Refractoriness is not less than 1580 ℃ inorganic non-metallic materials. Refractoriness refers to Celsius temperature of refractory conical body sample ,which without load cases, resistance to high temperature and not soften of melting down. Refractory material is widely used in metallurgy, chemical industry, petroleum, machinery manufacturing, silicate, industrial area, such as metallurgical industry, the biggest dosage, Accounts for 50% ~ 60% of total output.