EXHIBIT 4.2

            THE REGISTERED HOLDER OF THIS WARRANT, BY ITS ACCEPTANCE
            HEREOF, AGREES THAT IT WILL NOT SELL, TRANSFER OR ASSIGN
                     THIS WARRANT EXCEPT AS HEREIN PROVIDED.

              VOID AFTER 5:00 P.M. EASTERN TIME, DECEMBER 10, 2001

                                     WARRANT

                               For the Purchase of

                          85,000 Shares of Common Stock

                                       of

                         H.E.R.C. PRODUCTS INCORPORATED


I.       Warrant.

         THIS  CERTIFIES  THAT,  in  consideration  of $10.00 and other good and
valuable consideration,  duly paid by or on behalf of Perrin, Holden & Davenport
Capital Corp.  ("PHD" or  "Holder"),  as  registered  owner of this Warrant,  to
H.E.R.C.  Products Incorporated  ("Company"),  older is entitled, at any time or
from time to time at or after,  December 17, 1996 ("Commencement  Date"), and at
or before 5:00 p.m., Eastern Time December 10, 2001 ("Expiration Date"), but not
thereafter,  to subscribe for, purchase and receive,  in whole or in part, up to
eighty-five  thousand  (85,000) shares of Common Stock of the Company,  $.01 par
value  ("Common  Stock").  If the  Expiration  Date  is a day on  which  banking
institutions are authorized by law to close,  then this Warrant may be exercised
on the next  succeeding day which is not such a day in accordance with the terms
herein.  During the period ending on the Expiration Date, the Company agrees not
to take any action that would  terminate the Warrant.  This Warrant is initially
exercisable  at $3.00 per share of Common Stock  purchased;  provided,  however,
that upon the occurrence of any of the events specified in Section 6 hereof, the
rights  granted by this Warrant,  including the exercise price and the number of
shares of Common Stock to be received upon such  exercise,  shall be adjusted as
therein  specified.  The term "Exercise  Price" shall mean the initial  exercise
price or the adjusted  exercise price,  depending on the context,  of a share of
Common  Stock.  The term  "Securities"  shall  mean the  shares of Common  Stock
issuable  upon  exercise  of this  Warrant.  This  Warrant  is being  issued  in
connection  with  the  offering  (the  "Offering")  by the  Company  of  Class A
Preferred  Stock,  in which  PHD has  acted as the  exclusive  placement  agent.
Capitalized  terms  used  herein,  but not  otherwise  defined,  shall  have the
meanings  set forth in the Agency  Agreement  between PHD and the  Company  with
respect to the Offering.

II.      Exercise.

     1. Exercise  Form.  In order to exercise  this  Warrant,  the exercise form
attached  hereto  must be duly  executed  and  completed  and  delivered  to the
Company,  together  with this Warrant and payment of the Exercise  Price for the
Securities being purchased.  If the subscription rights represented hereby shall
not be exercised at or before 5:00 p.m.,  Eastern time, on the Expiration  Date,
this Warrant shall become and be void without  further force or effect,  and all
rights represented hereby shall cease and expire.




                                        1





     2. Legend.  Each  certificate  for Securities  purchased under this Warrant
shall bear a legend as follows,  unless  such  Securities  have been  registered
under the Securities Act of 1933, as amended ("Act"):

         "The  securities   represented  by  this   certificate  have  not  been
         registered  under the  Securities  Act of 1933,  as amended  ("Act") or
         applicable  state law. The securities may not be offered for sale, sold
         or otherwise  transferred except pursuant to an effective  registration
         statement under the Act, or pursuant to an exemption from  registration
         under the Act and applicable state law."

