Product Description: The HF series of Tundish Roof is made of high-quality corundum, alumina or mullite and is added composite superfine powder to change the pore size distribution in the material at room temperature to form colloidal after high temperature ceramic combination of high strength and improve refractory structural strength. With good volume stability; good thermal shock resistance and other characteristics, while using the unique design of steel structures, the package cover is not easy deformation but has the insulation effect.