Not all manufacturers have stringent processes in place to ensure the quality and integrity of their single-use technologies. In cases where testing does occur, the preferred method is pressure decay testing. This test, however, is not known to be sensitive enough to detect very small leaks. Additionally, this and other methods typically test only the bag chamber and not the fully-assembled vessel with fittings, tubings, and connectors attached.

Products tested by HIT will initially be marketed to specific application areas within the bioprocessing industry, for example, biopharma downstream processing, final fill and finish, cell therapies, and personalized medicine.

About ATMI

ATMI, Inc. provides specialty semiconductor materials, leading-edge materials development science, 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 .

About ATMI LifeSciences

ATMI LifeSciences is a leader in single-use mixing, storage, and bioreactor technology, fluoropolymer-based products, and custom-engineered, flexible packaging solutions. The business's fundamental knowledge of polymers, specially selected resins, and its clean room manufacturing experience combine to help drive optimum performance in critical disposable process operations. For more information, please visit .

The ATMI, Inc. logo is available at

ATMI, the ATMI logo, and Integrity are trademarks or registered trademarks of ATMI, Inc., in the United States, other countries or both.

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 2011 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, commercializing and delivering new products; problems or delays in integrating acquired operations and businesses; uncertainty in the credit and financial markets; and other factors described in ATMI's Form 10-K for the year ended December 31, 2010, and other subsequent 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.
CONTACT: Dean Hamilton         Director, ATMI Investor Relations & Corporate Communications         203.207.9349, Direct         203.794.1100 x4202                  Media Enquiries - Impress Public Relations:                  Richard Kerns         + 44 (0)161-728-5880                  Beth Willers         + (1) 503-928-7828

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