actived alumina powder 1.Refractory materials,alpha-alumina,active aluminum 2.For poshing,cutting, ... -R1Al2O3,99.00minSiO2, 0.15maxFe2O3,0.40maxNa2O,0.20max 3.95 95 1BH-R23.94951-2BH-R33.93952-3 Calcined Alumina,(ceramics ... -2Our company products divide these part :BrandSizeCalcined AluminaAlpha-Al2O30.5,1,2,3,5,um, 800,500,325meshActive Alumina2,3,4um ...