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الشخص الذي يمكن الاتصال به Mr. bruce
dukang south road, yichuan, luoyang
Brown corundum is fused in an electric-furnace by high temperature .Its main raw materials are bauxite, anthracite. It displays brown. Its chemical composition contains AL2O3, a small amount of SIO2, TIO2 and FE2O3, etc.
