White Fused Alumina Introduction White Fused Alumina (white corundum) is produced by the grinding & classification of selected Macro grain feed stock in an advanced milling and classifying facility. This ensures an iron free product of narrow particle size distribution and high whiteness. White Fused Alumina Physics Properties Color White Crystal form Triangal crystal system Mohs hardness 9.0-9.5 Micro hardness 2000-2200 kg/mm�² Melting point 2250 Maximum operating temperature 1900 True density 3.90 g/cm�³ Bulk density 1.5-1.99 g/cm�³ White Fused Alumina Chemical Position Standards Code and Size Range Chemical Composition% AI2O3 SiO2 Fe2O3 Na2O F90-F150 99.50 0.10 0.05 0.30 F180-F220 99.50 0.10 0.05 0.30 #240-#3000 99.50 0.10 0.05 0.30 #4000-#12500 99.50 0.10 0.05 0.30