-the-counter market, as reported by the 
    National Association of Securities Dealers, Inc. Automated Quotation 
    System or such other system then in use, or, if on any such date the 
    Common Stock is not quoted by any such organization, the average of the 
    closing bid and asked prices during such 10-business day period as 
    furnished by a professional market maker making a market in the Common 
    Stock or such other securities selected by the Board of Directors of the 
    Company.  If the shares of Common Stock or such other securities are not 
    publicly held or so listed or publicly traded, "Fair Market Value" shall 
    mean the fair market value per share of Common Stock or such other 
    securities as determined by the Company and the holders of at least a 
    majority of the Warrants issued to the Warrantholders that are then 
    outstanding. negotiating in good faith toward agreeing upon such value.  
    If no agreement can be reached within 14 days from the date of receipt by 
    Required Purchasers of the notice required by Section 6.2(a), the Company 
    and the Required Purchasers shall appoint within 21 days from the date of 
    such receipt a mutually acceptable independent investment banking firm to 
    determine the Fair Market Value.  Such firm shall make the necessary 
    determination which shall be binding absent actual fraud or manifest 
    error.  The fees of such firm for making such determination and any 
    related reimbursable expenses shall be paid by the Company.

              (d)  If at any time after the date hereof the Company shall 
    issue or sell to any person any securities convertible into or 
    exercisable for Common Stock

                                      7


    ("Convertible Securities") (other than securities distributed in a 
    transaction described in paragraph (b) or (c) above), whether or not the 
    rights to exchange or convert thereunder are immediately exercisable, and 
    the price per share for which Common Stock is issuable upon such 
    conversion or exchange shall be less than the Fair Market Value in effect 
    immediately prior to the time of such issue or sale, then the Exercise 
    Price shall be adjusted as provided in subparagraph (c) above on the 
    basis that (i) the maximum number of shares of Common Stock necessary to 
    effect the conversion or exchange of all such Convertible Securities 
    shall be deemed to have been issued and outstanding, (ii) the price per 
    share of such shares shall be deemed to be the lowest possible price in 
    any range of prices at which such additional shares are available to such 
    holders, and (iii) the Company shall be deemed to have received all of 
    the consideration payable therefor, if any, as of the date of actual 
    issuance of such Convertible Securities.  No adjustment of the Exercise 
    Price shall be made under this subparagraph (d) upon the issuance of any 
    Convertible Securities which are issued pursuant to the exercise of any 
    warrants or other subscription or purchase rights therefor, if any such 
    adjustment shall previously have been made upon the issuance of such 
    warrants or other rights pursuant to subparagraph (c) above. No further 
    adjustments of the Exercise Price shall be made upon the actual issuance 
    of such Common Stock upon conversion or exchange of such Convertible 
    Securities and, if any issue or sale of such Convertible Securities is 
    made upon exercise of any warrant or other right to subscribe for or to 
    purchase any such Convertible Securities for which adjustments of the 
    Exercise Price have been or are to be made pursuant to other provisions 
    of this Section 6.1, no further adjustments of the Exercise Price shall 
    be made by reason of such issue or sale.  For the purposes of this 
    subparagraph (d), the date as of which the Exercise Price shall be 
    computed shall be the earlier of (i) the date on which the Company shall 
    enter into a firm contract for the issuance of such Convertible 
    Securities and (ii) the date of actual issuance of such Convertible 
    Securities.  Such adjustments shall be made upon each issuance of 
    Convertible Securities and shall become effective immediately after such 
    issuance.

              (e)  No adjustment in the number of Warrant Shares purchasable 
    hereunder shall be required unless such adjustment would require an 
    increase or decrease of at least one quarter of one percent (0.25%) in 
    the number of Warrant Shares purchasable upon the exercise of each 
    Warrant; PROVIDED, HOWEVER, that any adjustments which by reason of this 
    Section 6.1(e) are not required to be made shall be made immediately 
    prior to any exercise of any Warrants or, if no such exercise occurs 
    prior to the time that any subsequent adjustment would be made, carried 
    forward and taken into account in such subsequent adjustment.  All 
    calculations shall be made to the nearest one-thousandth of a share.  No 
    adjustment need be made for a change in the par value of the Warrant 
    Shares.

