EXHIBIT 99.1
                         H.E.R.C. PRODUCTS INCORPORATED

                    CERTIFICATE OF DESIGNATIONS, PREFERENCES
                     AND OTHER RIGHTS AND QUALIFICATIONS OF
                             CLASS A PREFERRED STOCK
                       ----------------------------------

                         Pursuant to Section 151 of the
                        Delaware General Corporation Law
                       ----------------------------------


     H.E.R.C. PRODUCTS INCORPORATED,  a corporation organized and existing under
the Business Corporation Law of the State of Delaware ("Corporation") ,

         DOES HEREBY CERTIFY:

         FIRST:  That,  pursuant  to  authority  conferred  upon  the  Board  of
Directors  of  the   Corporation   ("Board")  by  the  amended   Certificate  of
Incorporation of said Corporation, and pursuant to the provisions of Section 151
of the Delaware General Corporation Law, said Board duly determined that 150,000
shares of Preferred Stock, $.01 par value per share,  shall be designated "Class
A Preferred Stock," and to that end the Board adopted a resolution providing for
the  designation,  preferences  and relative,  participating,  optional or other
rights,  and the  qualifications,  limitations and restrictions,  of the Class A
Preferred Stock, which resolution is as follows:

                  RESOLVED,  that the Board, pursuant to the authority vested in
         it by  the  provisions  of  the  Certificate  of  Incorporation  of the
         Corporation,  as amended, hereby creates a series of Preferred Stock of
         the corporation, par value $.01 per share, to be designated as "Class A
         Preferred Stock" and to consist of an aggregate of 150,000 shares.  The
         Class A Preferred Stock shall have such  designations,  preferences and
         relative,   participating,   optional   or   other   rights,   and  the
         qualifications, limitations and restrictions as follows:

     1.  Designations  and Amount.  150,000 shares of the Preferred Stock of the
Corporation,  par value $ .01 per share,  shall  constitute a class of Preferred
Stock designated as "Class A Preferred Stock" ("Class A Preferred  Stock").  The
Class A Preferred  Stock shall have a stated value of $10.00 per share  ("Stated
Value").

     2. Redemption  Rights.  The Class A Preferred Stock shall not be subject to
any right of redemption by the Corporation or by the holder thereof.

     3.  Dividends.  The holders of shares of Class A  Preferred  Stock shall be
entitled to receive  dividends  at the rate of 10% per annum of Stated Value (or
$1.00 per share) of the Class A Preferred Stock ("Preferred  Dividend") from the
date of issuance through the Conversion Date (as defined below),  payable solely
in shares of Common  Stock of the  Company  on the next  business  day after the
Conversion  Date,  such  number of shares of Common  Stock to be  calculated  in
accordance with paragraph 6(b) hereof.

     4. Rights on  Liquidation,  Dissolution or Winding Up, Etc. In the event of
any  voluntary  or  involuntary  liquidation,  dissolution  or winding up of the
Corporation,  as a result of which the assets of the  Corporation,  whether from
capital,  surplus or earnings,  shall be distributed to the  stockholders of the
Company, such assets shall be distributed  simultaneously to both the holders of
the Common Stock and the holders of the Class A Preferred Stock,



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calculated as if the Class A Preferred Stock (together with Preferred  Dividends
through the record date for such  distribution) was fully converted  immediately
prior to such distribution.

     5.  Voting  Rights.  The  holders of Class A  Preferred  Stock shall not be
entitled to vote on any matter, except as may be required by law.

     6. Conversion of Class A Preferred Stock.

                  (a) The  holders  of Class A  Preferred  Stock  shall have the
right,  at such  holders'  option,  at any time or from time to time, to convert
each share of Class A  Preferred  Stock,  together  with the  accrued  Preferred
Dividends  thereon  through the  Conversion  Date,  into the number of shares of
Common Stock calculated in accordance with paragraph 6(b) below.

