SECOND AMENDMENT
                                    TO
                 LETTER OF CREDIT REIMBURSEMENT AGREEMENT
                                  BETWEEN
                             PYRON CORPORATION
                                    AND
                               CHEMICAL BANK



     THIS AMENDMENT to the Letter of Credit Reimbursement
Agreement dated as of November 1, 1989, dated March 15, 1995, is
entered into between PYRON CORPORATION, a corporation organized
and existing under the laws of the State of New York (the
"Company"), and CHEMICAL BANK, a banking corporation organized
and existing under the laws of the State of New York (the
"Bank").

                                 RECITALS

     The Company and the Bank entered into a Letter of Credit
Reimbursement Agreement dated as of November 1, 1989, as amended
by the First Amendment to Letter of Credit Reimbursement
Agreement dated as of March 19, 1990 (the "Reimbursement
Agreement"), and now desire to amend certain provisions thereof
on the terms and conditions hereinafter set forth.

                                 AGREEMENT

     In consideration of the premises, the mutual covenants
contained herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby mutually
acknowledged, the Company and the Bank agree as follows:

     1.   The definition of Corporate Guaranty in Section 1.01 is
hereby amended to read as follows:

               "Corporate Guaranty" shall mean the Amended and
          Restated Corporate Guaranty dated as of March 15, 1995,
          as may be amended from time to time, from the Corporate
          Guarantor to the Bank."

     2.   The definiton of "Loan Agreement" is hereby added to
Section 1.01 to read as follows:

               "Loan Agreement" shall mean the Loan and Security
          Agreement made as of the 15th day of March, 1995, by
          and among Zemex Corporation, a Delaware corporation,
          The Feldspar Corporation, a North Carolina corporation,
          Pyron Corporation, a New York corporation, Pyron Metal
          Powders, Inc., a Delaware corporation, Suzorite Mica
          Products, Inc., an Ontario corporation, Suzorite
          Mineral Products, Inc., a Delaware corporation,
          NationsBank of Tennessee, N.A. and Chemical Bank."

     3.   Section 2.03(a) of the Reimbursement Agreement with
respect to fees shall be amended to read as follows:

               Section 2.03.  Fees.

               . . .

               (a)  A letter of credit fee, payable quarterly in
          arrears on the last Business Day of each calendar
          quarter commencing with a payment on the first such
          date following the Date of Issuance for the period of
          time from the Date of Issuance to the Expiration Date
          at a rate equal to 1.00% per annum in excess of the
          Applicable Letter of Credit Fee Margin on the Letter of
          Credit Amount; provided, however, that within  ten (10)
          days after the end of each calendar quarter the actual
          fee due with respect to such calendar quarter shall be
          calculated by the Bank on the average daily amount of
          the Letter of Credit Amount during such calendar
          quarter  taking into account the amount of any
          reduction and reinstatement of the Principal Component
          or Interest Component, as defined in the Letter of
          Credit  and (i) in the event that any overpayment of
          the Letter of Credit fee has been made with respect to
          such calendar quarter, then the excess amount paid
          shall be credited against the Letter of Credit fee
          payable in respect of the next succeeding calendar
          quarter (unless the quarter in respect of which the fee
          was paid was the last calendar quarter with respect to
          which any such fee is payable hereunder, in which case
          the Bank shall remit the excess to the Company promptly
          following calculation of the actual fee), and (ii) in
          the event that an underpayment of the Letter of Credit
          fee has been made with respect to such calendar
          quarter, then the difference between the amount paid
          and the amount owed shall be paid together with the
          Letter of Credit fees payable in respect of the next
          succeeding calendar quarter (unless the quarter in
          respect of which the fee was paid was the last calendar
          quarter with respect to which any such fee is payable
          hereunder, in which case the Company shall remit the
          deficiency to the Bank promptly following calculation
          of the actual fee).  "Applicable Letter of Credit Fee
          Margin" means one percent (1.0%) per annum; provided
          however, that during any fiscal quarter of the Borrower
          where the Borrower shall have satisfied the Funded Debt
          to Capital ratio test indicated in the table below,
          then the Applicable Letter of Credit Fee Margin for the
          Effective Period (as defined below) shall be the
          percentage rate per annum set forth opposite the
          appropriate test in the table below:

          Funded Debt to Capital             Applicable Letter of
                                             Credit Fee Margin

          Equal to or Greater than 35%                      1.00%
          per annum

          Equal to or Greater than 25% and Less Than 35%     .05%
          per annum

          Less than 25%                                      .00%
          per annum

          The Funded Debt to Capital ratio shall be computed as
          set forth in Section 3.16(b) of the Corporate Guaranty,
          and the Applicable Letter of Credit Rate Margin shall
          be confirmed by the Bank on the basis of quarter-annual
          financial statements of the Corporate Guarantor
          delivered to the Bank pursuant to Section 3.01(a) of
          the Corporate Guaranty and year end financial
          statements delivered pursuant to Section 3.01(b) of the
          Corporate Guaranty.  The "Effective Period" shall be
          the period commencing on the first business day of the
          first month following delivery to the Bank of the
          financial statements of the Corporate Guarantor
          pursuant to Section 3.01(a) and 3.01(b) of the
          Corporate Guaranty, which financial statements indicate
          that the applicable test set forth above has been
          satisfied for the preceding fiscal quarter, and ending
          on the date that is three months after such
          commencement date except for the third and fourth
          fiscal quarters of each year, where the ending date
          shall be four months after the commencement date and
          two months after the commencement date, respectively.
          At the end of any Effective Period, the Applicable
          Letter of Credit Fee Margin shall automatically become
          one percent (1%) per annum unless at or prior to such
          time the next Effective Period shall have commenced.

