1.1 本试验方法涵盖了测量微孔聚氨酯弯曲回复率的程序和设备。 1.2 以国际单位制表示的数值应视为标准值。 1.3 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。 注1: 没有已知的ISO等效于本标准。 1.4 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 本试验方法用于表明材料在绕12.7-mm（0.5-in.）弯曲180°后的恢复能力室温下的直径心轴。 4.2 在继续进行本试验方法之前，应参考被测材料的任何规范。材料规范中涵盖的任何试样制备、调节或尺寸或其组合以及测试参数应优先于这些测试方法中提及的参数。如果没有材料规范，则默认条件适用。 注2: 本试验方法适用于固体聚氨酯。

1.1 This test method covers the procedure and apparatus for measuring the flexural recovery of microcellular urethanes. 1.2 The values stated in SI units are to be regarded as standard. 1.3 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. 1.4 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 This test method is used to indicate the ability of a material to recover after a 180° bend around a 12.7-mm (0.5-in.) diameter mandrel at room temperature. 4.2 Before proceeding with this test method, reference shall be made to any specification for the material being tested. Any test specimen preparation, conditioning, or dimensions, or combination thereof, and testing parameters covered in the materials specification shall take precedence over those mentioned in these test methods. If there are no material specifications, then the default conditions apply. Note 2: This test method is applicable to solid urethanes.