本规范涵盖通过模压和烧结制造的板材形式的未填充聚四氟乙烯（PTFE）。该板材通常用于要求化学惰性高达500 mDC（260 mDF）的机械零件，如绝缘、密封和轴承，但使用不限于此类应用。

This specification covers virgin, unfilled polytetrafluoroethylene (PTFE) in the form of sheet, manufactured by compression molding and sintering.This sheet has been used typically for mechanical parts such as insulation, seals, and bearings, requiring chemical inertness up to 500 \mDC (260 \mDF), but usage is not limited to such applications.