ATMI to Present at Investor Conferences in August and September

ATMI to Present at Investor Conferences in August and September



DANBURY, Conn., July 27  /PRNewswire-FirstCall/ -- ATMI, Inc. (NASDAQ:ATMI)
today announced that it is scheduled to present at several investor conferences
during August and September 2004. Where available, webcast links will be posted
on atmi.com's investor page.

  August

  *  5th - Adams Harkness 24th Annual Summer Seminar, Boston; 3:30 pm local
     time.

  September

  *  7th - Smith Barney Citigroup Technology Conference, New York City; 1:35
     pm local time.
  *  8th - SG Cowen 32nd Annual Fall Technology Conference, Boston; 4:30 pm
     local time.



ATMI provides specialty materials and materials packaging to the worldwide
semiconductor industry. As the Source of Semiconductor Process Efficiency, ATMI
helps customers improve wafer yields and lower operating costs. For more
information, please visit atmi.com. 

DATASOURCE: ATMI, Inc.



CONTACT:  Dean Hamilton of ATMI, Inc., direct, [phone], or

[phone], ext. 4202, or 



Web site:  http://www.atmi.com/ 

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