... , small coefficient of expansion, brittle property and good thermal conductivity 2.ISO9001:2008 quality system PropertiesBlack silicon carbide is a nonmetallic ... by high hardness, small coefficient of expansion, brittle property and good thermal conductivity, widely used as a ... .01.5Sand90.02.01.5Note: Silicon carbide sand and powder for deoxidization of steelmaking in specification of 50, 60, 70, 80 ...