1.1 本规范旨在为航空航天使用的成品机加工零件提供一种调用方式。此类部件也可用于选定的商业应用中，其中使用具有高分子量、加工过程中良好的分子量保持率、尺寸稳定性、可控结晶度和严格控制的工程公差的部件具有明显的益处。 1.2 本规范规定了由未增塑的100%聚氯三氟乙烯（PCTFE）均聚物加工而成的零件的要求。 1.3 本规范不包括由PCTFE共聚物、厚度小于0.25毫米（0.010英寸）的PCTFE薄膜或胶带或改性PCTFE（含有颜料或增塑剂）加工而成的零件。 1.4 本规范不允许零件含有回收材料。 1.5 本规范不包括用于一般用途的PCTFE零件，其中尺寸稳定性、分子量和结晶度的控制并不重要。 对于一般用途的机加工PCTFE零件，请使用规范 D7211 . 1.6 本规范根据预期用途和暴露情况将零件分为三类:含氧介质、反应介质和惰性介质。 1.7 应用 本规范涵盖的PCTFE成分为纯PCTFE树脂，不含增塑剂和其他添加剂。这些成分在氧气中耐燃烧，尺寸稳定，并满足适合其最终用途的其他特定物理特性。它们用于氧气、空气、氦气、氮气、氢气、氨气和其他航空航天介质系统中的阀门、调节器和其他设备。这些部件通常用作阀座、o形环、密封件和垫圈。在正常的维护程序中，它们会被拆除和更换。这些部件提供了可靠的密封表面，从而使阀门和相关装置正确关闭，并且不会从系统泄漏到环境中。 它们将经历静态机械载荷、循环机械载荷、低温至71°C（160°F）的温度范围，氧气和空气介质的压力高达68.9 MPa（10000，psig），惰性介质的压力为103.4 MPa（15000 psig）。 1.8 以国际单位制表示的数值应视为标准。括号中的值仅供参考。 1.9 以下注意事项仅适用于试验方法部分，第节 13 ，本规范的: 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 注1: 目前还没有与该标准等效的ISO。 1.10 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification is intended to be a means of calling out finished machined parts ready for aerospace use. Such parts may also find use in selected commercial applications where there are clear benefits derived from the use of parts with high molecular weight, good molecular weight retention during processing, dimensional stability, controlled crystallinity, and tightly controlled engineering tolerances. 1.2 This specification establishes requirements for parts machined from virgin, unplasticized, 100 % polychlorotrifluoroethylene (PCTFE) homopolymers. 1.3 This specification does not cover parts machined from PCTFE copolymers, PCTFE film or tape less than 0.25-mm (0.010-in.) thick, or modified PCTFE (containing pigments or plasticizers). 1.4 This specification does not allow parts containing recycled material. 1.5 The specification does not cover PCTFE parts intended for general use applications, in which control of dimensional stability, molecular weight, and crystallinity are not as important. For machined PCTFE parts intended for general use, use Specification D7211 . 1.6 This specification classifies parts into three classes based upon intended uses and exposures: oxygen-containing media, reactive media, and inert media. 1.7 Application— PCTFE components covered by this specification are virgin, 100 % PCTFE resin, free of plasticizers and other additives. The components are combustion resistant in oxygen, dimensionally stable, and meet other specific physical characteristics appropriate for their end use. They are used in valves, regulators, and other devices in oxygen, air, helium, nitrogen, hydrogen, ammonia, and other aerospace media systems. The components typically are used as valve seats, o-rings, seals, and gaskets. They are removed and replaced during normal maintenance procedures. The components provide reliable sealing surfaces resulting in proper closure of valves and related devices and no leakage from the system into the environment. They will experience static mechanical loading, cyclic mechanical loading, temperatures ranging from cryogenic to 71°C (160°F), and pressures up to 68.9 MPa (10,000, psig) for oxygen and air media, and 103.4 MPa (15,000 psig) for inert media. 1.8 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only. 1.9 The following precautionary caveat pertains only to the test methods portion, Section 13 , of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: There is no known ISO equivalent to this standard. 1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.