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Vitreous and porcelain enamels. Determination of surface scratch hardness according to the Mohs scale Ingestion-build-63114 Why should you use BSBS EN 15771: 2010 Vitreous and porcelain enamels. Determination of surface scratch hardness according to the Mohs scale BS EN 15771 is a European Standard specifies a method of test for determining the scratch hardness of the surface of vitreous and porcelain enamels. Contents of BS EN 15771: Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Reference minerals 6 Test specimen 7 Procedure 8 Assessment of result 9 Test report