Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

 In connection with the Quarterly Report of Olin Corporation (the “Company”) on Form 10-Q for the period ended March 31, 2010 as filed with the Securities and Exchange Commission (the “Report”), I, Joseph D. Rupp, Chairman, President and Chief Executive Officer and I, John E. Fischer, Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to our knowledge: (1) the Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and (2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its Staff upon request.

/s/ Joseph D. Rupp

Joseph D. Rupp

Chairman, President and Chief Executive Officer

Dated: April 27, 2010

/s/ John E. Fischer

John E. Fischer

Vice President and Chief Financial Officer

Dated: April 27, 2010