... Calcined Alumina for Ceramic, Refractory , Polishing and Paint Specifications 1. Manufacturer,calcined alumina 2. ... Usage: Ceramic, Refractory , Metallurgical , Grinding, Polishing, Paint etc 1. Ceramic grade category Al2O3 SiO2 Fe2O3 Na2O ... 1 MT BAG OR AS REQUEST 3. Refractory and Metallurgical grade Category Al2O3 SiO2 Fe2O3 Na2O True ... 0.05 0.1 3.95 g/cm3 4. Paint grade Model No. Al2O3 (Min) SiO2 (Max) ...