     3. Conversion Right.

                  (a)  Determination  of Amount.  In lieu of the  payment of the
Exercise Price in cash, the Holder shall have the right (but not the obligation)
to convert this  Warrant,  in whole or in part,  into Common Stock  ("Conversion
Right"),  as follows:  upon exercise of the Conversion  Right, the Company shall
deliver to the  Holder  (without  payment  by the Holder of any of the  Exercise
Price) that number of shares of Common Stock equal to the  quotient  obtained by
dividing (x) the "Value" (as defined  below) of the portion of the Warrant being
converted at the time the Conversion Right is exercised by (y) the Market Price.
The  "Value" of the  portion of the  Warrant  being  converted  shall  equal the
remainder  derived from  subtracting  (a) the Exercise  Price  multiplied by the
number of shares of Common  Stock being  converted  from (b) the Market Price of
the  Common  Stock  multiplied  by the  number of shares of Common  Stock  being
converted.  As used herein,  the term "Market Price" at any date shall be deemed
to be the last reported sale price of the Common Stock on such date, or, in case
no such  reported sale takes place on such day, the average of the last reported
sale prices for the immediately  preceding three trading days, in either case as
officially  reported by the  principal  securities  exchange on which the Common
Stock is listed or admitted to trading, or, if the Common Stock is not listed or
admitted to trading on any national  securities exchange or if any such exchange
on which the Common Stock is listed is not its  principal  trading  market,  the
last reported sale price as furnished by the National  Association of Securities
Dealers,  Inc.  ("NASD")  through the Nasdaq National Market or SmallCap Market,
or, if applicable,  the OTC Bulletin Board, or if the Common Stock is not listed
or admitted to trading on any of the foregoing markets, or similar organization,
as  determined  in good faith by  resolution  of the Board of  Directors  of the
Company, based on the best information available to it.

                  (b) Exercise of Conversion  Right. The Conversion Right may be
exercised by the Holder on any business  day on or after the  Commencement  Date
and not later than the  Expiration  Date by  delivering  the Warrant with a duly
executed exercise form attached hereto with the conversion  section completed to
the Company,  exercising the Conversion Right and specifying the total number of
shares of Common Stock the Holder will purchase pursuant to such conversion.

III.     Transfer.

         1. General Restrictions.  The registered Holder of this Warrant, by its
acceptance  hereof,  agrees  that  it will  not  sell,  transfer  or  assign  or
hypothecate  this Warrant to anyone except upon compliance  with, or pursuant to
exemptions  from,  applicable  securities  laws.  In order to make any permitted
assignment,  the Holder must deliver to the Company the assignment form attached
hereto duly  executed and  completed,  together with this Warrant and payment of
all transfer taxes, if any, payable in connection  therewith.  The Company shall
immediately  transfer this Warrant on the books of the Company and shall execute
and deliver



                                        2





a new Warrant or Warrants of like tenor to the appropriate assignee(s) expressly
evidencing the right to purchase the aggregate  number of shares of Common Stock
purchasable hereunder or such portion of such number as shall be contemplated by
any such assignment.

         2.  Restrictions  Imposed by the  Securities  Act. This Warrant and the
Securities underlying this Warrant shall not be transferred unless and until (i)
the  Company  has  received  the  opinion  of counsel  for the Holder  that such
securities may be sold pursuant to an exemption from registration under the Act,
and  applicable  state law,  the  availability  of which is  established  to the
reasonable  satisfaction  of  the  Company,  or  (ii) a  registration  statement
relating to such Securities has been filed by the Company and declared effective
by the Securities and Exchange  Commission and compliance with applicable  state
law.

IV.      New Warrants to be Issued.

         1. Partial Exercise or Transfer. Subject to the restrictions in Section
3 hereof,  this Warrant may be exercised or assigned in whole or in part. In the
event of the exercise or assignment  hereof in part only, upon surrender of this
Warrant for cancellation, together with the duly executed exercise or assignment
form and funds (or conversion  equivalent)  sufficient to pay any Exercise Price
and/or  transfer  tax,  the Company  shall cause to be  delivered  to the Holder
without  charge a new  Warrant of like tenor to this  Warrant in the name of the
Holder  evidencing  the right of the Holder to purchase the aggregate  number of
shares of Common  Stock and  Warrants  purchasable  hereunder  as to which  this
Warrant has not been exercised or assigned.

