1.1 本规范旨在指出工业或消费者使用的成品塑料零件。 1.2 本规范涵盖成品零件和加工零件的形状，由半结晶聚酰亚胺（PI）制成。 1.3 本规范旨在取代MIL-R-46198和临时标准规范PS 93 注1: 没有已知的ISO等效于本标准。 1.4 本规范涵盖由半结晶聚酰亚胺制成的零件，半结晶聚酰亚胺是一种热固性材料，通过DMA不会软化或熔化( D4065 )在260°C（500°F）或以下。 1.5 由于PI是一种热固性树脂，因此不包括回收产品的规定。 1.6 本规范中概述的分类系统旨在与国防部20多年来使用的分类系统相同。 目前不打算进行任何更改。 1.7 这些值以国际单位制表示，并在所有特性和尺寸表中视为标准值。出于参考目的，括号中列出了英寸-磅单位。 1.8 应用程序- 本规范中的零件通常用于需要以下性能组合的应用:低摩擦系数、低热膨胀和耐热性，可在高达260°C（500°F）的温度下连续运行，并可短期漂移至482°C（900°F）。 1.9 以下预防性警告仅适用于试验方法部分第节 12 ，本规范: 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户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。 1.10 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。

1.1 This specification is intended to be a means of calling out finished plastic parts ready for industrial or consumer use. 1.2 This specification covers finished parts and shapes from which parts are machined, made from a semi-crystalline polyimide (PI). 1.3 This specification is intended to replace MIL-R-46198 and Provisional Standard Specification PS 93. Note 1: There is no known ISO equivalent to this standard. 1.4 This specification covers parts made from semi-crystalline polyimide, which is a thermosetting material that shows no softening or melting by DMA ( D4065 ) at or below 260°C (500°F). 1.5 Since PI is a thermoset resin, no provisions are included for recycled products. 1.6 The classification system outlined in this specification is intended to be identical to that used by Department of Defense for over 20 years. No changes are intended at this time. 1.7 The values are stated in SI units and are regarded as standard in all property and dimensional tables. For reference purposes, inch-pound units are stated in parentheses. 1.8 Application— Parts in this specification are generally used for applications requiring the following combination of properties: low coefficient of friction, and low thermal expansion coupled with heat resistance for continuous operation at temperatures up to 260°C (500°F) and for short-term excursions upward to 482°C (900°F). 1.9 The following precautionary caveat pertains only to the test method portion, Section 12 , 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. 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.