... 3.LOI: 0.76% 4.Particle Size: 45um(325mesh) 5.SGS, ISO 98.5% Gamma alumina powder Application:Metallurgy ceramic, refractories, glazing Physical ... , enamel, refractories and other alumina Specification is as following:Al2O3 : 98.5% minSiO2: 0.009%Na2O: 0.44%Particle size: 45um (325 ... mesh)LOI: 0.76%BET surface area: 72 m2/g 98.5% Industry gamma alumina powder