This is a national standard concerning key materials for hydrogen energy core components. It specifies the technical requirements, test methods, and quality specifications for microporous polytetrafluoroethylene membranes (ePTFE membranes) used to reinforce proton exchange membranes. These products are primarily applied in new energy fields such as fuel cells. To evaluate their performance as reinforcing substrates, the test methods described in the standard typically require a variety of specialized instruments, such as pore size analyzers for porous materials to assess the core porous structure, differential pressure gas permeability testers to determine key barrier properties, and water vapor transmission rate testers to measure water vapor barrier performance.