... main raw marterials .Its hardness is between fused alumina and synthetic diamond.Mechanical intensity of it is higher than fused alumina .It ... #,36#,46#,54#,60#,80#,100#,120#,150#,180#,220#Micropowder:240#,280#,320#,360#,400#,500#,600#,800#,1000#,1200 ... %Crystal system HexagonalColor BlackMicro Hardness HV3100-3280Grinding ability(compared with diamond as one) 0.25Hardness(mohs) 9.15Ture density 3.12 ...