This standard specifies the slow strain rate tensile test method for determining the environmental stress cracking (ESC) resistance of thermoplastic plastics in chemical media. It precisely accelerates and evaluates the stress corrosion cracking process by stretching specimens immersed in specific media at a constant and slow rate. This method is part of a series of standards and is suitable for comparing the cracking resistance of different plastics or the same plastic under various environmental conditions. The core instrument for conducting this test is the slow strain rate stress corrosion testing machine, which must provide an extremely low and precisely controllable strain rate. Additionally, the test typically requires the use of environmental chambers or constant-temperature baths capable of holding chemical media.