                  (b) The  number of shares  of Common  Stock to be issued  upon
conversion of the Class A Preferred Stock and payment of the Preferred  Dividend
will be determined  by dividing the Stated Value of the Class A Preferred  Stock
being  converted,  plus the Preferred  Dividends  thereon through the Conversion
Date, by the greater of (i) 75% of the average Closing Bid Price (as hereinafter
defined)  of the  Common  Stock for the five  consecutive  trading  days  ending
immediately prior to the date of the Written Notice (as hereinafter  defined) or
(ii) $.10.  Notwithstanding  the foregoing,  if the Common Stock issuable by the
Corporation  upon  conversion of the Class A Preferred  Stock and payment of the
Preferred Dividend is not registered with the Securities and Exchange Commission
for resale by the holder thereof on or before the close of business on April 15,
1997, the aforementioned rate of 75% shall be reduced to 72.5%. The "Closing Bid
Price" shall mean the closing bid price for the  Corporation's  Common Stock, as
reported by The Nasdaq  Stock Market if the Common Stock is quoted on the Nasdaq
National Market or Nasdaq SmallCap Market, or the last sales price of the Common
Stock if the Common Stock is listed on a national securities exchange, whichever
is the principal trading market for the Common Stock. If the Common Stock is not
listed on a national securities exchange or quoted on the Nasdaq National Market
or Nasdaq SmallCap Market,  but is traded in the  over-the-counter  market,  the
Closing  Bid Price shall mean the  closing  bid price for the Common  Stock,  as
reported  by  the  OTC  Bulletin  Board  or  the  National   Quotation   Bureau,
Incorporated,  or similar publisher of such quotations. If the Closing Bid Price
cannot be determined  pursuant to the above, the Closing Bid Price shall be such
price as the Board of Directors of the Company shall determine in good faith.

                  (c)  Before  any holder of Class A  Preferred  Stock  shall be
entitled to convert the same into shares of Common Stock, such holder shall give
written notice ("Written Notice") to the Corporation at its principal  corporate
office,  of the election to convert the same and shall state therein the name or
names in which the certificate or certificates for shares of Common Stock are to
be issued.  The Written  Notice must be delivered via  telecopier  prior to 3:00
p.m. EST on any day and shall be deemed to be received by the  Corporation  upon
receipt by it or by its  general  counsel.  The  Corporation  shall,  as soon as
practicable,  but not later than one business day thereafter,  issue and deliver
to a location in New York City  designated  by such  holder,  a  certificate  or
certificates for the number of shares of Common Stock to which such holder shall
be entitled as aforesaid.  Simultaneously with such delivery,  such holder shall
surrender the certificate or  certificates  for the Class A Preferred Stock duly
endorsed  for  transfer.  Such  conversion  shall be  deemed  to have  been made
immediately  prior to the close of business on the date which the Written Notice
is received by the Corporation in accordance herewith  ("Conversion  Date"), and
the person or persons  entitled to receive the shares of Common  Stock  issuable
upon such  conversion  shall be treated for all purposes as the record holder or
holders of such shares of Common Stock as of such Conversion Date.



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                  (d) The  Corporation  shall not be required to issue fractions
of shares of Common  Stock upon  conversion  of the Class A  Preferred  Stock or
payment of the Preferred  Dividend.  If any fractions of a share would,  but for
this  Section,  be issuable upon any  conversion  of Class A Preferred  Stock or
payment of the Preferred  Stock,  in lieu of such  fractional  share the Company
shall round up or down to the nearest whole number of shares.

                  (e) The Corporation  shall reserve and shall at all times have
reserved out of its  authorized but unissued  shares of Common Stock  sufficient
shares of Common Stock to permit the conversion of the then  outstanding  shares
of the Class A Preferred Stock and payment of the Preferred Dividend pursuant to
this Section 6. All shares of Common  Stock which may be issued upon  conversion
of shares of the Class A Preferred  Stock and payment of the Preferred  Dividend
pursuant  to  this   Section  6  shall  be  validly   issued,   fully  paid  and
nonassessable.  In order that the  Corporation  may issue shares of Common Stock
upon  conversion  of shares of the Class A  Preferred  Stock and  payment of the
Preferred Dividend,  the Corporation will endeavor to comply with all applicable
Federal  and state  securities  laws and will  endeavor  to list such  shares of
Common Stock to be issued upon conversion on each  securities  exchange on which
Common Stock is listed and endeavor to maintain  such listing for such period of
time as either the Class A Preferred Stock or Common Stock underlying such Class
A Preferred Stock remains outstanding.

