<SUBMISSION>
<ACCESSION-NUMBER>0001206774-04-000399
<TYPE>8-K
<PUBLIC-DOCUMENT-COUNT>2
<PERIOD>20040426
<ITEMS>5
<ITEMS>7
<FILING-DATE>20040427
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>AMERICAN PACIFIC CORP
<CIK>0000350832
<ASSIGNED-SIC>2810
<IRS-NUMBER>596490478
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0930
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>8-K
<ACT>34
<FILE-NUMBER>001-08137
<FILM-NUMBER>04756488
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>3770 HOWARD HUGHES PKWY STE 300
<CITY>LAS VEGAS
<STATE>NV
<ZIP>89109
<PHONE>7027352200
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>3770 HOWARD HUGHES PKWY STE 300
<STREET2>3770 HOWARD HUGHES PKWY STE 300
<CITY>LAS VEGAS
<STATE>NV
<ZIP>89109
</MAIL-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>ap907099.htm
<DESCRIPTION>FORM 8K
<TEXT>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">OMB Approval</font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">OMB   Number:&nbsp;&nbsp;&nbsp;3235-0060</font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">Expires:&nbsp;&nbsp;&nbsp;October   31,2005</font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">Estimated average<br>   burden hours per<br>   response 15.00</font></p>  </td>
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<p  align="center">
<font size="5" face="Times New Roman"><b>UNITED STATES<br> SECURITIES AND EXCHANGE COMMISSION<br> </b></font>
<font size="3"><b>Washington, DC&#160; 20549</b></font></p>
<p  align="center">
<font size="5" face="Times New Roman"><b>FORM 8-K</b></font></p>
<p  align="center">
<font size="3" face="Times New Roman"><b>CURRENT REPORT<br> Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934</b></font></p>
<p  align="center">
<font size="2" face="Times New Roman"><b>Date of Report (Date of earliest event reported):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;April 26, 2004</b></font></p>
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  <p  align="center"><font size="6" face="Times New Roman"><b>American   Pacific Corporation</b></font></p>  </td>
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<font size="1" face="Times New Roman"><b>(Exact   Name of Registrant as Specified in Charter)</b></font></p>  </td>
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<BR>

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<font size="2" face="Times New Roman"><b>Delaware</b></font></p>  </td>
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<font size="2" face="Times New Roman"><b>1-8137</b></font></p>  </td>
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<font size="2" face="Times New Roman"><b>59-6490478</b></font></p>  </td>
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<font size="1" face="Times New Roman"><b>(State or   Other Jurisdiction<br>   of Incorporation)</b></font></p>  </td>
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<font size="1" face="Times New Roman"><b>(Commission<br>   File Number)</b></font></p>  </td>
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<font size="1" face="Times New Roman"><b>(IRS   Employer<br>   Identification No.)</b></font></p>  </td>
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  <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <p  align="center"><font size="2" face="Times New Roman"><b>3770 Howard Hughes Parkway, Suite 300, Las Vegas, Nevada</b></font></p>  </td>
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<font size="2" face="Times New Roman"><b>89109</b></font></p>  </td>
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<font size="1" face="Times New Roman"><b>(Address   of Principal Executive Offices)</b></font></p>  </td>
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<font size="1" face="Times New Roman"><b>(Zip Code)</b></font></p>  </td>
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<p>
<font size="2" face="Times New Roman"><b>Registrant&#146;s telephone number, including area code:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(702) 735-2200</b></font></p>
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<font size="2" face="Times New Roman"><b>N/A</b></font></p>  </td>
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<font size="1" face="Times New Roman"><b>(Former   Name or Former Address, if Changed Since Last Report.)</b></font></p>  </td>
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<p  align="center">
<font size="2" face="Times New Roman">Page 1</font></p>

<div style="page-break-before:always"></div>
<PAGE>
<br>

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<font size="2" face="Times New Roman">Item 5.</font></p>  </td>
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<font size="2" face="Times New Roman"><u>Other Events   and Regulation FD Disclosure</u></font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">On April 26, 2004,   American Pacific Corporation announced via press release that they had agreed   to acquire the in-space propulsion (ISP Business) from Aerojet-General   Corporation.&#160; This agreement includes   customary closing conditions and requires the receipt of Federal Trade   Commission approval of the transaction.&#160;   The full text of the press release is attached hereto as   Exhibit&nbsp;99.1 and incorporated herein by reference.</font></p>  </td>
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<font size="2" face="Times New Roman">Item 7.</font></p>  </td>
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<font size="2" face="Times New Roman"><u>Financial   Statements and Exhibits</u></font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Exhibits</font></p>  </td>
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  <p style="margin-left:1em; text-indent:-1em"><font size="2" face="Times New Roman"><b>Exhibit No.</b></font></p>  </td>
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  <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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<font size="2" face="Times New Roman"><b>Description</b></font></p>  </td>
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  <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">99.1</font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">Press   Release dated April 26, 2004 regarding agreement to acquire Aerojet-General&#146;s   in-space propulsion business.</font></p>  </td>
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<font size="2" face="Times New Roman"><b><u>SIGNATURE</u></b></font></p>
<p>
<font size="2" face="Times New Roman">Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</font></p>



