GB/T 1685.2 - 2019 Determination of Compressive Stress Relaxation of Focused Vulcanized Rubber or Thermal Plasticity Rubber at Cycle Temperature. It regulates the preparation of the specimen to ensure that it can represent the material properties. Detailed test equipment requirements, including the accuracy and Temperature range of the temperature cycle device. Strict regulations on the test process cover temperature cycle setting, loading mode and stress relaxation Measurement time node. According to this standard, the compressive stress relaxation data of the material at cycle temperature can be accurately obtained, providing a key performance reference for Rubber applications in complex temperature environments, and assisting product design and mass improvement.