         2.  Lost   Certificate.   Upon  receipt  by  the  Company  of  evidence
satisfactory to it of the loss, theft, destruction or mutilation of this Warrant
and of reasonably  satisfactory  indemnification,  the Company shall execute and
deliver a new Warrant of like tenor and date. Any such new Warrant  executed and
delivered  as a result of such loss,  theft,  mutilation  or  destruction  shall
constitute a substitute contractual obligation on the part of the Company.

V.       Registration Obligation.

         1. Filing of Registration  Statement.  The Company shall register under
the  registration  statement  ("Registration  Statement")  to be  filed  for the
subscribers for shares of Preferred Stock in the Offering,  the shares of Common
Stock underlying this Warrant ("Registrable Securities"). The Company shall file
the  Registration  Statement on or before the 30-day  anniversary of the Initial
Closing of the  Offering.  The  Company  shall use its best  efforts to have the
Registration Statement declared effective by February 14, 1997 and undertakes to
have it declared  effective  by April 15, 1997.  The Company  shall bear all the
expenses  and pay all the fees it incurs  in  connection  with the  preparation,
filing and modification or amendment of the Registration Statement.  The Company
shall  keep the  Registration  Statement  effective  and  current  until all the
Registrable  Securities are sold or until all such securities may be sold by the
holders  thereof  under  Rule  144,  without  volume  limitations.   During  any
consecutive  365-day  period,  the Company may suspend the  availability  of the
Registration Statement for no more than two periods of up to 20 consecutive days
and for no more than an aggregate of 40 days during any 365-day  period,  if the
Company's  Board  of  Directors  determines,  based  upon the  opinion  of legal
counsel, that there is a valid purpose for such suspension.



                                        3






         2.       General Terms

     (a) Indemnification.

     a. The Company shall indemnify the Holder(s) of the Registrable  Securities
to be sold pursuant to any registration  statement hereunder and any underwriter
or person deemed to be an underwriter under the Act and each person, if any, who
controls  such  Holders or  underwriters  or persons  deemed to be  underwriters
within the meaning of Section 15 of the Act or Section  20(a) of the  Securities
Exchange Act of 1934,  as amended  ("Exchange  Act"),  against all loss,  claim,
damage, expense or liability (including all reasonable attorneys' fees and other
expenses  reasonably  incurred in investigating,  preparing or defending against
any claim whatsoever) to which any of them may become subject under the Act, the
Exchange  Act or  otherwise,  arising  from  such  registration  statement.  The
Holder(s) of the Registrable Securities to be sold pursuant to such registration
statement,  and their successors and assigns, shall severally,  and not jointly,
indemnify the Company,  against all loss,  claim,  damage,  expense or liability
(including all reasonable attorneys' fees and other expenses reasonably incurred
in investigating,  preparing or defending against any claim whatsoever) to which
they may become  subject under the Act, the Exchange Act or  otherwise,  arising
from  information  furnished by or on behalf of such  Holders,  in writing,  for
specific inclusion in such registration statement.

     b. If any action is brought against a party hereto,  ("Indemnified  Party")
in  respect  of  which   indemnity  may  be  sought   against  the  other  party
("Indemnifying   Party"),   such   Indemnified   Party  shall  promptly   notify
Indemnifying Party in writing of the institution of such action and Indemnifying
Party shall assume the defense of such action, including the employment and fees
of counsel  reasonably  satisfactory to the Indemnified  Party. Such Indemnified
Party  shall have the right to employ its or their own counsel in any such case,
but the fees and  expenses  of such  counsel  shall  be at the  expense  of such
Indemnified  Party unless (i) the  employment  of such  counsel  shall have been
authorized in writing by  Indemnifying  Party in connection  with the defense of
such  action,  or (ii)  Indemnifying  Party shall not have  employed  counsel to
defend such action,  or (iii) such Indemnified  Party shall have been advised by
counsel that there may be one or more legal  defenses  available to it which may
result in a conflict between the Indemnified  Party and  Indemnifying  Party (in
which case Indemnifying  Party shall not have the right to direct the defense of
such action on behalf of the  Indemnified  Party),  in any of which events,  the
reasonable  fees and expenses of not more than one additional  firm of attorneys
designated in writing by the  Indemnified  Party shall be borne by  Indemnifying
Party. Notwithstanding anything to the contrary contained herein, if Indemnified
Party shall  assume the defense of such action as provided  above,  Indemnifying
Party shall not be liable for any settlement of any such action effected without
its written consent.