     4.   Sections 7.03, 7.04, 7.07, 7.09, 7.11, 7.14, 8.02,
8.03, 8.04, 8.05, 8.06, 8.07, 8.08 and 8.09 of the Reimbursement
Agreement are hereby deleted.

     5.   Section 7.05 is amended to read as follows:

               Section 7.05   Notice of Lawsuits, Material
          Adverse Changes, Etc.  Promptly inform the Bank of each
          of the following promptly after the Company knows or
          has reason to know:

               (a) of the commencement of which it has knowledge,
          of any action, suit, claim, counterclaim or proceeding
          against or any audit or investigation by any
          governmental or regulatory body of it which questions
          the validity of this Reimbursement Agreement, any
          Related Document or any other agreement or instrument
          required hereunder, or any action taken or to be taken
          pursuant to any of the foregoing; or

               (b)  of any representation or warranty in this
          Reimbursement Agreement which was or has proven to be
          incorrect in any material respect on or as of the date
          made or deemed made.

     6.   Section 9.01(l) is hereby added to read as follows:

               Section 9.01  Events of Default.

               .  .  .

               (l)  The occurance and continuance of an Event of
          Default under the Loan Agreement:

     7.   The notification addresses set forth in Section 10.02
are hereby amended to read as follows:

          To the Company:

               Pyron Corporation
               5950 Packard Road
               Niagara Falls, New York  14094
               Attn:  President

          Copy to the Corporate Guarantor:

               Zemex Corporation
               Canada Trust Tower
               BCE Place, 161 Bay Street
               Suite 3750
               Toronto, Ontario M5J 251
               Attn:  Chief Financial Officer
               Facsimile:  (416) 365-8094

          To the Bank:

               Chemical Bank
               2300 Main Place Tower
               Buffalo, New York  14202
               Attention:  Account Officer for Pyron
               Corporation
               Facsimile:  (716) 843-4939

     8.   The Company hereby represents and warrants to the Bank
as follows:

          (a)  Corporate Existence.  The Company and its Guaranty
     Subsidiaries are duly organized, validly existing and in
     good standing under the laws of the respective jurisdictions
     of their incorporation, have the corporate power to own
     their assets and to transact the businesses in which they
     are currently engaged, and are duly qualified as foreign
     corporations and in good standing under the laws of each
     jurisdiction where  their ownership or lease of property or
     the conduct of  their business requires such qualification
     except in jurisdictions where the failure to become so
     qualified, in any case or in the aggregate, would not have a
     material adverse effect on the business, operations, assets
     or financial condition of the Company and its Guaranty
     Subsidiaries taken as a whole.

          (b)  Corporate Power; Authorization; Enforceable
     Obligations.  The Company has the corporate power, authority
     and legal right to make, deliver and perform this
     Reimbursement Agreement Amendment has taken all necessary
     corporate action to authorize the borrowings on the terms
     and conditions of this Reimbursement Agreement as heretofore
     and herein and to authorize its execution, delivery and
     performance of this Reimbursement Agreement Amendment.  No
     consent of any Person (including, without limitation,
     stockholders or creditors of the Company), and no consent,
     license, permit, approval or authorization of, exemption by,
     notice or report to, or registration, filing or declaration
     with, any governmental authority which has not been obtained
     is required on the part of the Company in connection with
     its borrowings hereunder or with the execution, delivery or
     performance by the Company, or the validity or
     enforceability against the Company of this Reimbursement
     Agreement Amendment; provided, however, that no
     representation or warranty is made as to any state
     securities or "Blue Sky" laws.  This Reimbursement Agreement
     Amendment has been executed and delivered by a duly
     authorized officer of the Company and constitutes the legal,
     valid and binding obligations of the Company.

          c.   No Legal Bar to Loans.  The execution, delivery
     and performance of this Reimbursement Agreement Amendment
     and will not constitute a violation by the Company of any
     provision of any existing law or regulation, or of any
     order, judgment, award or decree of any court, arbitrator or
     governmental authority, or of the Certificate of
     Incorporation or By-Laws of the Company or any of its
     Subsidiaries, or of any securities issued by the Company or
     any of its Subsidiaries, or of any mortgage, indenture or
     lease, or any material contract or other material agreement,
     instrument or undertaking to which the Company or any of its
     Subsidiaries is a party or by which the Company or any of
     its Subsidiaries or any of their respective assets may be
     bound, and will not result in, or require, the creation or
     imposition of any Lien on any of  the property, assets or
     revenues of the Company pursuant to the provisions of any
     such mortgage, indenture, lease, contract or other
     agreement, instrument or undertaking except as contemplated
     hereby or by any of the Company Related Documents; provided,
     however, that no representation or warranty is made as to
     any state securities or "Blue Sky" laws.

          d.   No Default.  No Event of Default specified in
     Article IX of the Reimbursement Agreement, nor any event
     which, upon notice or lapse of time or both, would
     constitute such an Event of Default, has occurred and is
     continuing.

     9.   Except as specifically amended by the terms hereof, the
Reimbursement Agreement shall remain in full force and effect in
accordance with its terms.

     IN WITNESS WHEREOF, the parties hereto have caused this
instrument to be duly executed on the date first above written.


ATTEST:                       PYRON CORPORATION



By:/s/ Patricia Mora          By:/s/ Allen J. Pamiere
   Assistant Secretary           Vice President


[SEAL]

                              CHEMICAL BANK


                              By:
                                 Daniel J. Zimmer,
                                 Vice President