Exhibit 4(j) November 12, 1997 The Chase Manhattan Bank Global Chemicals and Related Industries 270 Park Avenue - 38th Floor New York, NY 10017-2070 Attention: Robert T. Sacks, Managing Director Citibank, N.A. 399 Park Avenue, 4th Floor, Zone 16 New York, NY 10043 Attention: Joronne J. Jeter, Vice President Credit Suisse First Boston New York Branch 11 Madison Avenue - 20th Floor New York, NY 10010 Attention: Lynn Allegaert Morgan Guaranty Trust Company of New York 60 Wall Street New York, NY 10260-0060 Attention: Martin R. Atkin, Managing Director 2 NationsBank, N.A. Corporate Finance Group 767 Fifth Avenue New York, NY 10153-0083 Attention: George F. Van, Senior Vice President Wachovia Bank, N.A. 152 West 57th Street, 37th Floor New York, NY 10019 Attention: John Paul Mathis, Vice President Re: Fourth Amendment ---------------- Dear Sirs: We refer to the Credit Agreement, dated as of September 30, 1993, as amended through October 26, 1996 ("Credit Agreement"), among Olin Corporation ("Borrower"), The Chase Manhattan Bank, Citibank, N.A., Credit Suisse First Boston, Morgan Guaranty Trust Company of New York, NationsBank, N.A. and Wachovia Bank, N.A. Capitalized terms utilized but not defined herein have the meanings specified in the Credit Agreement. The following sets forth the agreement of the undersigned to amend the Credit Agreement: 1. Section 1.01 is amended by changing the definitions of "Applicable Margin", "Facility Fee Rate", "Reference Banks" and "Termination Date" therein to read respectively as follows: "Applicable Margin" means, as determined on the date the Adjusted CD Rate or Eurodollar Rate, as the case may be, is determined, when the Ratings are as set forth below, the rate per annum set forth below opposite such Ratings: 3 Applicable Applicable Ratings Eurodollar C/D Rate Moody's S&P Margin Margin ------- --- ----------- ----------- If the Borrower has a Moody's or S&P rating which is greater than or equal to any one of: A3 or A- .12% .245% If the Borrower has a Moody's or S&P rating which is equal to any one of: Baal or BBB+ .16% .285% Baa2 or BBB .20% .325% Baa3 or BBB- .25% .375% Any other Rating lower than those set forth above .32% .445% "Facility Fee Rate" means with respect to each day when the Ratings are as set forth below, the rate per annum set forth below opposite such Ratings: Ratings Moody's S&P Facility Fee Rate ------- --- ----------------- If the Borrower has a Moody's or S&P rating which is greater than or equal to any one of: A3 or A- .08% If the Borrower has a Moody's or S&P rating which is equal to any one of: Baa1 or BBB+ .09% Baa2 or BBB .10% Baa3 or BBB- .12% Any other Rating lower than those set forth above .18% 4 "Reference Banks" means The Chase Manhattan Bank and Citibank, N.A. "Termination Date" means (i) October 15, 2002 or (ii) any date to which the Termination Date shall have been extended pursuant to Section 2.04(b); provided in each case of (i) and (ii), the earlier date on which the termination in whole of the Commitments occurs pursuant to Section 2.04(a) or 6.01. 2. The text contained in Section 5.02(d) is hereby deleted and replaced with "(d) [Intentionally Left Blank]". 3. The definition of "Pollution Control Financing" contained in Section 1.01 is hereby deleted. The following definition is inserted in appropriate alphabetical order into Section 1.01: "Tax-Exempt Financing" means a transaction with a governmental unit or -------------------- instrumentality which involves (i) the issuance by such governmental unit or instrumentality to Persons other than the Borrower or a Subsidiary of bonds or other obligations on which the interest is exempt from Federal income taxes under Section 103 of the Internal Revenue Code and the proceeds of which are applied to finance or refinance the cost of acquisition of equipment or facilities of the Borrower or any of its subsidiaries, and (ii) participation in the transaction by the Borrower or a Subsidiary in any manner permitted by this Agreement. All other references in the Credit Agreement to "Pollution Control Financing" are hereby deleted and replaced with the words "Tax-Exempt Financing". 