GB/T 2423.38-2021 "Environmental testing Part 2: Test methods, test R: Water test methods and guidelines" regulates various test methods and guidelines involving water in environmental testing. The standard describes in detail the type of water used in the test process, test equipment, operation steps and methods for evaluating test results. Mainly used to evaluate the performance of products under different water environment conditions, including tests for effects on water erosion, soaking, spraying, etc. The standard ensures that the test results are in conformity and comparability, providing a scientific basis for the adaptability of products in the water environment.