T/WS 0006-2023 Active

Scope: This standard specifies the product classification, basic requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage, and quality commitments for flame-retardant polypropylene Mylar films used in lithium batteries (hereinafter referred to as Mylar films). This standard applies to Mylar films made by extrusion and calendering using polypropylene as the main raw material and adding appropriate additives. Main technical contents: **Mechanical properties**: - Tensile strength, MPa: longitudinal ≥ 29, transverse ≥ 27 - Elongation at break, %: longitudinal ≥ 480, transverse ≥ 430 - Puncture strength, N/mm ≥ 80 - Wettability tension a (after corona treatment, on the backside of the adhesive layer), mN/m ≥ 38 (a). The wettability tension only applies to corona-treated Mylar films. **Electrical properties**: - Dielectric strength, kV/mm ≥ 65 - Volume resistivity, Ω·cm ≥ 1×1016 - Surface resistivity, Ω ≥ 5×1014