Be the same as when SiC when other and fireproof raw material is complex, what can make a lot of kinds again is compoundFireproof material, and have extensive use. In indeterminate form in fireproof material, because contain the indeterminate form of SiC the thermal conductance of fireproof material is tall, linear expansion coefficient is small, and have the low alkalinity such as sex of tall wear-resisting caustic and slag of almost different blast furnace the character such as slaggy reaction, consequently, contain SiC indeterminate form fireproof material applies already extensively at the industrial domain such as industry of incinerator of iron and steel industry, rubbish, cement, heat and power plant, have the superior performance that fireproof material cannot replace other and indeterminate form.