EXHIBIT 4.1
                             SUBSCRIPTION AGREEMENT


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

Ladies and Gentlemen:


         Subscription. I (sometimes referred to herein as the "Investor") hereby
subscribe for and agree to purchase  $___________ of shares of Class A Preferred
Stock , $.01 par value ("Preferred Stock"), of H.E.R.C. Products Incorporated, a
Delaware corporation ("Company"),  on the terms and conditions set forth herein.
The per share offering price is $10.00 ("Share  Price") and the number of shares
of  Preferred  Stock being  purchased by me will be  calculated  by dividing the
above dollar amount by the per share offering price. Perrin,  Holden & Davenport
Capital  Corp.  ("PHD")  is acting  as the  exclusive  placement  agent for this
offering ("Placement Agent").

           Description  of  Preferred  Stock.  The rights of each share of
Preferred  Stock are as set forth in the  Certificate of  Designations  which is
included as Exhibit A in the Disclosure Package given to you simultaneously with
this Agreement ("Disclosure Package").

                   Purchase.

                  I hereby tender (i) the purchase price by wire transfer
to the following  account  ("Account")  maintained  by the Company's  attorneys,
Graubard Mollen & Miller:

                 Bankers Trust Company
                 280 Park Avenue
                 New York, New York  10017
                 ABA No.:  021001033
                 Attention:  Florence Blanchard
                 For further credit to:    Graubard Mollen & Miller
                                           Attorney Trust Account No. 42834468,

and (ii) two executed copies of this Subscription  Agreement and one copy of the
Subscriber  Questionnaire  to the Placement Agent at Perrin,  Holden & Davenport
Capital Corp., 17 John Street,  3rd Floor, New York, New York 10038,  Attention:
Mr. Jody Eisenman.

                   This offering  will  continue  until the earlier of the
Final Closing (as defined in Section 4 hereof) or November 30, 1996, unless such
latter date is extended,  without  notice to the Investor,  by mutual consent of
PHD and the Company to a date not later than  December  15,  1996  ("Termination
Date").  Prior  to the  earlier  of the  closing,  if any,  with  respect  to my
subscription or the Termination Date, my payment for the Preferred Stock will be
held by  Graubard  Mollen & Miller  in the  Account  subject  to the  terms  and
conditions  herein.  If subscriptions for at least $1,000,000 of Preferred Stock
are not received and accepted by the Company by the Termination Date, my payment
will be returned  to me without  interest  or  deduction.  Upon the earlier of a
closing for my  subscription  or completion of the offering,  I will be notified
promptly by the Company as to whether my subscription has been accepted.


                                        5





                  Acceptance or Rejection of Subscription.

      The Company and PHD have the right to reject this  subscription  for
the Preferred Stock, in whole or in part for any reason and at any time prior to
a Closing (as defined in Section 4 hereof),  notwithstanding prior receipt by me
of notice of acceptance of my subscription.

      In the event of the rejection of this subscription,  my subscription
payment will be promptly  returned to me without  interest or deduction and this
Subscription  Agreement  shall  have  no  force  or  effect.  In  the  event  my
subscription  is accepted and the  offering is  completed,  the funds  specified
above shall be released to the  Company and the  certificates  representing  the
Preferred Stock will be promptly delivered to me.

          Closing.  The initial  closing of this offering may occur at any
time after the sale by the Company of  Preferred  Stock  aggregating  $1,000,000
("Initial  Closing"),  as determined jointly by the Company and PHD. Thereafter,
closings may occur from time to time, as  determined  jointly by the Company and
PHD,  until  Preferred  Stock  aggregating  $1,500,000  have been  sold  ("Final
Closing" and, with the Initial Closing and any interim closing,  a "Closing") or
the Termination Date,  whichever occurs sooner.  Notwithstanding  the foregoing,
PHD, with the Company's  consent,  will be able to adjourn any Closing until the
Termination Date to enable it to continue to obtain subscriptions for additional
Preferred  Stock up to the  maximum  number of shares of  Preferred  Stock being
offered by the Company in this  offering.  The Preferred  Stock  subscribed  for
herein  shall  not be deemed  issued to or owned by me until two  copies of this
Subscription Agreement have been executed by me and countersigned by the Company
and a Closing with respect to such Preferred Stock has occurred.

