... materials, paints, coatings and other fields. Normal size range: Diameter 20mm,25mm,30mm,40mm,50mm,60mm,70mm. Performance Index of Wear ... Absorption Rate(%)≤0.02≤0.02≤0.02≤0.02Bulk Density(g/cm3)≥3.0≥3.2≥3.60≥3.65Wearing Lost(‰)≤0.2≤0.2≤0.15≤0.10 Alumina Grinding Ball for ...