refractory grade Alumina powder(99%min) 1.ball grain,good liquidity,granularity, stablequality 2,for ceramics, ... refrac refractory grade Alumina powder(99%min)1ball grain,good liquidity,granularity, stablequality 2,for ceramics, refractories ... a specific finish. Al2O3 %a-Al2O3 %SiO2 %Fe2O3 %Na2O %L.O.I %True Specific Gravityg/cm3≥99≥96.0≤0.06 ...