ASTM D3361/D3361M-22 Standard Practice for Exposure to Unfiltered Carbon Arc of paints and related coatings specifies an exposure test method for paints and related coatings under unfiltered Carbon Arc Light sources. This standard is mainly used to evaluate the weathering resistance, heat resistance and physical performance changes of coating materials under high temperature and high energy light conditions. It is suitable for Coating development, quality control and durability testing of coating materials. Experiments investigate the performance of coatings under extreme conditions, such as discoloration, flaking or Miscellaneous performance degradation, by simulating the actual exposure environment. This standard applies to all types of coating materials, especially those requiring high temperature and strong light exposure, helping manufacturers improve product performance and ensure coating mass.