MYK Mykrolis Corp

Mykrolis Corporation Announces Acquisition and Employment Inducement Stock Option Grants BILLERICA, Mass., Dec. 13 /PRNewswire-FirstCall/ -- Mykrolis Corporation (NYSE:MYK), a leading supplier of components and systems to the semiconductor industry, today announced that Employment Inducement Stock Options covering an aggregate of 1,300 shares had been granted on December 9, 2004 to two newly hired employee of Mykrolis. In accordance with New York Stock Exchange Rule 303A(8), these stock option grants were made under a stock option plan without stockholder approval. Rule 303A(8) requires public announcement of option grants made under this type of plan as well as written notice to the Exchange. All of the above stock options were granted on terms that include the following: seven year duration, exercise price equal to the closing price of Mykrolis stock on the New York Stock Exchange on date of grant, vesting of 25% of the shares on the first anniversary of the grant date, with the balance vesting quarterly thereafter in 12 equal installments. About Mykrolis Mykrolis Corporation, based in Billerica, Massachusetts, is a worldwide developer, manufacturer and supplier of liquid and gas delivery systems, components and consumables used to precisely measure, deliver, control and purify the process liquids, gases and chemicals, as well as the deionized water, photoresists and vacuum systems utilized in the semiconductor manufacturing process. In addition, the Company's products are used to manufacture a range of other products, such as flat panel displays, high purity chemicals, photoresists, solar cells, gas lasers, optical disks and fiber optic cables. For more information, visit http://www.mykrolis.com/. Contacts: Bertrand Loy, Chief Financial Officer Steve Cantor, Director of Investor Relations and Corporate Communications 978-436-6500 DATASOURCE: Mykrolis Corporation CONTACT: Bertrand Loy, Chief Financial Officer, or Steve Cantor, Director of Investor Relations and Corporate Communications both of Mykrolis Corporation, +1-978-436-6500, Web site: http://www.mykrolis.com/

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