... /cm3 min 3.Bulk density 3.7-3.9g/cm3 4.Rigidity HRA 87, 9 (Mohs) min 5.Slenderness ratio 8 ... .8-1.0,1.0-1.2,1.2-1.4,1.4-1.7, 1.5-2.0,2.0-2 ... .5,3,4,5,8,10 or to be customizedCharacteristic as follows 1 ... -50 times better than glass bead in terms of wearability. 4. Higher density than any other grinding bead brings higher grinding efficiency, thus ...