... powder as raw materials, smelting fusde together. It has the color white ,high hardness, low toughness, high purity, excellent ... #,1500#,2000#,2500#,3000#,4000#Refactory grade: 1-0mm,3-1mm,5-3mm,5-8mm-200mesh,-240mesh,-300mesh specificationChemicalcomposition( % )Magneticmeterial content( %) ... 180mesh-200mesh-240mesh-320mesh≥99≤0.1≤0.35≤0.3—colorwhite hardness( mohs )9.0Melting point(°c)2250Maximum ...