1.1 这些试验方法涵盖了拟用于橡胶在空气或液体介质中承受压缩应力的应用中的橡胶试验。它们特别适用于机械安装件、减震器和密封件中使用的橡胶。包括以下三种测试方法: 试验方法 部分 A-空气中恒力下的压缩永久变形 8 – 11 B-空气中恒定挠度下的压缩永久变形 12 – 15 C-考虑材料硬度的空气中恒定挠度下的压缩永久变形 16 – 21 1.2 测试方法的选择是可选的，但应考虑可能寻求测试结果相关性的服务的性质。 除非详细规范中另有规定，否则应使用试验方法B。 1.3 试验方法B不适用于硬度大于90 IRHD的硫化胶。 1.4 以国际单位制表示的数值应视为标准。 1.5 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。 1.6 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。 ====意义和用途====== 4.1 压缩永久变形试验旨在测量橡胶化合物在长期压缩应力作用后保持弹性的能力。实际的应力作用可能涉及保持一定的挠度、持续施加已知力，或由间歇压缩力引起的快速重复变形和恢复。尽管后一种动态应力与其他动态应力一样会产生压缩永久变形，但通过压缩-弯曲或滞后试验更接近地模拟其整体效应。 因此，压缩永久变形试验主要适用于涉及静应力的工作条件。测试经常在高温下进行。

1.1 These test methods cover the testing of rubber intended for use in applications in which the rubber will be subjected to compressive stresses in air or liquid media. They are applicable particularly to the rubber used in machinery mountings, vibration dampers, and seals. Three test methods are covered as follows: Test Method Section A—Compression Set Under Constant Force in Air 8 – 11 B—Compression Set Under Constant Deflection in Air 12 – 15 C—Compression Set Under Constant Deflection in Air Considering Material Hardness 16 – 21 1.2 The choice of test method is optional, but consideration should be given to the nature of the service for which correlation of test results may be sought. Unless otherwise stated in a detailed specification, Test Method B shall be used. 1.3 Test Method B is not suitable for vulcanizates harder than 90 IRHD. 1.4 The values stated in SI units are to be regarded as the standard. 1.5 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. 1.6 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. ====== Significance And Use ====== 4.1 Compression set tests are intended to measure the ability of rubber compounds to retain elastic properties after prolonged action of compressive stresses. The actual stressing service may involve the maintenance of a definite deflection, the constant application of a known force, or the rapidly repeated deformation and recovery resulting from intermittent compressive forces. Though the latter dynamic stressing, like the others, produces compression set, its effects as a whole are simulated more closely by compression flexing or hysteresis tests. Therefore, compression set tests are considered to be mainly applicable to service conditions involving static stresses. Tests are frequently conducted at elevated temperatures.