4. Section 5.02(c) of the Agreement shall be amended to read in its entirety as follows: (c) Mergers, Etc. (i) Merge or consolidate with or into any other Person (other than a Subsidiary) or (ii) convey, transfer, lease or otherwise dispose of, or permit a Subsidiary to convey, transfer, lease, or otherwise dispose of, (whether in one transaction or in a series of related transactions) all or substantially all of the property or assets of the Borrower and its Subsidiaries taken as a whole (whether now owned or hereafter acquired), directly or indirectly, to any Person, including through a merger or consolidation of a Subsidiary with an unaffiliated party, unless, in each case of (i) or (ii), (A) after giving effect to such proposed transaction, no Event of Default or event which with the giving of notice or lapse of time, or both, would constitute an Event of Default would exist, (B) the surviving or acquiring entity is a corporation organized under the laws of one of the United States and (C) the surviving or acquiring corporation if other than the Borrower, expressly assumes the performance of all the obligations of the Borrower under this Agreement and the Notes. 5. Clause (ii) of Section 5.02(b) is hereby amended by replacing the reference therein to "Section 5.02(b)" with the words "Section 5.02(a)." 5 6. Section 7.02(e) is hereby amended by replacing the reference therein to "Federal Revenue Bank" with the words "Federal Reserve Bank." 7. Except as amended or waived hereby, the provisions of the Credit Agreement remain in full force and effect. 8. This fourth amendment shall become effective as of November 12, 1997 provided it is approved by the Banks as required by Section 8.01 of the Credit Agreement at any time. 9. This fourth amendment may be executed in any number of counterparts and each counterpart shall be deemed to be an original document. The Borrower confirms that the representations and warranties contained in Section 4.01 of the Credit Agreement are correct as though made on and as of the date hereof (for this purpose the term "Agreement" as used in Section 4.01 shall mean the Credit Agreement as amended hereby). Kindly confirm by your signature below your agreement to the foregoing. BORROWER -------- OLIN CORPORATION By /s/Janet M. Pierpont ------------------------------------ Title: Vice President and Treasurer Commitment BANKS - ---------- ----- $ 50,000,000 CITIBANK, N.A. By: /s/James N. Simpson ---------------------------------- Name: James N. Simpson Title: Attorney-in-Fact 6 $ 20,000,000 CREDIT SUISSE FIRST BOSTON By: /s/Lynn Allegaert ---------------------------------- Name: Lynn Allegaert Title: Vice President By: /s/Daniel R. Wenger ---------------------------------- Name: Daniel R. Wenger Title: Associate $ 40,000,000 MORGAN GUARANTY TRUST COMPANY OF NEW YORK By: /s/Penelope J. B. Cox ---------------------------------- Name: Penelope J. B. Cox Title: Vice President $ 30,000,000 NATIONSBANK, N.A. By: /s/Eileen C. Higgins ----------------------------------- Name: Eileen C. Higgins Title: Vice President $ 70,000,000 THE CHASE MANHATTAN BANK By: /s/Robert T. Sacks ---------------------------------- Name: Robert T. Sacks Title: Managing Director $ 40,000,000 WACHOVIA BANK, N.A. By: /s/James McCreary ---------------------------------- Name: James F. McCreary Title: Senior Vice President $250,000,000 Total of the Commitments 7 Schedule 1 Eurodollar Domestic Lending Lending Name of Bank Office CD Lending Office Office - ------------ ---------------- ----------------- ---------- Wachovia Bank, N.A. 191 Peachtree St. NE Same Same 28th Floor Atlanta, GA 30303 All Notices and A/B Advance Payments ------------------------------------ Wachovia Bank, N.A. 152 West 57th Street 37th Floor New York, NY 10019 Attention: John Paul Mathis Wire Instructions (A/B Advance Payments) ---------------------------------------- Wachovia Bank, N.A. 191 Peachtree Street, NE Atlanta, GA 30303 ABA# 061000010 FW Money Transfer Suspense Account No. 18171498 Attention: Complex Unit Re: Olin