     c. If the  indemnification  or  reimbursement  provided  for  hereunder  is
finally  judicially  determined  by a  court  of  competent  jurisdiction  to be
unavailable  to an  Indemnified  Party (other than as a  consequence  of a final
judicial  determination of willful misconduct,  bad faith or gross negligence of
such Indemnified Party), then Indemnifying Party agrees, in lieu of indemnifying
such  Indemnified  Party,  to  contribute  to the amount paid or payable by such
Indemnified  Party (i) in such  proportion  as is  appropriate  to  reflect  the
relative benefits received,  or sought to be received,  by Indemnifying Party on
the one hand and by such Indemnified Party on the other or (ii) if (but only if)
the  allocation  provided  in clause (i) of this  sentence is not  permitted  by
applicable  law, in such  proportion as is  appropriate  to reflect not only the
relative  benefits referred to in such clause (i) but also the relative fault of
Indemnifying Party and of such Indemnified Party; provided,  however, that in no
event shall the aggregate



                                        4





amount  contributed by a Holder exceed the profit, if any, earned by such Holder
as a result of the  exercise by him of the  Warrants  and the sale by him of the
underlying shares of Common Stock.

     d.  The  rights  accorded  to  Indemnified  Parties  hereunder  shall be in
addition  to any rights  that any  Indemnified  Party may have at common law, by
separate agreement or otherwise.

     (b)  Exercise of  Warrants.  Nothing  contained  in this  Warrant  shall be
construed as requiring  the  Holder(s) to exercise  their  Warrants  prior to or
after the initial  filing of any  registration  statement  or the  effectiveness
thereof.

VI.      Adjustments

     1.  Adjustments to Exercise  Price and Number of  Securities.  The Exercise
Price and the number of shares of Common Stock  underlying this Warrant shall be
subject to adjustment from time to time as hereinafter set forth:

                  (a)  Stock  Dividends  -  Recapitalization,  Reclassification,
Split-Ups.  If, after the date hereof,  and subject to the provisions of Section
6.2 below,  the number of  outstanding  shares of Common Stock is increased by a
stock  dividend on the Common  Stock  payable in shares of Common  Stock or by a
split-up,  recapitalization  or  reclassification  of shares of Common  Stock or
other similar event,  then, on the effective date thereof,  the number of shares
of Common  Stock  issuable on exercise of this  Warrant  shall be  increased  in
proportion to such increase in outstanding shares.

                  (b)  Aggregation  of  Shares.  If after the date  hereof,  and
subject to the  provisions of Section 6.3, the number of  outstanding  shares of
Common Stock is decreased by a consolidation, combination or reclassification of
shares of Common Stock or other similar  event,  then,  upon the effective  date
thereof,  the number of shares of Common  Stock  issuable  on  exercise  of this
Warrant shall be decreased in proportion to such decrease in outstanding shares.

                  (c)  Adjustments  in Exercise  Price.  Whenever  the number of
shares  of  Common  Stock  purchasable  upon the  exercise  of this  Warrant  is
adjusted,  as provided in this Section 6.1, the Exercise Price shall be adjusted
(to the nearest cent) by multiplying  such Exercise Price  immediately  prior to
such  adjustment by a fraction (x) the numerator of which shall be the number of
shares of Common Stock purchasable upon the exercise of this Warrant immediately
prior to such  adjustment,  and (y) the denominator of which shall be the number
of shares of Common Stock so purchasable immediately thereafter.

