GB/T 1687.3-2016 is part 3 of the standard for flexural testing of vulcanized rubber, for compression flexural testing (constant strain type). The standard specifies the test equipment, such as specific compression flexural testing machines, to regulate the sample preparation process. During the test, the vulcanized rubber sample is repeatedly compressed and flexed under constant strain, the temperature rise during the process is monitored, and the fatigue resistance performance is determined according to the degree of fatigue damage after a specific period of time. This standard provides a method for evaluating the performance of vulcanized rubber under compression flexural conditions, helping to ensure the Reliability and durability of related products in practical applications.