... density; 3. high-strength,grinding, resisting alkali or sour. Corundum refractories ItemsWhite corundumChrome-corundumBrown corundumZR-corundumZR-mulliteYL-corundumAL2O3%90-9845-5085 ... , high-strength,grinding, resisting alkali or sour.UsageWidely used in furnace kilns of metallurgy, chemical engineering,elecstric and glass industry.