Polytetrafluoroethylene porous membrane, waterproof breathable membrane and waterproof breathable member using the same

摘要

In the polytetrafluoroethylene (PTFE) porous membrane of the present disclosure, the moisture permeability in the film thickness direction measured in accordance with the provisions of Japanese Industrial Standard (JIS) L1099 (B-1 method) is 150,000 g / (m 2 · day). That's it. When the PTFE porous membrane of the present disclosure is attached as a waterproof breathable membrane to a housing such as an electrical component or an electrical product, water vapor staying inside the housing can be discharged more quickly to the outside of the housing.