EXHIBIT 99.1

NOTICE OF PARTIAL REDEMPTION

to the Holders of

AMERICAN PACIFIC CORPORATION

9% SENIOR NOTES DUE 2015

CUSIP NUMBER: 028740 AF5

On behalf of American Pacific Corporation, notice is hereby given that pursuant to paragraph 5(a) of the Notes and Section 3.7 of the Indenture dated as of February 6, 2007 between American Pacific Corporation (the “Company”) and Wells Fargo Bank, National Association (the “Trustee”), the Company has elected to redeem $40,000,000 of its outstanding 9% Senior Notes due 2015 on September 8, 2012 (the “Redemption Date”) at a redemption price of 102.250% plus accrued and unpaid interest to the Redemption Date (the “Redemption Price”). Terms used in this Notice of Partial Redemption and not otherwise defined shall have the meanings assigned to them in the Indenture.

The Note to be redeemed is Note No. 1 payable to Cede & Co. in the principal amount of One Hundred Ten Million Dollars ($110,000,000). On the Redemption Date, the Redemption Price shall become due and payable upon $40,000,000 of such Note. Payment of the Redemption Price shall be made, on or after the Redemption Date, at the office of the Trustee. FROM AND AFTER THE REDEMPTION DATE, INTEREST ON THE PORTION OF THE NOTE THAT IS REDEEMED SHALL CEASE TO ACCRUE. After the Redemption Date, upon surrender of the outstanding Note, a new Note in principal amount equal to the unredeemed portion shall be issued upon cancellation of the original Note.

The Trustee will act as Paying Agent with respect to the partial redemption of the Note. As required by the Indenture, the redeemed Note must be presented and surrendered to the Paying Agent in order to receive payment of the Redemption Price. Payment of the Redemption Price including the accrued interest to the Redemption Date will be made on or after the Redemption Date, upon presentation and surrender of the Note to the Trustee at one of the addresses set forth below:

A $25.00 wire transfer fee will be deducted from each payment requested to be made by wire. When inquiring about this redemption, please inform the customer service representative of the CUSIP number of the affected security. Customer Service can be reached TOLL FREE at 1-800-344-5128.

Unless the Company defaults in making the Redemption Payment, interest on the portion of the Note being redeemed will cease to accrue on and after the Redemption Date, and the only remaining right that the holder of the Note will have with respect to the portion of the Note that was redeemed is to receive payment of the Redemption Price upon surrender to the Paying Agent of the Notes.

IMPORTANT TAX INFORMATION

Under the Internal Revenue Code of 1986, the Paying Agent may be obligated to withhold 28% from payments of the Redemption Price to holders who have failed to furnish the Paying Agent with a correct Taxpayer Identification Number. To avoid the application of these provisions, a holder should submit its

certified Taxpayer Identification Number on a properly completed IRS Form W-9 (available at http://www.irs.gov) when presenting its certificates (or should submit a properly completed IRS Form W-8BEN or other certification establishing an exemption from withholding, if applicable).

*This CUSIP Number has been assigned to this issue by Standard & Poor’s Corporation and is included solely for the convenience of the Note holders. None of the Company, the Trustee or the Paying Agent shall be responsible for the selection or use of this CUSIP Number and no representation is made as to the correctness or accuracy of the CUSIP number listed in any redemption notice or printed on the Notes.

Page 2 of Exhibit 99.1