1.1 本试验方法描述了一种温度收缩程序，用于快速评估结晶效应，并比较橡胶和类橡胶材料在低温下的粘弹性。当与其他低温试验结合使用以选择适合低温服务的材料时，该试验方法很有用。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 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。 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 硫化胶收缩时的温度差10 % （TR10）和硫化胶收缩的温度70 % （TR70）随着结晶倾向的增加而增加。 4.2 TR70与低温压缩永久变形相关。 4.3 已发现TR10与基于类似类型聚合物的硫化胶中的脆性点相关。 4.4 一般认为，收缩率与可结晶和非结晶橡胶的低温柔韧性有关。

1.1 This test method describes a temperature-retraction procedure for rapid evaluation of crystallization effects and for comparing viscoelastic properties of rubber and rubber-like materials at low temperatures. This test method is useful when employed in conjunction with other low-temperature tests for selection of materials suitable for low-temperature service. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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. 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 The difference between the temperature at which a vulcanizate retracts 10 % (TR10) and the temperature at which a vulcanizate retracts 70 % (TR70) increases as the tendency to crystallize increases. 4.2 TR70 correlates with low-temperature compression set. 4.3 TR10 has been found to correlate with brittle points in vulcanizates based on polymers of similar type. 4.4 In general, the retraction rate is believed to correlate with low-temperature flexibility of both crystallizable and noncrystallizable rubbers.