... Calcined Alumina for Ceramic, Refractory , Polishing and Paint Specifications 1. Manufacturer,calcined alumina 2.Al2O3:Generally ... 3.Usage: Ceramic, Refractory , Metallurgical , Grinding, Polishing, Paint etc 1. Ceramic grade category Al2O3 SiO2 Fe2O3 Na2O True ... 0 0.15 0.05 0.1 3.95 g/cm3 4. Paint grade Model No. Al2O3 (Min) SiO2 (Max ... 0.08 0.03 0.05 3.90 g/cm3 Grit size Normal size or Produce according ...