          Issuance  of  Securities.  At each  Closing,  the  Company  will
deliver the certificates  representing the Preferred Stock to me or my agent for
deposit  into my personal  securities  account at PHD or for delivery to me. The
certificates  representing  the Preferred  Stock and the common stock,  $.01 par
value,  of the  Company  ("Common  Stock")  into  which the  Preferred  Stock is
convertible shall be legended as follows:

                  THE SECURITIES  REPRESENTED BY THIS  CERTIFICATE HAVE NOT BEEN
                  REGISTERED  UNDER  THE  SECURITIES  ACT OF  1933,  AS  AMENDED
                  ("ACT") OR  APPLICABLE  STATE  SECURITIES  LAWS AND MAY NOT BE
                  SOLD, PLEDGED,  OR OTHERWISE  TRANSFERRED WITHOUT AN EFFECTIVE
                  REGISTRATION  STATEMENT WITH RESPECT  THERETO UNDER THE ACT OR
                  PURSUANT TO AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF
                  SAID ACT AND COMPLIANCE WITHIN ANY APPLICABLE STATE SECURITIES
                  LAW,  OR UNLESS THE  COMPANY  RECEIVES  AN OPINION OF COUNSEL,
                  SATISFACTORY   TO  THE  COMPANY  AND  ITS  COUNSEL  THAT  SUCH
                  REGISTRATION IS NOT REQUIRED.

                  After the  Registration  Statement,  referenced  in  Section 6
hereinbelow,  is declared  effective by the Securities and Exchange  Commission,
the Investor may deliver to the Company the certificate  representing the Common
Stock of the Company  issued to such Investor  upon  conversion of the Preferred
Stock and the Company  will,  within three days after  receipt by the Company of
the  foregoing,  issue a new  certificate  representing  and in exchange for the
aforementioned certificate, which new certificate shall be legended as follows:

                                        6





                  THE  SECURITIES  REPRESENTED  BY THIS  CERTIFICATE  HAVE  BEEN
                  REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED.  THE
                  SECURITIES MAY BE SOLD PURSUANT TO THE REGISTRATION  STATEMENT
                  PROVIDED  THAT (i) THE  REGISTRATION  STATEMENT IS CURRENT AND
                  EFFECTIVE,  (ii)  THE  HOLDER  COMPLIES  WITH  THE  PROSPECTUS
                  DELIVERY  REQUIREMENTS  UNDER THE  SECURITIES  ACT OF 1933, AS
                  AMENDED,  AND (iii) THE SALE IS IN COMPLIANCE WITH THE PLAN OF
                  DISTRIBUTION SET FORTH IN THE PROSPECTUS.

                    Registration Rights.

                    The  Company  agrees  with  the  Investor  and  PHD to
register  under  a  registration  statement  ("Registration   Statement")  filed
pursuant to the Securities Act of 1933, as amended  ("Securities  Act") and such
state  "Blue  Sky"  laws of  those  states  as are  reasonably  selected  by the
Investor,  the  shares of Common  Stock into  which the  Preferred  Stock may be
converted and the shares of Common Stock underlying the warrants to be issued to
PHD in connection with this sale of securities by the Company (collectively, the
"Registrable Securities"). The Company agrees to file the Registration Statement
on or before the 30-day anniversary of the Initial Closing of the Offering.  The
Company  agrees  to use its  best  efforts  to have the  Registration  Statement
declared  effective by February 14, 1997 and undertakes to have the Registration
Statement declared effective by April 15, 1997. If the Registration Statement is
not declared  effective by the close of business on April 15, 1997,  as provided
in the  Certificate  of  Designations,  the  conversion  rate  will be  lowered.
Notwithstanding the foregoing reduction in the conversion rate, the Investor may
pursue all other legal remedies available to it for the failure to file and have
declared  effective  the  Registration  Statement as agreed to by the Company in
this Agreement.  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 securities registered thereunder are sold or
until all such  securities  may be sold by the  holders  thereof  under Rule 144
without  volume   limitations.   Notwithstanding   the  foregoing,   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 valid purpose for such suspension.

