May 20, 2008 — Polypore International, Inc. today announced that through its wholly owned subsidiary, Celgard, LLC, the company has closed on the previously announced acquisition of 100 percent of the outstanding capital stock of Yurie-Wide Corp., a South Korean company, for approximately $23 million in cash, including acquisition-related costs.

About Polypore International, Inc.
Polypore International, Inc. is a global high-technology filtration company specializing in microporous membranes. Polypore’s flat sheet and hollow fiber membranes are used in specialized applications that require the removal or separation of various materials from liquids, primarily in the ultrafiltration and microfiltration markets. Based in Charlotte, NC, Polypore International, Inc. is a market leader with manufacturing facilities or sales offices in ten countries serving six continents.

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About Celgard, LLC
Celgard, LLC — part of Polypore’s Energy Storage business segment — is a global leader in the development and production of specialty microporous membranes, including separators used in rechargeable lithium-ion batteries for personal electronic devices such as notebook computers, mobile telephones, digital cameras, and other high performance applications such as power tools, hybrid-electric vehicles (HEVs) and fuel cells. A key component in lithium-ion batteries, the separator is an ultra-thin microporous plastic membrane that separates the battery’s positive and negative electrodes and facilitates ion flow.

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