硫化橡胶或热塑性橡胶

[中文适用范围]： 本文件规定了两种程序，用于确定硫化橡胶或热塑性橡胶试件所施加的反力的减少，该试件已被压缩至恒定变形并保持在预定的测试温度下。反力可以通过连续测量系统或不连续测量系统来确定。规定了两种测试方法，方法 A 和方法 B。在方法 A 中，压缩和所有反力测量均在测试温度下进行，在方法 B 中，压缩和所有反力测量均在标准实验室温度下进行。方法 A 和方法 B 给出的结果不同，因为在方法 B 中，材料从测试温度到标准实验室温度的收缩包含在结果中。本文件中规定了两种形式的试件：圆柱形试件和环。只有在尺寸和形状相似的试件上进行结果比较时，结果才有效。环形试件的使用特别适合于确定液体环境中的应力松弛。本文件仅涉及在恒定环境温度或高温下的测试。未规定在低于标准实验室温度的温度下进行测试。这些方法已用于低温测试，但其在这些条件下的可靠性尚未得到证实。 [外文原描述]： This document specifies two procedures for determining the decrease in counterforce exerted by a test piece of vulcanized or thermoplastic rubber which has been compressed to a constant deformation and maintained thus at a predetermined test temperature. The counterforce can be determined either by means of a continuous-measurement system or by a discontinuous-measurement one. Two test methods are specified, method A and method B. In method A the compression and all measurements of counterforce are made at test temperature and in method B the compression and all measurements of counterforce are made at standard laboratory temperature. Method A and method B do not give the same results, as in method B the shrinkage of the material from the test temperature to standard laboratory temperature is included in the result. Two forms of test piece are specified in this document: cylindrical test pieces and rings. Comparison of results is valid only when made on test pieces of similar size and shape. The use of ring test pieces is particularly suitable for the determination of stress relaxation in liquid environments. This document deals only with testing at constant ambient or elevated temperature. Testing at temperatures below standard laboratory temperature is not specified. The methods have been used for low‑temperature testing, but their reliability under these conditions is not proven.