Wear-resisting layer is most the hyaline layer of surface layer, the red sapphirine noumenon of its raw material, formal name 3 oxidation 2 aluminium (AL2O3) .
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- 耐磨层为最表层的透明层,其原材料的红蓝宝石本体,学名三氧化二铝(AL2O3)。