Specification: SiO2 (%): 53.7%min Al2O3 (%): 44.97% max Fe2O3 (%): 0.25% max TiO2 (%): 0.20% max CaO (%): 0.30% max MgO(%): 0.15% max K2O (%): 0.04% max Na2O(%): 0.13% max Whiteness: 92%