... gradeGrit size : 16#,24#,36#,54#,60#80#,100#,120#,150#,180#,220#Micropowder: 240#,280#,320#,360#,400 ... 1200#,1500#,2000#,2500#,3000#,4000#Refactory grade: 1-0mm,3-1mm,5-3mm,5-8mm-200mesh,-240mesh,-300mesh ... size0-1mm1-3mm3-5mm5-8mm≥99≤0.1≤0.35≤0.3—Fine powder-180mesh-200mesh-240mesh-320mesh≥99 ... ≤0.1≤0.35≤0.3—colorwhite hardness( mohs )9.0Melting point(°c ...