The ASTM D 5894-2021 standard specifies a cyclic salt fog and UV exposure test method for painted metallic materials by alternating exposure in a salt fog/drying oven and UV/condenser to simulate corrosion conditions in the outdoor environment. The standard is designed to provide a more realistic environment simulation to help evaluate the durability of coated materials under the combined action of multiple climate factors. Test results can be used to compare the relative durability of different materials, but are not fully representative of actual outdoor conditions. The standard states that exposure test results should be interpreted with caution to avoid direct correlation of laboratory data with actual conditions of use. The standard applies to durability testing of painted metals, but the suitability of specific Coating systems needs to be further evaluated.