The standard provides a test method for exposure of Non-metallic materials in the atmospheric environment. This standard is used to evaluate the durability of materials in the natural environment, taking into account the influence of various factors such as UV radiation, Humidity, temperature, dry and wet cycles on the material. Due to the complexity and variability of the natural environment, the test recommends multiple exposures under different climate conditions to obtain a more accurate durability assessment. The standard also emphasizes the importance of control samples to ensure the Reliability of the test results. This method is not suitable for corrosion testing of bare metals or testing behind Glass.