阀门用烧结阀座的PTFE和RPTFE的美标标准号是什么

问：阀门用烧结阀座的PTFE和RPTFE的美标标准号或国标标准号？
答：ASTM D4894-07 Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials.