... coke guarantee us an annual production of 10000mt of highly pure and dense silicon carbide. The hardness of SiC is between ... metal, non-ferrous metal like copper, brass, aluminum, and magnesium, and non-metallic materials such as gem, optical glass, rock, ... rubber, etc. It is also widely used as refractory material and metallurgical additive. Black Silicon Carbide(C) Black Silicon Carbide Chemical ...