1.1 这些试验方法描述了扭转装置用于测量柔性聚合物材料及其涂层织物的相对低温硬化的用途。还介绍了一种常规检查和验收程序，该程序将用作特定温度下的合格-不合格测试。 1.2 这些测试方法产生了比较数据，以评估柔性聚合物及其涂层织物的低温性能。 1.3 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。 1.4 本标准并不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。 1.5 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====== 4.1 这些试验方法可用于测定柔性聚合物或涂有柔性聚合物的织物的低于常温的硬化度。低温模量是室温下模量的指定倍数或比率的温度是从扭曲与温度曲线插值得到的。这些特定的低温模量与室温模量之比称为 相对模量 在相对模量下的这些温度包括所测试材料的玻璃态和橡胶态之间的过渡区域。 4.2 这些试验方法仅提供刚度表征的一般指南，因为实验材料的使用条件可能与试验条件有很大不同。

1.1 These test methods describe the use of a torsional apparatus for measuring the relative low temperature stiffening of flexible polymeric materials and fabrics coated therewith. A routine inspection and acceptance procedure, to be used as a pass-fail test at a specified temperature, is also described. 1.2 These test methods yield comparative data to assess the low temperature performance of flexible polymers and fabrics coated therewith. 1.3 The values stated in SI units are to be regarded as standard. The values 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 ====== 4.1 These test methods may be used to determine the subnormal temperature stiffening of flexible polymers or fabrics coated with flexible polymers. Temperatures at which the low temperature modulus is a specified multiple or ratio of the modulus at room temperature are interpolated from the twist versus temperature curve. These specified ratios of low-temperature modulus to room-temperature modulus are called relative moduli . These temperatures at the relative moduli encompass the transition region between the glassy and rubbery states of the materials tested. 4.2 These test methods offer only a general guide to stiffness characterization as service conditions of experimental materials may differ greatly from the test conditions.