GB/T 7758-2020 specifies the TR test method for the determination of the low temperature performance of vulcanized rubber. The standard specifies the test equipment, which needs to be able to precisely control the temperature and measure the retraction rate. Detailed description of the sample preparation, cooling and heating operation steps, by stretching the vulcanized rubber sample at low temperature, observe its retraction with temperature rise, and present the low temperature performance with temperature retraction Linear dispersion. This provides a scientific basis for evaluating the flexibility and resilience of vulcanized rubber in low temperature environments, and helps enterprises produce Rubber suitable for low temperature conditions.