              (f)  Upon each adjustment of the Exercise Price pursuant to
    paragraphs (b) through (d) of this Section 6.1, this Warrant Certificate
    shall be deemed to evidence the right to purchase, at the adjusted Exercise
    Price, that number


                                      8


    of Warrant Shares obtained by multiplying the number of Warrant Shares 
    covered by this Warrant Certificate immediately prior to such adjustment 
    by the Exercise Price in effect prior to such adjustment and dividing the 
    product so obtained by the Exercise Price in effect after such adjustment.

              (g)  The number of shares of Common Stock outstanding at any given
    time shall not include shares directly or indirectly owned or held by or for
    the account of the Company or any of its subsidiaries, and the disposition
    of any such shares shall be considered an issue or sale of Common Stock for
    the purposes of this Section 6.1.

         6.2  NOTICE OF ADJUSTMENT.

         (a)  The Company hereby agrees that whenever any adjustment of the 
number of Warrant Shares purchasable upon the exercise of the Warrants or the 
Exercise Price of such Warrants is effected as herein provided, the Company 
shall promptly notify the Holder, by first class mail, postage prepaid, of 
such adjustment and shall deliver to the Holder a certificate of the Chief 
Financial Officer of the Company, setting forth in reasonable detail (i) the 
number of Warrant Shares purchasable upon the exercise of the Warrants and 
the Exercise Price of the Warrants after such adjustment, (ii) a brief 
statement of the facts requiring such adjustment and (iii) the computation by 
which such adjustment was made.

         (b)  If any adjustment is required to be made pursuant to Section 
6.1(b) (unless the PROVISO to the first sentence of that Section is 
applicable to the action), the Company and the holders of at least a majority 
of the Warrants issued to the Warrantholders that are then outstanding shall 
negotiate in good faith toward agreeing upon the value of the assets or 
securities and the necessary adjustment.  If no agreement can be reached 
within 14 days from the date of receipt by Required Purchasers of such 
notice, the Company and the Required Purchasers shall appoint within 21 days 
from the date of such receipt a mutually acceptable independent investment 
banking firm to determine the necessary adjustment.  Such firm shall make the 
necessary determination which shall be binding absent actual fraud or 
manifest error.  The fees of such firm for making such determination and any 
related reimbursable expenses shall be paid by the Company.

         6.3  PRESERVATION OF PURCHASE RIGHTS UPON MERGER, CONSOLIDATION, ETC.

         (a)  In the event of any merger, consolidation or other acquisition 
or business combination in which the Company is not the surviving corporation 
or in which all of the outstanding Common Stock of the Company is converted 
into, acquired or exchanged for securities, cash or property or in the event 
of the sale or other disposition of all or substantially all the assets of 
the Company, then, and in each such case, proper provision shall be made so 
that, upon the basis and upon the terms and in the manner provided in this 
Section 6.3, the holder of this Warrant Certificate, upon the exercise of any 
of its Warrants at any time after the consummation of such consolidation, 
merger, transfer, reorganization or

