1.1 本试验方法包括测定层压复合垫片材料在室温下的短时压缩性和恢复性。 1.2 本试验方法不适用于长时间施加应力下的压缩性试验，即“蠕变”，也不适用于在这种长时间施加压力后的恢复，其逆过程通常称为“压缩永久变形”。此外，它仅适用于室温下的试验。 1.3 以国际单位制表示的值应被视为标准。括号中给出的英寸-磅单位仅供参考。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 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====== 3.1 本试验方法旨在比较受控条件下相关层压复合垫片材料及其在室温下的短时压缩性和恢复性。它使用一对匹配的相对的上下穿透器来测量压缩性，与使用上穿透器和下砧的方法相比，这种方法提供了更好的精度和偏差。很难用层压复合垫片材料制备不变形的试样，这些垫片材料将平放在铁砧上。此外，由于许多复合材料具有刚性内层，上穿透器上的载荷分布在底部砧座区域，导致压缩性读数低于实际值。当买方和生产商达成一致意见时，该测试方法可以用作常规测试方法。

1.1 This test method covers determination of the short-time compressibility and recovery at room temperature of laminated composite gasket materials. 1.2 This test method is not intended as a test for compressibility under prolonged stress application, that is “creep,” or for recovery following such prolonged stress application, the inverse of which is generally referred to as “compression set.” Also, it is only intended for tests at room temperature. 1.3 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only. 1.4 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. 1.5 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 ====== 3.1 This test method is designed to compare related laminated composite gasket materials under controlled conditions and their short-time compressibility and recovery at room temperature. It measures compressibility with a matched pair of opposing upper and lower penetrators which provide better precision and bias than methods using an upper penetrator and a lower anvil. It is difficult to prepare undistorted test specimens from laminated composite gasket materials which will lay flat on an anvil. Also, with many composites having rigid inner layers the load on the upper penetrator is distributed over the bottom anvil area resulting in a lower than actual compressibility reading. This test method may be used as a routine test method when agreed upon between the purchaser and the producer.