Specifies a test method for the tolerance performance of plastics in heat and humidity, water spray and salt fog environments. The standard applies to the evaluation of mass changes, dimensional changes and changes in physical properties of plastics and their articles under the above environment conditions. By simulating moisture absorption and hydrolysis in heat and humidity atmospheres, as well as corrosion effects in salt fog environments, the standard provides a reliable method for evaluating corrosion resistance and long-term stability of plastics. The standard updates the test equipment and exposure conditions and aims to ensure the accuracy and repeatability of test results.