2023DIN EN ISO 6769:2023-02 Vitreous and porcelain enamels - Determination of surface scratch hardness according to the Mohs scale (ISO 6769:2022); German version EN ISO 6769:2022
2023DIN EN ISO 6769:2023 Vitreous and porcelain enamels - Determination of surface scratch hardness according to the Mohs scale (ISO 6769:2022)