... tough, strong aluminum oxide is required.Applications:AETL is used for making vitrified bonded grinding wheels. The tough, strong aluminum oxide characteristic ... 20, 22, 24, 30, 36, 40, 46, 54, 60, 70, 80, 90, 100, 120, 150, 180, 220.Bulk Density: Grit(F ... 7120 1.91 – 2.05 40 1.78 – 1.91 80 1.68 – 1.82 180 1.55 – 1.7022 ... 46 1.76 – 1.90 90 1.66 – 1.80 220 1.54 – 1.68Grain Size Distribution :Upon ANSI B74 ...