... casting, steel fire-resistant, chemical resistant.Abrasives gradeGrit size : 16#,24#,36#,54#,60#80#,100#,120#,150#,180#,220 ... #,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 service ...