Abrasive Alumina ball: 1.size:20mm,25mm,30mm,40mm,50mm,60mm,70mm 2. ... than the common ceramic balls’. When it is working, the ball will not pollute the grinded materials, so it can keep ... ) Abrasion loss(%)95 series95≥3.67≤0.029.5≤0.06 The standard specification of alumina grinding balls Diameter(mm)φ25 ...