ATMI Appoints New Board Member

ATMI, Inc. (Nasdaq: ATMI), a supplier of specialty
materials and high-purity materials handling and delivery solutions to
the world's leading semiconductor manufacturers, today announced the
appointment of former U.S. Under Secretary of Commerce for Technology,
Cheryl L. Shavers, Ph.D., to the board of directors.
   Gene Banucci, Chairman of the Board of ATMI, said, "We are
delighted to welcome to the ATMI board a leader with the depth of
experience and global perspective of Dr. Shavers, who represents the
perfect blend of scientific expertise and practical business
development acumen."
   Dr. Shavers said, "ATMI is playing a pivotal role in enabling
successful, efficient production of the most advanced designs in
integrated circuits. It's an exciting time to be joining an
industry-leading company."
   Dr. Shavers, who is Chief Executive Officer of Global Smarts,
Inc., a global business and technology strategy firm based in Santa
Clara, CA, has more than 25 years of experience in the high-tech
industry in various engineering and managerial positions at Fortune
500 companies such as Motorola, Hewlett-Packard, Varian Associates,
and Intel Corporation.
   Dr. Shavers also is a member of the board of directors of Rockwell
Collins and director of Strategic Investments and Relationships at
Media Tech Capital Partners, a private merchant bank.
   From 1999 to 2001, Dr. Shavers was Under Secretary of Commerce for
Technology at the Department of Commerce, in which capacity she
oversaw the Commerce Department's Technology Administration and the
Office of Technology Policy, as well as the National Institute of
Standards and Technology (NIST), the National Technical Information
Service, and the Office of Space Commercialization.
   She held a variety of positions from 1987 to 1999 at Intel,
including Director of Emerging Technology in the Microprocessor Sector
Group at Intel Capital, where she led technology assessments of
emerging technologies, structured strategic business alliances, and
oversaw domestic and international equity investments and/or
acquisitions of high-tech companies. Dr. Shavers holds a Bachelor's
degree in Chemistry, a Ph.D. in Solid State Chemistry, both from
Arizona State University, and an Honorary Master's degree in
Engineering Management from California Polytechnic State University.
She is also a practicing registered Patent Agent with the Patent &
Trademark Office of the Department of Commerce.
   ATMI provides specialty materials and high-purity materials
handling and delivery solutions to the worldwide semiconductor
industry. For more information, please visit atmi.com.

   Statements contained herein that relate to ATMI's future
performance, including, without limitation, statements with respect to
ATMI's anticipated results of operations or level of business for 2006
or any other future period, are forward-looking statements within the
safe harbor provisions of the Private Securities Litigation Reform Act
of 1995. Such statements are based on current expectations only and
are subject to certain risks, uncertainties, and assumptions,
including, but not limited to, changes in semiconductor industry
growth (including, without limitation, wafer starts) or ATMI's
markets; competition, problems, or delays developing and
commercializing new products; problems or delays in integrating
acquired operations and businesses; and other factors described in
ATMI's filings with the Securities and Exchange Commission. Such risks
and uncertainties may cause actual results to differ materially from
those expressed in our forward-looking statements. ATMI undertakes no
obligation to update any forward-looking statements.