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Polypropylene PP Battery Separator Celgard 2400 Separator for Li-ion Battery. Customized Thickness: Available in 25um and customized thickness options. Wide Thermal Stability: Stable across a wide thermal range for electric drive vehicles. Lifetime Technical Support: Lifetime online technical support service provided. One Year Limited Warranty: Includes one year limited warranty for equipment. CE Certified: Most products have passed CE testing. High Tensile Strength: MD tensile strength reaches 1700 Kg/cm^2. High Porosity: Porosity level is 41% for optimal performance.