CHASKA, Minn.--(BUSINESS WIRE)--Sept. 1, 2005--In BW5555 issued Sept. 1, 2005: Please replace the release with the following corrected version due to multiple revisions.

    The corrected release reads:

    ENTEGRIS TO HOLD MERGER INTEGRATION UPDATE CALL

Entegris, Inc. (Nasdaq:ENTG), a leader in materials integrity management, will hold an investor conference call with management on Monday, September 12, 2005 at 11:00 a.m. Eastern Time (ET). The purpose of the call is to provide an update on the integration of the Company's merger with Mykrolis Corporation, which closed on August 6, 2005.

To participate, please call (800) 289-0533 (domestic) or (913) 981-5525 (international) using passcode 5610324 and ask for the "Entegris Conference Call." Participants are asked to dial in 5 to 10 minutes prior to the start of the call.

Interested parties will have access to a replay of the call starting September 12, 2005 at 2:00 p.m. (ET) until midnight Monday, September 26, 2005. The replay will be accessible by dialing 888/203-1112 conference code 5610324.

The call will also be available in "listen-only" mode from the Entegris Web site. Point your web browser to www.entegris.com/investors and follow the link to the web cast. The RealAudio^™ on-demand playback will be available for 14 days after the conclusion of the teleconference on the Entegris Web site.

ABOUT ENTEGRIS

Entegris products and services purify, protect and transport the critical materials enabling the world's leading technologies. As a leading materials integrity management company, Entegris provides products and services used in the semiconductor and other high-tech industries. Entegris is ISO 9001 certified and has manufacturing or service facilities in the United States, Germany, Japan, Malaysia and Singapore. Additional information can be found at www.entegris.com.

    CONTACT: Entegris, Inc., Chaska
             Investor Relations:
             Steven Cantor, 978-436-6750
             irelations@entegris.com

    SOURCE: Entegris, Inc.