1.1 这些试验方法涵盖了在暴露于工业液压流体和热老化后测量O形环形式弹性体密封件物理性能的程序。然后将测量的性能与未暴露于工业液压流体和热老化的弹性体密封件的物理性能进行比较。当将这些特性的变化与 表1 。 1.2 虽然这些测试方法涉及O型环的使用，但它们也可用于评估特种密封件的弹性体化合物与工业液压流体的兼容性及其耐热老化性。这些化合物可以模制成O形环，用于评估目的。 1.3 这些试验方法提供了在一定的温度和时间条件下将O型环试样暴露于工业液压流体的程序。 通过将浸入试验流体后的功函数、硬度、物理性能、压缩永久变形和密封体积的变化与浸入前的值进行比较，确定O形环材料的劣化。 1.4 以国际单位制表示的数值应视为标准。 1.4.1 例外-- 括号中给出的值仅供参考。 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。 1.6 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。 ===意义和用途====== 4.1 当测试一种以上的弹性体密封材料时，测试方法会产生比较数据，作为判断预期使用质量的基础。提供了建议的在役特性变化限值。超过这些限制的性能变化将表明弹性体密封的使用寿命有限。 4.2 这些测试方法试图通过控制老化和评估性能变化来模拟使用条件，但由于实际使用条件差异很大，因此可能与实际零件性能没有任何直接相关性。这些测试方法产生了理想使用条件下弹性密封材料的性能变化的比较数据和指示。这些测试方法可用于质量控制、工程评估、服务评估和制造控制。来自这些测试方法的信息可以用于预测预期的服务质量。

1.1 These test methods cover the procedure for measuring physical properties of elastomer seals in the form of O-rings after exposure to industrial hydraulic fluids and thermal aging. The measured properties are then compared to the physical properties of elastomer seals that have not been exposed to the industrial hydraulic fluids and thermal aging. The changes in these properties form a basis for assessing compatibility when these changes are compared against the suggested limits in Table 1 . 1.2 While these test methods involve the use of O-rings, they can also be used to evaluate the compatibility of the elastomeric compounds of specialty seals with industrial hydraulic fluids and their resistance to thermal aging. The compounds can be molded into O-rings for evaluation purposes. 1.3 These test methods provide procedures for exposing O-ring test specimens to industrial hydraulic fluids under definite conditions of temperature and time. The resulting deterioration of the O-ring material is determined by comparing the changes in work function, hardness, physical properties, compression set, and seal volume after immersion in the test fluid to the pre-immersion values. 1.4 The values stated in SI units are to be regarded as the standard. 1.4.1 Exception— The values given in parentheses are for information only. 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 When more than one elastomer seal material is tested, the test methods yield comparative data on which to base judgements as to expected service quality. Suggested in-service property change limits are provided. Property changes beyond these limits will indicate limited service life of the elastomer seal. 4.2 These test methods attempt to simulate service conditions through controlled aging and evaluation of property changes but may not give any direct correlations with actual part performance since actual service conditions vary widely. These test methods yield comparative data and indications of property changes of the elastomeric seal material under ideal service conditions. These test methods can be used for quality control purposes, for engineering assessments, for service evaluation, and for manufacturing control. The information from these test methods can be used to anticipate expected service quality.