Polytetrafluoroethylene film & manufacture of same

摘要

Polytetrafluoroethylene thin film comprising a thin film of polytetrafluoroethylene having thickness of ≤20 mu m; surface roughness (Ra) of ≤0.1 mu m; tensile strength of ≥80 N/mm<2>; and light beam transmittance of ≥80% for light of 500 nm wavelength. A process for manufacture of polytetrafluoroethylene film comprising compressing porous polytetrafluoroethylene film at a temperature above the melting point of the film, followed by cooling to a temperature below the melting point of the film while continuing to apply pressure.