ATMI to Present At Investor Conference

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Tue May 19, 2009 10:20am EDT 

DANBURY, Conn., May 19, 2009 (GLOBE NEWSWIRE) -- ATMI, Inc. (Nasdaq:ATMI) today
announced that it is scheduled to present at the 2009 Cowen and Company
Technology Media and Telecom Conference in New York City on May 28, 2009, at
1:50 p.m. local time. A webcast link will be posted on ATMI.com's investor,
events and presentations page.

ATMI Inc. provides specialty semiconductor materials, and high-purity materials
handling and delivery solutions designed to increase process efficiencies for
the worldwide semiconductor, flat panel, and life sciences industries. For more
information, please visit http://www.atmi.com.

The ATMI, Inc. logo is available at 
http://www.globenewswire.com/newsroom/prs/?pkgid=5254

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CONTACT:  ATMI, Inc.
          Dean Hamilton, Director, ATMI Investor Relations & 
           Corporate Communications
          203.207.9349
          203.794.1100 x4202
          dhamilton@atmi.com
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