                  (f)  If  any  of  the   following   shall   occur:   (i)   any
reclassification  or change of outstanding  shares of Common Stock issuable upon
conversion of shares of the Class A Preferred  Stock (other than a change in par
value,  or from par value to no par value, or from no par value to par value, or
as a result of a  subdivision  or  combination),  or (ii) any  consolidation  or
merger  to which the  Corporation  is a party  other  than a merger in which the
Corporation  is the  continuing  corporation  and which  does not  result in any
reclassification  of, or change in,  outstanding shares of Common Stock, then in
addition  to all of the rights  granted to the  holders of the Class A Preferred
Stock as designated  herein,  the  Corporation,  or such successor or purchasing
corporation,  as the  case  may be,  shall,  as a  condition  precedent  to such
reclassification,  change, consolidation or merger ("Corporate Change"), provide
in its certificate of incorporation or other charter document that each share of
the Class A  Preferred  Stock shall be  convertible  into the kind and amount of
shares of capital  stock and other  securities  and  property  (including  cash)
receivable  upon such  Corporate  Change by a holder of the  number of shares of
Common Stock  deliverable upon conversion of such share of the Class A Preferred
Stock and the payment of the Preferred Dividend thereon immediately prior to the
Corporate  Change.  If, in the case of any such Corporate  Change,  the stock or
other securities and property (including cash) receivable  thereupon by a holder
of  Common  Stock  includes  shares of  capital  stock or other  securities  and
property of a corporation  other than the corporation  which is the successor of
the Corporation in such Corporate Change,  then the certificate of incorporation
or  other  charter  document  of  such  other  corporation  shall  contain  such
additional  provisions  to protect the interests of the holders of shares of the
Class A Preferred  Stock as the Board of  Directors  shall  reasonably  consider
necessary by reason of the  foregoing.  The provision of this Section 6(f) shall
similarly  apply to successive  reclassifications,  changes,  consolidations  or
mergers.

                  (g) If any Class A Preferred  Stock is issued and  outstanding
on November __, 1999,  such Class A Preferred  Stock and the Preferred  Dividend
thereon  shall,  without  any  action  on the  part of the  holder  thereof,  be
automatically converted into Common Stock on that date on the above terms.




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                  (h) In the event any shares of Class A  Preferred  Stock shall
be converted pursuant to Section 6 hereof, the shares of Class A Preferred Stock
so converted shall be canceled.

                  (i) The Corporation  will not, by amendment of its Certificate
of   Incorporation   or  through   any   reorganization,   transfer  of  assets,
consolidation,  merger,  dissolution,  issue or sale of  securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed hereunder by the Corporation,  but will at
all times in good faith assist in the carrying out of all the provisions of this
Section  6 and in the  taking  of  all  such  action  as  may  be  necessary  or
appropriate  in order to protect  the  conversion  rights of the  holders of the
Class A Preferred Stock against impairment.

         Such resolution was signed by the President and Assistant  Secretary of
the Corporation.

         IN WITNESS  WHEREOF,  we have executed this  Certificate of Designation
this 21st day of November, 1996.

