Lecture 1. Material Properties 1. Background
One of the earliest is the Mohs scale, which lists 10 materials (diamond = hardest := 10, and talc = softest := 1). If a material has Mohs hardness = n, then it should be able to put a scratch on all materials below hardness n, and not on any materials above harness n+1. It is usually used
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images.thdstatic.comScratch Hardness – Mohs Scale Ratings The relative hardness of glazed tile is an important issue that should be addressed when selecting a tile. The test is performed by scratching the surface of the tile with different minerals and subjectively assigning a “Mohs Scale of Mineral Hardness” number to the glaze.