GB/T 13643-1992 in English

《GB/T 13643-1992硫化橡胶或热塑性橡胶 压缩应力松弛的测定 环状试样》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
本标准规定了三种测定硫化橡胶或热塑性橡胶环状试样压缩应力松弛的方法。本标准适用于测定恒定压缩应变状态下的硫化橡胶或热塑性橡胶环状试样，在一定温度的介质中作用不同时间后其压缩力的变化。

Scope

This standard specifies three methods for determining the compressive stress relaxation of vulcanized rubber or thermoplastic rubber ring specimens. This standard is applicable to the determination of the change of compressive force of vulcanized rubber or thermoplastic rubber ring-shaped specimens in a medium at a certain temperature for different times under a constant compressive strain state. Method A: Compress the sample at the test temperature and perform the measurement of the total compression force. Method B: Compress the sample at standard laboratory temperature and perform the determination of the total compression force. Method C: Compress the sample at the standard laboratory temperature, and perform the determination of the total compression force at the test temperature. Note: The values obtained by the three methods A, B and C are different, and the results cannot be compared with each other. The appropriate test method should be selected according to the purpose of the test.