1:Al2O3>92% 2:Density>3.60g/cm3 3:Mohs Hardenss:9 degree 4.Wear ... tons Alumina Ceramic Balls have characteristics of high strength, high density, high abrasion, entire specification, strong practicability. It can be used ... Absorption Rate(%)≤0.02≤0.02≤0.02≤0.02Bulk Density(g/cm3)≥3.0≥3.2≥3.60≥3.65Wearing ...