                                       9


reclassification, shall be entitled to receive, in lieu of shares of Common 
Stock issuable upon such exercise prior to such consummation, the stock, 
securities, cash and assets to which such holder would have been entitled 
upon such consummation if such holder had so exercised such Warrant 
immediately prior thereto, at the aggregate Exercise Price in effect for all 
shares of Common Stock issuable upon such exercise immediately prior to such 
consummation as adjusted to the time of such transaction (subject to 
adjustments subsequent to such corporate action as nearly equivalent as 
possible to the adjustments provided for in Section 6.1 above); provided, 
however, that the holder of this Warrant Certificate shall not be required to 
accept as consideration any property or securities the holding of which by 
such holder would be prohibited by any law, rule or regulation of any 
governmental entity or insurance industry regulatory body.  Such undertaking 
shall provide for adjustments, which shall be as nearly equivalent as may be 
practicable to the adjustments provided for in this Section 6; PROVIDED, 
HOWEVER, that if upon such consolidation, merger, transfer, reorganization or 
reclassification, different holders of Common Stock shall be entitled to 
receive different forms of consideration for their Common Stock, the form of 
such consideration thereafter deliverable upon the exercise of the Warrants 
shall be as determined in good faith by the Board of Directors, whose 
determination shall be conclusive; PROVIDED, HOWEVER, that it is understood 
and agreed that the Company will be merged with and into Burke (the 
"Merger"), with Burke as the surviving corporation, pursuant to the Agreement 
and Plan of Merger, dated as of August __, 1997, by and among the Company, 
Burke and the other parties thereto (the "Merger Agreement"), and, upon 
consummation of the Merger, this Warrant Certificate and the rights and 
obligations hereunder will be assumed by Burke and this Warrant Certificate 
will, by operation of law, become exercisable for a like number of shares of 
common stock of Burke, on the same terms (including Exercise Price) and 
conditions as set forth herein. The provisions of this Section 6.3 shall also 
apply to successive mergers or consolidations.

         (b)  Upon any liquidation, dissolution or winding up of the Company, 
the Holder shall receive such cash or property (less the Exercise Price) 
which the Holder would have been entitled to receive upon the happening of 
such liquidation, dissolution or winding up had the Warrants been exercised 
and the Warrant Shares issued immediately prior to the occurrence of such 
liquidation, dissolution or winding up.

         6.4  STATEMENT ON THE WARRANT.  Irrespective of any adjustments in 
the number or kind of securities purchasable upon the exercise of the Warrant 
or the Exercise Price, any Warrant Certificate theretofore or thereafter 
issued may continue to express the same price and number and any kind of 
shares as are stated in this Warrant Certificate.

         SECTION 7.  FRACTIONAL INTERESTS.  The Holder shall not be required 
to accept fractional securities on the exercise of Warrants.  If any fraction 
of a security would be issuable on the exercise of Warrants, the Holder may, 
at its option, require the Company to pay to the Holder of such Warrants an 
amount in cash equal to the fair market value of such fraction.

                                       10


         SECTION 8.  REGISTRATION.  The Holder shall, from time to time, have 
the rights, if any, with respect to registration of Warrant Shares as are set 
forth in the Registration Rights Agreement for such Warrant Shares.

         SECTION 9.  NO RIGHTS AS A SHAREHOLDER; NOTICES TO HOLDER.  Nothing 
contained in this Warrant Certificate shall be construed as conferring upon 
the Holder the right to vote or to consent or to receive notice as a 
shareholder in respect of any meeting of shareholders of the Company for the 
election of the directors of the Company or any other matter, or any rights 
whatsoever as a shareholder of the Company. If, however, at any time prior to 
the exercise of the Warrants evidenced by this Warrant Certificate, any of 
the following events shall occur:

              (a)  the Company shall declare any dividend payable in cash or in
    any securities upon its shares of Common Stock or make any distribution to
    the holders of its shares of Common Stock;

              (b)  the Company shall offer to all holders of its shares of 
    Common Stock any additional shares of Common Stock or securities 
    convertible into or exchangeable for shares of Common Stock or any right 
    to subscribe for or purchase any thereof;

              (c)  a dissolution, liquidation or winding up of the Company 
    (other than in connection with a consolidation, merger, sale, transfer or 
    lease of all or substantially all of its property, assets and business as 
    an entirety) shall be proposed; or

              (d)  any consolidation or merger to which the Company is a 
    party and for which approval of the holders of Common Stock is required, 
    or of the conveyance or transfer of all or substantially all assets of 
    the Company as, or substantially as, an entirety, or of any 
    reclassification or change of outstanding shares of Common Stock issuable 
    upon exercise of the Warrant (other than a change in par value to no par 
    value, or from no par value to par value) or as a result of a subdivision 
    or combination,

then in any one or more of said events, the Company shall give to the Holder 
the greater of 15 business days' written notice and the number of days 
written notice required to be given to shareholders with respect to such 
action prior to the applicable record date hereinafter specified, stating (i) 
the date as of which the holders of record of shares of Common Stock to be 
entitled to receive any such dividends, rights or warrants are to be 
determined or (ii) the date on which any such dissolution, liquidation, 
winding up, consolidation, merger, conveyance or transfer is expected to 
become effective and the date as of which it is expected that holders of 
record of shares of Common Stock shall be entitled to exchange their shares 
of Common Stock for securities or other property, if any, deliverable upon 
such

                                       11


reclassification, consolidation, merger, conveyance, transfer, dissolution, 
liquidation, or winding up.

