High purity alumina AHP20 Typical Properties Na (ppm) 20 Fe (ppm) 3 Si (ppm) 8 Ca (ppm) 1 Mg (ppm) 1 Al2O3 (%) 99.99 Particle Size (μm) 30 α-Crystal Size (μm) 0.2~0.4 BET (m2/g) 4.5 Bulk Density ( Loose ) (g/cm3) 0.7