EXHIBIT 32.1
CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. §1350)
I, John R. Gibson, the Chief Executive Officer of American Pacific Corporation (the “Company”), certify that to the best of my knowledge:
(i) the Quarterly Report of the Company on Form 10-Q dated August 3, 2004 for the period ended June 30, 2004 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(ii) the information contained in the said Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.
| /s/ JOHN R. GIBSON |
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| John R. Gibson |
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| August 3, 2004 |
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