... precision casting, steel fire-resistant, chemical resistant.Abrasives gradeGrit size : 16#,24#,36#,54#,60#80#,100#,120#,150#,180#,220 ... ≥99≤0.05≤0.26≤0.08≤0.002390-150≥99≤0.06≤0.28≤0.09≤0.0021180-220≥99≤0.08≤0.30≤0.10≤0.0018micropowder240-4000≥98.5≤0.1≤0.4≤0 ... .15—Refactory gradeGroup size0-1mm1-3mm3-5mm5-8mm≥99≤0.1≤0 ...