The standard specifies a code of practice for exposure testing of Non-metallic materials using an open flame carbon arc instrument. This equipment is designed to simulate the efflorescences effects of material exposure to sunlight and moisture, such as rain or dew, in actual use, without including deterioration caused by localized weather phenomena. The standard covers basic procedures for acquiring, measuring and controlling exposure conditions, but does not specify specific exposure conditions. It is recommended that control materials with known performance be used in testing to facilitate comparison and statistical evaluation. The standard emphasizes safe operating requirements, including ozone emission treatment, and replaces the previous G23 procedure.