This is a standard test method for evaluating the dynamic durability of rubber products, primarily used to simulate the actual working conditions of tires and other rubber products under periodic dynamic loading. The standard specifies the use of a constant-stress flexometer, under conditions of applying a constant amplitude dynamic load, to determine the temperature rise and fatigue resistance of vulcanized rubber. This method helps predict the durability performance of products in actual use but is not suitable for rubber materials with high hardness (above 85 IRHD). Relevant testing instruments typically include professional flexometers equipped with servo control systems capable of precisely controlling load and frequency, and monitoring sample temperature and deformation in real time.