This standard provides guidelines for the Optical Property evaluation of powder coatings, covering characteristics such as Color, color difference, Gloss, and homochromatic. The guidelines include visual and instrumental evaluation methods. Visual evaluation uses the Munsell color sequence system and ASTM test standards, and instrumental evaluation includes Glossiness testing, photometry, reflection haze, and fluorescence testing. The standard is designed to help users comprehensively evaluate the Optical Property of powder coatings to ensure that they meet the expected mass requirements.