The standard provides a method for accelerated exposure testing of coatings using a closed carbon arc device. Its purpose is to assess the durability of coatings under exposure to a closed carbon arc Light source, including performance degradation phenomena such as Color change, blistering, loss of adhesion, etc. The test does not include flaming carbon arc exposure. The standard emphasizes the need to use the same type of carbon arc and conditions for interlaboratory comparisons and recommends at least three sex repeability tests for each material to ensure Reliability and repeatability of results. Test results will depend on the accuracy of equipment operation, such as voltage regulation and environment control.