... materials, smelting fusde together. It has the color white ,high hardness, low toughness, high purity, excellent ... 2000#,2500#,3000#,4000#Refactory grade: 1-0mm,3-1mm,5-3mm,5-8mm-200mesh,-240mesh,-300mesh specificationChemicalcomposition( % )Magneticmeterial ... 3—colorwhite hardness( mohs )9.0Melting point(°c)2250Maximum service temperature(°c)1900Ture density (g/cm)3.9 White Fused Alumina0-1-3-5 ...