This standard is part of a series of methods, specifying the test method for determining the environmental stress cracking resistance of thermoplastic plastics by subjecting plastic specimens to and maintaining a fixed bending deformation while exposing them to chemical media. This method is particularly suitable for evaluating the cracking resistance of sheets, flat specimens, and especially their localized surface areas under the influence of gases, liquids, or migratable solid substances. For testing, it typically requires the use of bending fixtures or bending test devices capable of producing precise deformation, as well as environmental chambers or constant-temperature immersion containers for holding and controlling the chemical media.