                  (d)  Replacement of Securities  upon  Reorganization,  etc. In
case of any  reclassification  or  reorganization  of the outstanding  shares of
Common Stock other than a change covered by Section 6.1.1 hereof or which solely
affects  the par value of such  shares of  Common  Stock,  or in the case of any
merger or consolidation of the Company with or into another  corporation  (other
than  a  consolidation  or  merger  in  which  the  Company  is  the  continuing
corporation and which does not result in any  reclassification or reorganization
of the  outstanding  shares  of  Common  Stock),  or in the  case of any sale or
conveyance to another corporation or entity of the property of the Company as an
entirety or substantially as an entirety in connection with which the Company is
dissolved, the Holder of this Warrant shall have the right thereafter (until the
expiration of the right of exercise of this Warrant) to receive upon the



                                        5





exercise  hereof,  for the  same  aggregate  Exercise  Price  payable  hereunder
immediately prior to such event, the kind and amount of shares of stock or other
securities or property  (including cash) receivable upon such  reclassification,
reorganization,  merger or  consolidation,  or upon a dissolution  following any
such sale or other transfer, by a Holder of the number of shares of Common Stock
of the Company  obtainable  upon exercise of this Warrant  immediately  prior to
such event;  and if any  reclassification  also results in a change in shares of
Common Stock covered by Sections 6.1.1 or 6.1.2,  then such adjustment  shall be
made  pursuant to Sections  6.1.1,  6.1.2,  6.1.3 and this  Section  6.1.4.  The
provisions   of  this  Section  6.1.4  shall   similarly   apply  to  successive
reclassifications,  reorganizations,  mergers or consolidations,  sales or other
transfers.

     (e)  Changes in Form of Warrant.  This form of Warrant  need not be changed
because of any change  pursuant to this Section,  and Warrants issued after such
change may state the same Exercise Price and the same number of shares of Common
Stock and Warrants as are stated in the Warrants  initially  issued  pursuant to
this  Agreement.  The  acceptance  by any Holder of the issuance of new Warrants
reflecting  a required  or  permissive  change  shall not be deemed to waive any
rights to a prior adjustment or the computation thereof.

         2.  Elimination  of  Fractional  Interests.  The  Company  shall not be
required to issue certificates  representing fractions of shares of Common Stock
upon the  exercise of this  Warrant,  nor shall it be required to issue scrip or
pay cash in lieu of any fractional interests, it being the intent of the parties
that all fractional interests shall be eliminated by rounding any fraction up to
the  nearest  whole  number  of  shares  of  Common  Stock or other  securities,
properties or rights.

VII.  Reservation  and Listing.  The Company shall at all times reserve and keep
available out of its authorized  shares of Common Stock,  solely for the purpose
of issuance upon exercise of this Warrant, such number of shares of Common Stock
or other securities, properties or rights as shall be issuable upon the exercise
thereof.  The Company  covenants and agrees that,  upon exercise of the Warrants
and payment of the Exercise Price therefor, all shares of Common Stock and other
securities  issuable upon such exercise shall be duly and validly issued,  fully
paid and non-assessable and not subject to preemptive rights of any stockholder.
As long as the Warrants  shall be  outstanding,  the Company  shall use its best
efforts  to cause all  shares of Common  Stock  issuable  upon  exercise  of the
Warrants to be listed (subject to official notice of issuance) on all securities
exchanges (or, if applicable on Nasdaq) on which the Common Stock is then listed
and/or quoted.