                  To the extent permitted by law, the Company will indemnify and
hold harmless each holder of the Registrable Securities ("Holder"), the officers
and  directors of each Holder and each person,  if any, who controls such Holder
within the meaning of the Securities Act or Securities  Exchange Act of 1934, as
amended ("Exchange Act") against any losses, claims,  damages, or liabilities to
which they may become subject under the Securities  Act, the Exchange Act or any
state securities law or regulation (including all reasonable attorneys' fees and
other  expenses  reasonably  incurred in  investigating,  preparing or defending
against any claim whatsoever  incurred by the indemnified party in any action or
proceeding   between  the  indemnitor  and  indemnified  party  or  between  the
indemnified  party and any third  party or  otherwise)  to which any of them may
become subject under the  Securities  Act, the Exchange Act or any other statute
or common law or  otherwise  under the laws of foreign  countries,  arising from
such registration statement or based upon any untrue statement or alleged untrue
statement of a material fact contained in (i) any  preliminary  prospectus,  the
registration statement or prospectus

                                        7





(as  from  time to time  each  may be  amended  and  supplemented);  (ii) in any
post-effective  amendment or  amendments or any new  registration  statement and
prospectus  in  which it  included  the  Registrable  Securities;  or (iii)  any
application  or other  document or written  communication  (collectively  called
"application")  executed  by the  Company  or  based  upon  written  information
furnished by the Company in any jurisdiction in order to qualify the Registrable
Securities  under the  securities  laws thereof or filed with the Securities and
Exchange Commission,  any state securities  commission or agency,  Nasdaq or any
securities exchange; or the omission or alleged omission therefrom of a material
fact required to be stated therein or necessary to make the statements  therein,
in light of the circumstances under which they were made, not misleading, unless
such statement or omission is made in reliance  upon,  and in strict  conformity
with, written  information  furnished to the Company with respect to such Holder
expressly for use in any preliminary prospectus,  such registration statement or
prospectus,  or any amendment or supplement thereof,  or in any application,  as
the case may be.  The  Company  agrees  promptly  to  notify  the  Holder of the
Registrable  Securities of the  commencement  of any  litigation or  proceedings
against the Company or any of its officers,  directors or controlling persons in
connection with the issue and sale or resale of the Registrable Securities or in
connection with any such registration statement or prospectus.

      Investor Agreements  Representations and Warranties.  I acknowledge,
represent and warrant to, and agree with, the Company and the Placement Agent as
follows:

      I am aware that my investment in the Company  involves a high degree
of risk,  and I carefully have read and fully  understand  the Company's  Annual
Report on Form 10-KSB for the fiscal year ended December 31, 1995, the Company's
Quarterly  Report on Form 10-QSB for the quarter ended  September 30, 1996,  the
Company's Proxy Statement dated June 11, 1996 and the Company's Prospectus dated
June 12, 1996,  which are included as Exhibits B, C, D and E,  respectively,  in
the Disclosure Package.

      I  acknowledge  and am aware  that there is no  assurance  as to the
future performance of the Company.

      I acknowledge that  notwithstanding the Company's commitment herein,
there can be no assurance that the Company will file any Registration  Statement
for the securities I am purchasing,  that such Registration Statement, if filed,
will be declared effective or, if declared  effective,  that the Company will be
able to keep it effective until I sell the Common Stock registered thereon.

