... price and prompt delivery after more than ten years development.High purity ultra-fine alumina is a kind of white odorless powder ... precision polishing materials, filler, catalyst support, desiccant, adsorbent, depurant, high pressure sodium lamps, etc.Physical properties:ItemCrystalAL2O3(%)≥D50(μm)Specific ... interested in our products, feel free to contact us. High-purity ultra-fine alumina powder