1Al2O3 99% 2NAO 0.3% 3Fe2O3 0.1% 4Hardness(mohs) 9 5 Ture density 3. ... (WA)Al2O3 99.53%...........NaO 0.3%.........Fe2O3 0.1%......... Magnetic material content 0.0023%.....color white ……hardness( ... 150#,180#,220#Micropowder:240#,280#,320#,360#,400#,500#,600#,800#,1000#,1200#,1500# 2000#,2500#,3000#,4000#Refractory grade:1-0mm ... cooperation with us.. Refractory White Fused Alumina 1-0mm.3-1mm.5-3mm