      I am  purchasing  the  Preferred  Stock  for  my  own  account  for
investment and not with view to or for sale in connection with the  distribution
of the Preferred Stock,  nor with any present  intention of selling or otherwise
disposing of all or any part of the Preferred Stock. I understand that there may
not be any market for the Preferred  Stock. I agree that (1) the purchase of the
Preferred Stock is a long-term  investment,  (2) I may have to bear the economic
risk of  investment  for an  indefinite  period  of  time  because  neither  the
Preferred  Stock nor the Common Stock  underlying the Preferred  Stock have been
registered  under  the  Securities  Act  and,   notwithstanding   the  Company's
commitment  herein,  may not be  registered  and,  cannot  be  resold,  pledged,
assigned, or otherwise disposed of unless they are subsequently registered under
said Securities Act and under applicable securities laws of certain states or an
exemption from such registration is available.  I understand that the Company is
under no  obligation to register the  Preferred  Stock and,  except as set forth
herein,  the  Company  is under no  obligation  to  register  the  Common  Stock
underlying the Preferred Stock on my behalf or to assist me in

                                        8





complying with any exemption from such registration  under the Securities Act or
any state  securities  laws.  I hereby  authorize  the Company to place  legends
denoting  the  restrictions  on the  Preferred  Stock and the Common Stock to be
issued hereunder or conversion of the Preferred Stock, as the case may be.

      I recognize that the Preferred  Stock, as an investment,  involves a
high degree of risk  including,  but not limited to, the risk of economic losses
from  operations of the Company and the total loss of my  investment.  I believe
that the  investment  in the  Preferred  Stock is suitable  for me based upon my
investment  objectives  and  financial  needs,  and I have  adequate  means  for
providing for my current  financial needs and contingencies and have no need for
liquidity with respect to my investment in the Company.

      I have been given access to full and complete information  regarding
the Company and have utilized such access to my satisfaction  for the purpose of
obtaining  information in addition to, or verifying information included in, the
Disclosure  Package,  and I have  either  met  with  or  been  given  reasonable
opportunity  to meet with  officers  of the  Company  for the  purpose of asking
questions of, and receiving answers from, such officers concerning the terms and
conditions  of  the  offering  of the  Preferred  Stock  and  the  business  and
operations  of the  Company  and to obtain any  additional  information,  to the
extent  reasonably  available.  I have  received  all  information  and material
regarding the Company that I have requested.

      I have such  knowledge  and  experience  in  financial  and business
matters as to be capable of evaluating  the merits and risks of an investment in
the Preferred Stock and have obtained,  in my judgment,  sufficient  information
from the  Company  to  evaluate  the merits  and risks of an  investment  in the
Company.  I have not  utilized  any  person as my  purchaser  representative  as
defined in Regulation D promulgated by the  Securities  and Exchange  Commission
pursuant to the Securities  Act in connection  with  evaluating  such merits and
risks.

      I have relied solely upon my own  investigation in making a decision
to invest in the Company.

     I have  received no  representation  or warranty from the Company or
the Placement Agent or any of their respective officers, directors, employees or
agents in  respect  of my  investment  in the  Company  and I have  received  no
information  (written  or  otherwise)  from them  relating to the Company or its
business other than as set forth herein and in the Disclosure  Package. I am not
participating   in  the  offer  as  a  result  of  or  subsequent  to:  (I)  any
advertisement,   article,   notice  or  other  communication  published  in  any
newspaper,  magazine or similar media or broadcast  over  television or radio or
(ii) any seminar or meeting  whose  attendees  have been  invited by any general
solicitation or general advertising.

      I  have  had  full  opportunity  to ask  questions  and to  receive
satisfactory  answers concerning the offering and other matters pertaining to my
investment and all such questions have been answered to my full satisfaction. In
addition, as required by Section 517.061(11)(a)(3), Florida Statutes and by Rule
3-500.05(a) thereunder, if I am a Florida resident I may have, at the offices of
the Company,  at any reasonable  hour, after  reasonable  notice,  access to the
materials  set  forth  in  the  Rule  which  the  Company  can  obtain   without
unreasonable effort or expense.


