Celgard® products were initially developed in the mid-1960s at the Celanese Research Labs in Summit, New Jersey, USA. By the mid-1970s, our membranes enjoyed commercial success as a key component in blood oxygenation devices commonly used in open heart surgery.

Celgard has been developing and producing separators for primary (single-use) lithium batteries since the early 1980s, and for secondary (rechargeable) lithium batteries since the early 1990s.

Since 2015, Celgard has operated as a subsidiary of the Asahi Kasei Group, a diversified group of companies that operates in the Environmental Solutions, Mobile & Industrial, and Life Innovation business sectors.

First microporous film patents granted in the late 1960s, leading to commercial sales of Celgard® membranes.

Celgard® membranes sold as a key component in blood oxygenation devices.
Celgard® monolayer polypropylene (PP) membranes first introduced to the U.S. Army for use in lithium-sulfur dioxide (Li-SO2) battery cells.

Full-scale development and production of Celgard® separators for primary (single-use) lithium batteries begins.
Charlotte, North Carolina, USA facility is built in 1986.

First commercial sales into the secondary (rechargeable) lithium-ion battery market.
Celgard® Trilayer (PP/PE/PP) technology is developed.
First expansion of the Charlotte, USA facility in 1997.

Ceramic coated separator technology is developed.
Expansion into Asia with facilities in China in 2005.
Additional expansions of the Charlotte, USA facility in 2004, 2008, 2010 and 2011.
Concord, North Carolina, USA facility built in 2011.
Celgard is acquired by Asahi Kasei Corporation in 2015.
Expansion of the Concord, USA facility in 2017.

Further expansion into China with establishment of Jiangxi Enpo New Materials Co., Ltd (ENPO), a joint venture between Celgard and SEMCORP aimed at supporting the local EDV and ESS markets

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