Black silicon carbide is produced at high temperature in an electric resistance type furnace with quarts sand and petroleum coke as its main raw marterials. Its hardness is between fused alumina and synthetic diamond. Mechanical intensity of it is higher than fused alumina. It is brittle and sharp has electrical and heat conductivity in some degree. The abrasives made of it are suitable for working on cast iron, non-ferrous metal, rock, leather, rubber, etc. It is also broadly used as refractory material and metallurgical additive. Chemical Composition (%) --per GB/T2480-1996
Grit Size SiC FC Fe2O3
F12-F90 98.50 <0.20 0.60
F100-F150 98.50 <0.30 0.80
F180-F220 97.00 <0.30 1.20
F230-F400 96.00 <0.40 1.20
F500-F800 95.00 <0.40 1.20
F1000-F1200 93.00 <0.50 1.20
P12-P90 98.50 <0.20 0.60
P100-P150 98.00 <0.30 0.80
P180-P220 97.00 <0.30 1.20
P230-P500 96.00 <0.40 1.20
P600-P1500 95.00 <0.40 1.20
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