WHAT:     Entegris, Inc., is participating in and helping to sponsor
          Fuel Cell 2005, held this week in Minneapolis, Minn. The
          company's science and technical expert Chuck Extrand is also
          delivering a major presentation, Gas Permeation Resistance
          of Balance of Plant Materials.

WHERE:    The Hyatt Regency Hotel in downtown Minneapolis

WHEN:     FUEL CELL 2005                     ENTEGRIS PRESENTATION
          June 7-8, 2005                     June 8, 2005
          June 7, 7:00 a.m.-4:30 p.m.        10:30 a.m.-11:15 a.m.
          June 8, 7:30 a.m.-3:00 p.m.


OVERVIEW: From concept to commercialization Entegris combines its
          materials expertise, advanced technology and manufacturing
          competencies to assist fuel cell system developers to go
          from research and development to commercial applications.
          Entegris' solutions have proven to lower costs and improve
          reliability of fuel cell systems. The company produces
          components and subassemblies for some of the largest fuel
          cell system developers in the world today.

          "Entegris is proud to be a key participant and major sponsor
          of the fuel cell show in Minneapolis this week," said John
          Goodman, senior vice president and director of fuel cells
          marketing for Entegris.  "Advancing fuel cells as an
          alternative energy source will produce real benefits in
          terms of our country's energy security, protecting the
          environment and creating new jobs. Entegris brings its
          global market leadership and advanced technology to help
          keep this exciting new industry moving forward."

ABOUT ENTEGRIS:

Entegris products and services protect and transport the critical materials that enable the world's leading technologies. Entegris is the leading materials integrity management company providing products and services used from production to consumption in the semiconductor, data storage, chemical processing, pharmaceutical, fuel cell and other high technology industries worldwide. Entegris is headquartered in Chaska, Minnesota, and has manufacturing facilities in the U.S., France, Germany, Japan, Malaysia, Singapore and Taiwan. Additional information can be found at: www.entegris.com

SOURCE: Entegris, Inc.

Entegris, Inc., Chaska
Bill Paterson, 952-556-4155
Fax: 952-556-4078
bill_paterson@entegris.com