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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman"><b>A<small>MERICAN</small> P<small>ACIFIC</small>   C<small>ORPORATION</small></b></font></p>  </td>
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  <p><font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="2" face="Times New Roman">Dated: April   27, 2004</font></p>  </td>
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<font size="2" face="Times New Roman">By:</font></p>  </td>
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<font size="2" face="Times New Roman">/s/&nbsp;&nbsp;&nbsp;S<small>ETH</small> L. V<small>AN</small>   V<small>OORHEES</small></font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <hr size="1" width="100%" noshade color=black>

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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="1" face="Times New Roman"><b>Seth L.   Van Voorhees</b></font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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<font size="1" face="Times New Roman"><b>Chief Financial   Officer</b></font></p>  </td>
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<p  align="center">
<font size="2" face="Times New Roman">Page 2</font></p>

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<DOCUMENT>
<TYPE>EX-99
<SEQUENCE>2
<FILENAME>ap907099ex991.htm
<DESCRIPTION>EXHIBIT 991
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<p  align="center">
<font size="2" face="Times New Roman"><b>EXHIBIT 99.1</b></font></p>
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<font size="2" face="Times New Roman"><b><i>AMERICAN PACIFIC CORPORATION</i></b></font></p>  </td>
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  <p><font size="2" face="Times New Roman">Contact:&#160; Seth Van Voorhees &#150; (702) 735-2200 ext.   166</font></p>  </td>
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<font size="2" face="Times New Roman">E-mail:&#160; InvestorRelations@apfc.com</font></p>  </td>
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<font size="2" face="Times New Roman">Website:&#160; www. apfc.com</font></p>  </td>
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<p  align="center">
<font size="3" face="Times New Roman"><b>AMERICAN PACIFIC SIGNS AGREEMENT TO ACQUIRE <br> AEROJET-GENERAL&#146;S IN-SPACE PROPULSION BUSINESS</b></font></p>
<p>
<font size="2" face="Times New Roman"><b>Las Vegas, NV, April 26, 2004</b> &#150; American Pacific Corporation (NASDAQ: APFC) announced today that it has agreed to acquire the in-space propulsion business (ISP Business) from Aerojet-General Corporation (Aerojet) for approximately $3.5 million in cash and the assumption of certain liabilities.&#160; The agreement includes customary closing conditions and requires the receipt of Federal Trade Commission approval of the transaction.&#160; The transaction is expected to close in the second half of 2004.</font></p>
<p>
<font size="2" face="Times New Roman">In October 2003, Aerojet acquired Atlantic Research Corporation&#146;s propulsion business, including the ISP Business.&#160; As a condition to the Federal Trade Commission&#146;s approval of that acquisition, Aerojet is required to divest the ISP Business.</font></p>
<p>
<font size="2" face="Times New Roman">The ISP business, a leading supplier of commercial and military propulsion products, is the world&#146;s largest producer of bipropellant thrusters.&#160; The ISP business has operations in Niagara Falls, New York, and in Westcott, England.&#160; In 2003, the ISP business had sales of approximately $13 million.</font></p>
<p>
<font size="2" face="Times New Roman">&#147;One of our strategies is to invest in and grow our aerospace and defense business.&#160; This transaction will allow American Pacific to offer a broad array of products and service to aerospace and defense customers.&#160; We believe that by combining our expertise in energetic materials with ISP management&#146;s expertise in the design, development and testing of thrusters, we will be able to accelerate the development of new products for customers in this industry&#148; said John R. Gibson, CEO of American Pacific.</font></p>

<p><font size="2" face="Times New Roman">American Pacific is a specialty chemical company that produces products used primarily in space flight and defense systems, automotive airbag safety systems, fire extinguishment systems and explosives.&#160; </font></p>
<p><font size="2" face="Times New Roman">Aerojet, a GenCorp Inc. company (NYSE: GY) is a world-recognized aerospace and defense leader principally serving the missile and space propulsion, and defense and armaments markets.</font></p>
<p><font size="2" face="Times New Roman"><b><i>Risk Factors/Forward Looking Statements</i></b></font></p>
<p><font size="2" face="Times New Roman">Except for the historical information contained herein, this News Release may contain Forward Looking Statements that are subject to risks and uncertainties, including the Company&#146;s ability to profitably integrate, manage and operate new businesses and/or investments competitively, as well as other risks detailed from time to time in the Company&#146;s SEC reports, including the most recent Form 10-K and 10-Q Reports.</font></p>
<p  align="center"><font size="2" face="Times New Roman"><i># # #</i></font></p>
<p  align="center"><font size="2" face="Times New Roman">3770 HOWARD HUGHES PARKWAY &#149; SUITE 300 &#149; LAS VEGAS, NV&#160; 89109<br> PHONE (702) 735-2200 &#149; FAX (702) 735-4876</font></p>
<p  align="center"><font size="2" face="Times New Roman">Exhibit 99.1 &#150; Page 1</font></p>

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</SUBMISSION>