                                        9





      I have  been  provided  an  opportunity  to  obtain  any  additional
information concerning the offering and the Company and all other information to
the extent the  Company  possesses  such  information  or can acquire it without
unreasonable effort or expense.

      I am an "accredited investor" as defined in Section 2(15) of the Act
and in Rule 501 promulgated thereunder.

      I  understand  that  (i) the  Preferred  Stock  and  the  underlying
securities have not been registered  under the Securities Act, or the securities
laws of certain  states in reliance on specific  exemptions  from  registration,
(ii) no  securities  administrator  of any state or the federal  government  has
recommended  or endorsed  this  offering  or made any  finding or  determination
relating to the fairness of an  investment  in the Company and (iii) the Company
is relying on my  representations  and agreements for the purpose of determining
whether this transaction  meets the  requirements of the exemptions  afforded by
the Securities Act and certain state securities laws.

      I have been urged to seek  independent  advice from my  professional
advisors  relating to the suitability of an investment in the Company in view of
my overall financial needs and with respect to the legal and tax implications of
such investment.

      If the Investor is a corporation,  company,  trust, employee benefit
plan, individual retirement account,  Keogh Plan, or other tax-exempt entity, it
is authorized  and qualified to become an Investor in the Company and the person
signing  this  Subscription  Agreement  on behalf of such  entity  has been duly
authorized by such entity to do so.

      I hereby  acknowledge  and am aware that  except for any  rescission
rights that may be provided under  applicable laws, I am not entitled to cancel,
terminate or revoke this  subscription,  and any  agreements  made in connection
herewith shall survive my death or disability.

      I hereby  acknowledge  that I have  been told that (ii) PHD is being
compensated as the Placement Agent and will receive a cash  commission  equal to
10% of the aggregate  purchase price of the Preferred Stock sold in the offering
to all  Investors and will be issued a warrant to purchase that number of shares
of Common Stock that equals the number of shares of Preferred  Stock sold in the
Offering divided by two, exercisable at $3.00 per share for the five years after
the last Closing and (iii) the Common Stock underlying the warrant issued to PHD
is being registered under the Securities Act on the same registration  statement
as the  shares of Common  Stock  which will be  issuable  on  conversion  of the
Preferred Stock.

      I agree  that prior to the  conversion  of all the  Preferred  Stock
purchased hereunder,  I will not sell the Common Stock "short" on any securities
market on which the Common Stock is traded.

           Indemnification.  I hereby agree to indemnify and hold harmless
PHD and the Company, each of their respective officers, directors, shareholders,
employees,  agents, and attorneys against any and all losses,  claims,  demands,
liabilities,  and  expenses  (including  reasonable  legal  or  other  expenses,
including  reasonable  attorneys' fees and other expenses reasonably incurred in
investigating,  preparing or defending against any claim whatsoever  incurred by
the  indemnified  party in any action or proceeding  between the  indemnitor and
indemnified  party or  between  the  indemnified  party and any  third  party or
otherwise) incurred by

                                       10





each such person in connection with defending or  investigating  any such claims
or  liabilities,  whether or not resulting in any  liability to such person,  to
which any such  indemnified  party may become subject under the Securities  Act,
under any other  statute,  at common law or  otherwise,  insofar as such losses,
claims, demands, liabilities and expenses (a) arise out of or are based upon any
untrue  statement or alleged untrue  statement of a material fact made by me and
contained in this Subscription  Agreement, or (b) arise out of or are based upon
any  breach  by me of any  representation,  warranty,  or  agreement  made by me
contained  herein.  PHD is a third-party  beneficiary of this Section,  and this
Section may not be modified or amended  without the prior  written  agreement of
PHD.

           Severability.  In the  event  any  part  of  this  Subscription
Agreement are found to be void,  the remaining  provisions of this  Subscription
Agreement shall  nevertheless be binding with the same effect as though the void
parts were deleted.