                                               H.E.R.C. PRODUCTS INCORPORATED


                                      By:      /s/ Gary S. Glatter
                                         --------------------------------------
                                          Gary S. Glatter, President


                                      By:   /s/ Kristi A. Cordray
                                         --------------------------------------
                                         Kristi A. Cordray, Assistant Secretary



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                         H.E.R.C. PRODUCTS INCORPORATED

                    CERTIFICATE OF DESIGNATIONS, PREFERENCES
                     AND OTHER RIGHTS AND QUALIFICATIONS OF
                             CLASS A PREFERRED STOCK
                       ----------------------------------

                         Pursuant to Section 151 of the
                        Delaware General Corporation Law
                       ----------------------------------



     H.E.R.C. PRODUCTS INCORPORATED,  a corporation organized and existing under
the General Corporation Law of the State of Delaware ("Corporation"),

         DOES HEREBY CERTIFY:

         FIRST:  That,  pursuant  to  authority  conferred  upon  the  Board  of
Directors  of  the   Corporation   ("Board")  by  the  amended   Certificate  of
Incorporation of said Corporation, and pursuant to the provisions of Section 151
of the Delaware  General  Corporation  Law, said Board duly  determined that the
number  of shares  of  Preferred  Stock,  $.01 par  value  per  share,  shall be
increased  from  150,000  shares to  185,000  shares,  and to that end the Board
adopted a resolution, which resolution is as follows:

                  RESOLVED,  that the Board, pursuant to the authority vested in
         it by  the  provisions  of  the  Certificate  of  Incorporation  of the
         Corporation, as amended, hereby increases the number of shares of Class
         A  Preferred  Stock of the  Corporation,  par  value  $.01  per  share,
         designated  as Class A Preferred  Stock from 150,000  shares to 185,000
         shares.

         Such resolution was signed by the President and Assistant  Secretary of
the Corporation.

         IN WITNESS  WHEREOF,  we have executed this  Certificate of Designation
this 6th day of December, 1996.

                                     H.E.R.C. PRODUCTS INCORPORATED


                                     By:      /s/ Gary S. Glatter
                                        ---------------------------------------
                                             Gary S. Glatter, President


                                     By:      /s/ Kristi A. Cordray
                                        ---------------------------------------
                                        Kristi A. Cordray, Assistant Secretary



                                        5




                         H.E.R.C. PRODUCTS INCORPORATED

                    CERTIFICATE OF DESIGNATIONS, PREFERENCES
                     AND OTHER RIGHTS AND QUALIFICATIONS OF
                             CLASS A PREFERRED STOCK
                       ----------------------------------

                         Pursuant to Section 151 of the
                        Delaware General Corporation Law
                       ----------------------------------



     H.E.R.C. PRODUCTS INCORPORATED,  a corporation organized and existing under
the General Corporation Law of the State of Delaware ("Corporation"),

         DOES HEREBY CERTIFY:

         FIRST:  That,  pursuant  to  authority  conferred  upon  the  Board  of
Directors  of  the   Corporation   ("Board")  by  the  amended   Certificate  of
Incorporation of said Corporation, and pursuant to the provisions of Section 151
of the Delaware  General  Corporation  Law, said Board duly  determined that the
mandatory  conversion  date of the Class A Preferred  Stock,  $.01 par value per
share, specified in Section 6(g) of the Certificate of Designations, Preferences
and Other  Rights and  Qualifications  of the Class A  Preferred  Stock shall be
December  17,  1999,  and to that end the  Board  adopted  a  resolution,  which
resolution is as follows:

                  RESOLVED,  that the Board, pursuant to the authority vested in
         it by  the  provisions  of  the  Certificate  of  Incorporation  of the
         Corporation,   as  amended,   hereby   designates  that  the  mandatory
         conversion  date of the Class A  Preferred  Stock,  par value  $.01 per
         share,  specified in Section 6(g) of the  Certificate of  Designations,
         Preferences  and  Other  Rights  and  Qualifications  of  the  Class  A
         Preferred  Stock shall be the third  anniversary  of the Final  Closing
         Date.

         Such resolution was signed by the President and Assistant  Secretary of
the Corporation.

         IN WITNESS  WHEREOF,  we have executed this  Certificate of Designation
this 17th day of December, 1996.

                                               H.E.R.C. PRODUCTS INCORPORATED


                                    By:      /s/ Gary S. Glatter
                                       ----------------------------------------
                                            Gary S. Glatter, President


                                    By:      /s/ Kristi A. Cordray
                                       ----------------------------------------
                                        Kristi A. Cordray, Assistant Secretary



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