DIN EN ISO 6769 E:2022 玻璃和瓷釉 根據莫氏硬度測定表面劃痕硬度 (ISO/DIS 6769:2022) 草案
Draft Document - Vitreous and porcelain enamels - Determination of surface scratch hardness according to the Mohs scale (ISO/DIS 6769:2022); German and English version prEN ISO 6769:2022