          Choice of Law and Jurisdiction. This Subscription Agreement will
be deemed to have been made and  delivered in New York City and will be governed
as to validity,  interpretation,  construction, effect and in all other respects
by the internal laws of the State of New York. The Company and the Investor each
hereby (i) agrees that any legal suit,  action or  proceeding  arising out of or
relating to this Subscription  Agreement shall be instituted  exclusively in New
York State Supreme Court,  County of New York, or in the United States  District
Court for the Southern  District of New York,  (ii) waives any  objection to the
venue of any such suit,  action or proceeding  and the right to assert that such
forum is not a convenient forum,  proceeding,  and (iii) irrevocably consents to
the  jurisdiction  of the New York State Supreme Court,  County of New York, and
the United States  District  Court for the Southern  District of New York in any
such suit,  action or proceeding  and the Company  further  agrees to accept and
acknowledge service or any and all process which may be served in any such suit,
action or proceeding in New York State Supreme  Court,  County of New York or in
the United  States  District  Court for the  Southern  District  of New York and
agrees that service of process  upon it mailed by certified  mail to its address
shall be deemed in every  respect  effective  service of process  upon it in any
suit, action or proceeding.

          Counterparts. This Subscription Agreement may be executed in one
or more counterparts, each of which shall be deemed an original but all of which
together  shall  constitute one and the same  instrument.  The execution of this
Subscription Agreement may be by actual or facsimile signature.


          Benefit.  This Subscription  Agreement shall be binding upon and
inure to the  benefit  of the  parties  hereto  (and PHD to the  extent  it is a
third-party beneficiary hereof) and their respective heirs, executors,  personal
representatives, successors and assigns. PHD shall be deemed to be a third-party
beneficiary  with  respect  to any  sections  hereof  which  so  state  or which
otherwise  indicate  that PHD would be entitled to rely on the  representations,
warranties or covenants made by me therein.

          Notices and Addresses. All notices,  offers,  acceptance and any
other  acts under  this  Subscription  Agreement  (except  payment)  shall be in
writing,  and shall be  sufficiently  given if  delivered to the  addressees  in
person, by Federal Express or similar courier delivery by facsimile delivery or,
if mailed,  postage prepaid,  by certified mail,  return receipt  requested,  as
follows:


                                       11





 Investor:                  At the address designated on the signature page of
                                  this Subscription Agreement.

 The Company:               H.E.R.C. Products Incorporated
                            2202 West Lone Cactus Drive, Suite 15
                            Phoenix, Arizona 85027
                            Attention: S. Steven Carl, Chief Executive Officer
                            Fax: (602) 492-0336

 Placement Agent:           Perrin, Holden & Davenport Capital Corp.
                            17 John Street, 3rd Floor
                            New York, New York  10038
                            Attention:  Jody Eisenman
                            Fax:  (212) 566-4977

 in any case,
 with a copy to:            Graubard Mollen & Miller
                            600 Third Avenue
                            New York, New York 10016-2097
                            Attention:  David Alan Miller, Esq.
                            Fax:  (212) 818-8881

or to such other  address as any of them,  by notice to the others may designate
from time to time.  The  transmission  confirmation  receipt  from the  sender's
facsimile machine shall be conclusive evidence of successful  facsimile deliver.
Time shall be counted to, or from, as the case may be, the delivery in person or
by mailing.

          Oral  Evidence.  This  Subscription  Agreement  constitutes  the
entire  agreement  between the parties with respect to the subject matter hereof
and supersedes all prior oral and written  agreements between the parties hereto
with respect to the subject matter hereof.  This Subscription  Agreement may not
be changed,  waived,  discharged,  or terminated  orally but, rather,  only by a
statement in writing signed by the party or parties against which enforcement or
the change, waiver, discharge or termination is sought.

          Section Headings. Section headings herein have been inserted for
reference  only and shall not be deemed  to limit or  otherwise  affect,  in any
matter,  or be  deemed  to  interpret  in whole or in part,  any of the terms or
provisions of this Subscription Agreement.

          Survival of  Representations,  Warranties  and  Agreements.  The
representations,  warranties and agreements  contained  herein shall survive the
delivery of, and the payment for, the Preferred Stock.

