This standard is part of a series of safety assessment standards for electrical and electronic products, describing a comparative test method for combustion characteristics based on a specific flame condition. Its purpose is to compare the relative combustion characteristics (such as ignitability and flammability) of different materials in products, as well as their resistance to burn-through, under laboratory conditions. This is achieved by exposing vertically oriented strip-shaped or horizontally oriented plate-shaped specimens to a small flame ignition source with a nominal power of 500 watts. The method is primarily applicable to solid or microporous materials. Conducting this test requires the use of a specific flame test apparatus with a nominal power of 500 watts, which can precisely control the position and duration of flame application to evaluate material performance and conduct grading.