ASTM C346-1987 (2009) specifies a method for measuring specular gloss of 45 degrees for Pottery and porcelain materials. It is suitable for comparing the gloss of Pottery and porcelain products and assessing their corrosion resistance and abrasion resistance through Gloss loss. The method involves measuring the intensity of reflected light using a specific geometric angle Glossiness Meter to determine the gloss value of the specimen. The standard emphasizes the importance of safety and health practices and states that the user is responsible for determining the applicability of regulatory restrictions.