         SECTION 10.  IDENTITY OF TRANSFER AGENT.  Forthwith upon the 
appointment of any Transfer Agent for the Common Stock, or any other shares 
of the Company's capital stock issuable upon the exercise of the Warrants, 
the Company shall promptly notify the Holder of the name and address of such 
Transfer Agent.

         SECTION 11.  NOTICES.  Any notice, except as provided in Section 9 
of this Warrant Certificate, or demand authorized by this Warrant Certificate 
to be given by the Holder to the Company, shall be in writing and shall be 
delivered in person or by facsimile transmission, or mailed by overnight 
courier, or otherwise delivered, to the Company, at 2250 South Tenth Street, 
San Jose, California 95112, attention of Chief Executive Officer, with a copy 
to J.F. Lehman Equity Investors I, L.P., 450 Park Avenue, New York, New York 
10022, attention of Mr. Donald Glickman.  The Company may change the address 
to which notices to it are to be delivered or mailed hereunder by notice to 
the Holder.

         Any notice pursuant to this Warrant Certificate by the Company to 
the Holder shall be in writing and shall be mailed by overnight courier or 
otherwise delivered, to the Holder at its address set forth in the Warrant 
Register.

         Notices delivered personally shall be effective at the time 
delivered by hand, notices sent by mail shall be effective when received, 
notices sent by facsimile transmission shall be effective when confirmed and 
notices sent by courier guaranteeing next day delivery shall be effective on 
the next business day after timely delivery to the courier.

         SECTION 12.  AMENDMENT AND WAIVER.  Any term, covenant, agreement or 
condition in this Warrant Certificate may be amended, or compliance therewith 
may be waived (either generally or in a particular instance and either 
retroactively or prospectively), by a written instrument or written 
instruments executed by the Company and the holders of at least 66-2/3% a 
majority of the Warrants issued to the Warrantholders that are then 
outstanding; PROVIDED, HOWEVER, that no such amendment or waiver shall change 
the number of Warrant Shares issuable under the Warrants, change the Exercise 
Price, change the period during which the Warrants may be exercised or modify 
any provision of Section 6 or this Section 12 without the consent of the 
holders of all such Warrants then outstanding or shall have a disparate and 
adverse impact on any Warrantholder.

         SECTION 13.  SUCCESSORS.  All the covenants and provisions of this 
Warrant Certificate by or for the benefit of the Company shall bind and inure 
to the benefit of its respective successors and assigns hereunder.  As set 
forth in Section 6.3(a) hereof, it is understood and agreed that the Company 
will merge with and into Burke pursuant to the Merger Agreement, with Burke 
as the surviving corporation, and upon consummation of the Merger, this 
Warrant Certificate and the rights and obligations hereunder will be assumed 
by Burke and this Warrant Certificate will, by operation of law, become 
exercisable for a like


                                       12


number of shares of common stock of Burke, on the same terms (including 
Exercise Price) and conditions as set forth herein.

         SECTION 14.  GOVERNING LAW.  This Warrant Certificate shall be 
construed in accordance with and governed by the internal laws of the State 
of California applicable to contracts executed and to be performed wholly 
within such state, without regard to the principles of conflicts or choice of 
law.

         SECTION 15.  BENEFITS OF THIS WARRANT CERTIFICATE. Nothing in this 
Warrant Certificate shall be construed to give to any person or entity other 
than the Company and the Holder any legal or equitable right, remedy or claim 
under this Warrant Certificate; and this Warrant Certificate shall be for the 
sole and exclusive benefit of this Company and the Holder.