VIII.    Certain Notice Requirements.

         1. Holder's Right to Receive Notice.  Nothing herein shall be construed
as conferring upon the Holders the right to vote or consent or to receive notice
as a stockholder for the election of directors or any other matter, or as having
any rights whatsoever as a stockholder of the Company.  If, however, at any time
prior to the  expiration of the Warrants and their  exercise,  any of the events
described in Section 8.2 shall occur,  then, in one or more of said events,  the
Company  shall give written  notice of such event at least fifteen days prior to
the date fixed as a record  date or the date of closing the  transfer  books for
the determination of the stockholders  entitled to such dividend,  distribution,
conversion or exchange of securities or subscription rights, or entitled to vote
on such proposed dissolution, liquidation, winding up or sale. Such notice shall
specify  such record date or the date of the closing of the transfer  books,  as
the case may be.




                                        6





         2. Events Requiring  Notice.  The Company shall be required to give the
notice described in this Section 8 upon one or more of the following events: (i)
if the Company  shall take a record of the holders of its shares of Common Stock
for the purpose of entitling them to receive a dividend or distribution  payable
otherwise  than in cash, or a cash dividend or  distribution  payable  otherwise
than out of retained earnings,  as indicated by the accounting treatment of such
dividend or distribution on the books of the Company,  or (ii) the Company shall
offer to all the holders of its Common  Stock any  additional  shares of capital
stock of the Company or securities  convertible  into or exchangeable for shares
of capital  stock of the Company,  or any option,  right or warrant to subscribe
therefor,  or (iii) a merger or  reorganization  in which the Company is not the
surviving party, or (iv) a dissolution, liquidation or winding up of the Company
(other than in connection  with a  consolidation  or merger) or a sale of all or
substantially all of its property, assets and business shall be proposed.

         3. Notice of Change in Exercise  Price.  The  Company  shall,  promptly
after an event  requiring a change in the Exercise  Price  pursuant to Section 6
hereof,  send notice to the Holders of such event and change  ("Price  Notice").
The Price Notice shall  describe the event  causing the change and the method of
calculating  same and  shall be  certified  as being  true and  accurate  by the
Company's President and Chief Financial Officer.

         4. Transmittal of Notices.  All notices,  requests,  consents and other
communications  under this  Warrant  shall be in writing  and shall be deemed to
have been duly made on the date of delivery if delivered  personally  or sent by
overnight courier,  with  acknowledgment of receipt by the party to which notice
is  given,  or on the fifth  day  after  mailing  if mailed to the party to whom
notice  is  to be  given,  by  registered  or  certified  mail,  return  receipt
requested,  postage  prepaid and properly  addressed  as follows:  (i) if to the
registered Holder of this Warrant, to the address of such Holder as shown on the
books of the Company,  or (ii) if to the  Company,  to its  principal  executive
office.

IX.      Miscellaneous.

     1.  Headings.  The  headings  contained  herein are for the sole purpose of
convenience  of reference,  and shall not in any way limit or affect the meaning
or interpretation of any of the terms or provisions of this Warrant.

     2. Entire  Agreement.  This Warrant (together with the other agreements and
documents  being  delivered  pursuant  to or in  connection  with this  Warrant)
constitutes  the entire  agreement  of the parties  hereto  with  respect to the
subject matter hereof, and supersedes all prior agreements and understandings of
the parties, oral and written, with respect to the subject matter hereof.

     3. Binding  Effect.  This Warrant  shall inure solely to the benefit of and
shall  be  binding  upon,  the  Holder  and the  Company  and  their  respective
successors, legal representatives and assigns, and no other person shall have or
be construed to have any legal or equitable  right,  remedy or claim under or in
respect of or by virtue of this Warrant or any provisions herein contained.

     4.  Governing  Law;  Submission  to  Jurisdiction.  This  Warrant  shall be
governed by and construed  and enforced in accordance  with the law of the State
of New York,  without  giving  effect to  conflict of laws.  The Company  hereby
agrees  that any  action,  proceeding  or claim  against it  arising  out of, or
relating in any way to this Warrant  shall be brought and enforced in the courts
of the State of New York or of the  United  States of America  for the  Southern
District



