Trilayer PP/PE/PP

SEM Cross-Section Photomicrograph of

Celgard® Trilayer PP/PE/PP Battery Separator

Celgard's proprietary trilayer technology is a key feature which differentiates Celgard® battery separators from those manufactured by other battery separator suppliers. This unique process capability allows Celgard to combine the inherent benefits of polypropylene (PP) and polyethylene (PE) membranes into a single flat-sheet lithium battery separator.

Features of Celgard® PP/PE/PP Trilayer Separators:

• Produced using a dry-stretch manufacturing process
• Excellent resistance to acids, bases, and most chemicals
• Uniform pore structure with high chemical and thermal stability
• Zero TD shrinkage for reduced internal shorting and improved high temperature dimensional stability
• PP outer layers that provide oxidation resistance for excellent cycling & trickle charge performance
• PE inner layer that provides high-speed shutdown capability

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