         SECTION 16.  SURVIVAL OF RIGHTS AND DUTIES.  This Warrant 
Certificate shall terminate and be of no further force and effect on the 
earlier of 5:00 P.M. (New York City time) on the Expiration Date or the date 
on which all of the Warrants have been exercised.  Notwithstanding anything 
herein to the contrary, it is understood and agreed that the Company shall 
have the right, power and authority to cause the holders of the Warrants to 
exercise such Warrants in full in the event of the sale (by purchase, merger 
or other form of business combination) of the Company as a going concern (a 
"SALE EVENT"); PROVIDED that any Warrants that shall be outstanding at the 
time of the consummation of any such Sale Event (or at the relevant record 
date established to determine which shareholders are eligible to participate 
in such Sale Event) shall be deemed (without any further action on the part 
of the Company or any holder of the Warrants) to have been exercised 
immediately prior to the consummation of such Sale Event, with each holder 
thereof entitled to receive the same consideration as such holder would 
receive pursuant to the terms of Section 6.3.

         SECTION 17.  AGREEMENT TO BE BOUND.  The Holder acknowledges and 
hereby agrees to be bound by such terms and conditions of the Shareholders' 
Agreement as are by their terms applicable to the Holder.  Any and all 
Warrant Shares issued upon exercise hereof shall, immediately upon such 
issuance, and without further action by or on behalf of the Holder or the 
Company, become subject to such terms and conditions of the Shareholders' 
Agreement as are by their terms applicable to such Warrant Shares.

         SECTION 17.  CAPTIONS.  The captions of the Sections and paragraphs 
of this Warrant Certificate have been inserted for convenience only and shall 
have no substantive effect.

                                      13


         IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to
be duly executed this 20th day of August 1997.

                             BURKE INDUSTRIES, INC.


                             By: _________________________________
                                 Rocco C. Genovese, President

















                                      14


                         FORM OF ELECTION TO PURCHASE

         (To Be Executed by the Holder if the Holder Desires to Exercise 
Warrants Evidenced by the Foregoing Warrant Certificate)

To JFL Merger Co.:

         The undersigned hereby irrevocably elects to exercise ____________ 
Warrants evidenced by the foregoing Warrant Certificate for, and to purchase 
thereunder, ____________ full shares of Common Stock issuable upon exercise 
of said Warrants and delivery of $_____ in cash (or in liquidation preference 
of the Series A 11.5% Cumulative Redeemable Preferred Stock of the Company, 
or any combination thereof) with and any applicable taxes payable by the 
undersigned pursuant to such Warrant Certificate.

         The undersigned requests that certificates for such shares be issued 
in the name of ____________________________.

                                  PLEASE INSERT SOCIAL SECURITY 
                                  OR TAX IDENTIFICATION NUMBER

(Please print name and address)   ____________________________________

                                  ____________________________________

                                  ____________________________________

         If said number of Warrants shall not be all the Warrants evidenced 
by the foregoing Warrant Certificate, the undersigned requests that a new 
Warrant Certificate evidencing the Warrants not so exercised be issued in the 
name of and delivered to:

       ________________________________________________________________________

       ________________________________________________________________________
                           (Please print name and address)

                                           

                                           By: ______________________________
                                               Name:
                                               Title:

Dated:  __________________



                              FORM OF ASSIGNMENT


         FOR VALUE RECEIVED, _____________________ hereby sells, assigns and 
transfers to each assignee set forth below all of the rights of the 
undersigned in and to the number of Warrants (as defined in and evidenced by 
the foregoing Warrant Certificate) set opposite the name of such assignee 
below and in and to the foregoing Warrant Certificate with respect to said 
Warrants and the shares of Common Stock issuable upon exercise of said 
Warrants:

          NAME OF ASSIGNEE        ADDRESS        NUMBER OF WARRANTS   
          ----------------        -------        ------------------


         If the total of said Warrants shall not be all the Warrants 
evidenced by the foregoing Warrant Certificate, the undersigned requests that 
a new Warrant Certificate evidencing the Warrants not so assigned be issued 
in the name of and delivered to the undersigned.


                                       By: ______________________________
                                           Name:
                                           Title:

Dated: __________________