           Acceptance  of  Subscription.  The  Company  may  accept  this
Subscription Agreement at any time for all or any portion of the Preferred Stock
subscribed  for by executing a copy hereof as provided and notifying me within a
reasonable time thereafter.

         RESIDENTS OF ALL STATES:  THE UNITS OFFERED HEREBY HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT, AS AMENDED, OR THE SECURITIES LAWS
OF ANY STATE AND ARE BEING OFFERED AND SOLD IN RELIANCE ON EXEMPTIONS
FROM THE REGISTRATION REQUIREMENTS OF SAID ACT AND SUCH LAWS.  THE UNITS

                                       12





ARE  SUBJECT  TO  RESTRICTION  ON  TRANSFERABILITY  AND  RESALE  AND  MAY NOT BE
TRANSFERRED OR RESOLD EXCEPT AS PERMITTED  UNDER SAID ACT AND SUCH LAWS PURSUANT
TO REGISTRATION OR EXEMPTION THEREFROM. INVESTORS SHOULD BE AWARE THAT THEY WILL
BE REQUIRED TO BEAR THE  FINANCIAL  RISKS OF THIS  INVESTMENT  FOR AN INDEFINITE
PERIOD  OF TIME.  THE  UNITS  HAVE  NOT  BEEN  APPROVED  OR  DISAPPROVED  BY THE
SECURITIES AND EXCHANGE  COMMISSION,  ANY STATE  SECURITIES  COMMISSION OR OTHER
REGULATORY  AUTHORITY,  NOR HAVE ANY OF THE FOREGOING AUTHORITIES PASSED UPON OR
ENDORSED  THE  MERITS  OF THE  OFFERING  OR THE  ACCURACY  OR  ADEQUACY  OF THIS
CONFIDENTIAL INVESTMENT SUMMARY. ANY REPRESENTATION TO THE CONTRARY IS UNLAWFUL.

         FOR CONNECTICUT  RESIDENTS:  THE UNITS OFFERED HAVE NOT BEEN REGISTERED
UNDER SECTION 36-485 OF THE CONNECTICUT  UNIFORM  SECURITIES ACT AND ARE OFFERED
AND SOLD  PURSUANT TO AN  EXEMPTION  RELATING TO  TRANSACTIONS  NOT  INVOLVING A
PUBLIC OFFERING PURSUANT TO SECTION 36- 490(b)(9)(A)  THEREOF.  THE UNITS CANNOT
BE RESOLD OR TRANSFERRED  UNLESS THEY ARE REGISTERED UNDER SUCH ACT OR UNLESS AN
EXEMPTION FROM REGISTRATION IS AVAILABLE.

         FOR MARYLAND RESIDENTS: THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER
THE MARYLAND  SECURITIES  ACT BY REASON OF AN EXEMPTION  RELATING TO THE LIMITED
AVAILABILITY  OF THE OFFERING.  THESE  SECURITIES MAY NOT BE TRANSFERRED OR SOLD
EXCEPT IN A  TRANSACTION  WHICH IS EXEMPT UNDER THE MARYLAND  SECURITIES  ACT OR
PURSUANT TO AN EFFECTIVE REGISTRATION.

         FOR NEW JERSEY  RESIDENTS:  THESE  SECURITIES HAVE NOT BEEN APPROVED OR
DISAPPROVED  BY THE BUREAU OF  SECURITIES OF THE STATE OF NEW JERSEY NOR HAS THE
BUREAU  PASSED ON OR  ENDORSED  THE MERITS OF THIS  OFFERING.  THE FILING OF THE
WITHIN OFFERING DOES NOT CONSTITUTE APPROVAL OF THE ISSUE OR THE SALE THEREOF BY
THE BUREAU OF SECURITIES. ANY REPRESENTATION TO THE CONTRARY IS UNLAWFUL.