                                        7





of New York, and irrevocably  submits to such  jurisdiction,  which jurisdiction
shall be exclusive.  The Company  hereby waives any objection to such  exclusive
jurisdiction and that such courts  represent an inconvenient  forum. Any process
or summons to be served upon the Company  may be served by  transmitting  a copy
thereof by registered  or certified  mail,  return  receipt  requested,  postage
prepaid,  addressed  to it at the  address  set forth in Section 8 hereof.  Such
mailing shall be deemed personal service and shall be legal and binding upon the
Company  in any  action,  proceeding  or  claim.  The  Company  agrees  that the
prevailing  party(ies)  in any such action shall be entitled to recover from the
other party(ies) all of its reasonable  attorneys' fees and expenses relating to
such action or proceeding  and/or  incurred in connection  with the  preparation
therefor.

     5.  Waiver,  Etc.  The  failure of the Company or the Holder to at any time
enforce any of the  provisions  of this Warrant shall not be deemed or construed
to be a waiver of any such  provision,  nor to in any way affect the validity of
this Warrant or any  provision  hereof or the right of the Company or any Holder
to thereafter enforce each and every provision of this Warrant. No waiver of any
breach,  non-compliance  or  non-fulfillment  of any of the  provisions  of this
Warrant shall be effective unless set forth in a written instrument  executed by
the party or parties against whom or which enforcement of such waiver is sought;
and no waiver of any such breach,  non-compliance  or  non-fulfillment  shall be
construed  or  deemed  to  be a  waiver  of  any  other  or  subsequent  breach,
non-compliance or non-fulfillment.

         IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by
its duly authorized officer as of the 7th day of December, 1996.

                                               H.E.R.C. PRODUCTS INCORPORATED


                                                 By:      /s/ Gary S. Glatter
                                                      -------------------------
                                                       Name: Gary S. Glatter
                                                       Title:    President




                                        8





Form to be used to exercise Warrant:

H.E.R.C. Products Incorporated
2202 West Lone Cactus Drive, #15
Phoenix, Arizona 85027



Date:  _____________________, 19___

                  The  undersigned  hereby  elects  irrevocably  to exercise the
within  Warrant  and to  purchase  ________  shares of Common  Stock of H.E.R.C.
Products  Incorporated and hereby makes payment of $____________ (at the rate of
$_________  per share of Common Stock) in payment of the Exercise Price pursuant
thereto.  Please issue the Common Stock as to which this Warrant is exercised in
accordance with the instructions given below.

                                       or

                  The undersigned hereby elects irrevocably to convert its right
to purchase  ____________  shares of Common Stock  purchasable  under the within
Warrant into __________ shares of Common Stock of H.E.R.C. Products Incorporated
(based on a "Market Price" of $________ per share of Common Stock). Please issue
the Common Stock in accordance with the instructions given below.


                                    --------------------------------------
                                    Signature


- ---------------------------
Signature Guaranteed

                  NOTICE:  The signature to this form must  correspond  with the
name as written upon the face of the within Warrant in every particular  without
alteration or enlargement or any change whatsoever,  and must be guaranteed by a
bank,  other than a savings  bank,  or by a trust  company  or by a firm  having
membership on a registered national securities exchange.

                   INSTRUCTIONS FOR REGISTRATION OF SECURITIES


Name              ________________________________________________________
                            (Print in Block Letters)


Address           ________________________________________________________
Form to be used to assign Warrant:



                                        9





                                   ASSIGNMENT


                  (To be executed by the registered  Holder to effect a transfer
                   of the within Warrant):

                  FOR  VALUE  RECEIVED,   ________________________________  does
hereby sell,  assign and  transfer  unto  _________________________________  the
right to  purchase  _____________________  shares  of Common  Stock of  H.E.R.C.
Products  Incorporated  ("Company")  evidenced  by the within  Warrant  and does
hereby authorize the Company to transfer such right on the books of the Company.


Dated:____________________, 19___



                                    --------------------------------------
                                    Signature






                  NOTICE:  The signature to this form must  correspond  with the
name as written upon the face of the within Warrant in every particular  without
alteration or enlargement or any change whatsoever.



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