         THESE ARE SPECULATIVE SECURITIES AND INVOLVE A HIGH DEGREE OF RISK.
THESE SECURITIES ARE OFFERED ONLY TO BONA FIDE ADULT RESIDENTS OF THE
STATE OF NEW JERSEY.

         FOR FLORIDA  RESIDENTS:  THE  SECURITIES  OFFERED  HEREBY HAVE NOT BEEN
REGISTERED  UNDER THE FLORIDA  SECURITIES AND INVESTOR  PROTECTION ACT ("FLORIDA
SECURITIES ACT") , AND THEY THEREFORE HAVE THE STATUS OF SECURITIES  ACQUIRED IN
AN EXEMPT  TRANSACTION UNDER SECTION 517.061 OF THE FLORIDA SECURITIES ACT. EACH
OFFEREE WHO IS A FLORIDA RESIDENT SHOULD BE AWARE THAT SECTION 517.061(11)(a)(5)
OF THE FLORIDA  SECURITIES ACT PROVIDES THAT WHEN SALES ARE MADE TO FIVE OR MORE
PERSONS IN FLORIDA, ANY SALE MADE IN FLORIDA IS VOIDABLE BY THE PURCHASER WITHIN
THREE DAYS AFTER THE FIRST TENDER OF  CONSIDERATION IS MADE BY SUCH PURCHASER TO
THE COMPANY, AN AGENT OF THE COMPANY OR AN ESCROW AGREEMENT OR WITHIN THREE DAYS
AFTER THE  AVAILABILITY  OF THAT PRIVILEGE IS  COMMUNICATED  TO SUCH  PURCHASER,
WHICH EVER OCCURS LATER.


                                       13





         THE  AVAILABILITY  OF THE  PRIVILEGE TO VOID SALES  PURSUANT TO SECTION
517.061(11)(a)(5) IS HEREBY COMMUNICATED TO EACH FLORIDA OFFEREE.


                                       14





         Manner in Which Title is to be Held.  (check one)

     ____ Individual Ownership
     ____ Community Property
     ____ Joint  Tenant with Right of  Survivorship  (both  parties must  sign) 
     ____ Partnership 
     ____ Tenants  in common
     ____ Corporation 
     ____ Trust
     ____ Other (please indicate)


INDIVIDUAL INVESTORS                          ENTITY INVESTORS


- ----------------------------------------        -------------------------------
Signature (Individual)                          Name of Entity, if any


                                                By:

                                                     *Signature

                                                Its
- -----------------------------------------          ----------------------------
Signature (all record holders should sign)            Title


- -----------------------------------------          ----------------------------
Name(s) Typed or Printed                               Name Typed or Printed

Address to Which Correspondence                 Address to Which Correspondence
Should be Directed                              Should be Directed

- -----------------------------------------       -------------------------------
- -----------------------------------------       -------------------------------
- -----------------------------------------       -------------------------------
City, State and Zip Code                        City, State and Zip Code

- -----------------------------------------       -------------------------------
Social Security Number                          Tax Identification

*        If  Preferred  Stock  is  being  subscribed  for  by  any  entity,  the
         Certificate of Signatory on the next page must also be completed.

The foregoing subscription is accepted and the Company hereby agrees to be bound
by its terms.

                                                H.E.R.C. PRODUCTS INCORPORATED


Dated:------------------, 1996                       By:

                                       15





                            CERTIFICATE OF SIGNATORY


(To be completed if Preferred Stock is being subscribed for by an entity)




         I, _______________________________, the

- --------------------------------
       (name of signatory)                           (title)

of ----------------------------------------------------------("Entity"), a
                       (name of entity)

 -----------------------------------------------.
                  (type of entity)

hereby  certify  that the  above  entity is duly  empowered  and  authorized  to
purchase the Preferred  Stock and that I am duly empowered and authorized by the
entity to execute the Subscription Agreement on its behalf.


         IN WITNESS  WHEREOF,  I have executed this Certificate this ____ day of
_________, 1996.



                                                -----------------------------
                                                        (Signature)


                                       16