... :215-222-5 5.Density: 5.606 High-purity and Ultra-fine Zinc OxideAppearance: white or light yellow Powder Melting Point: 1975 ... °CPhysical Properties:White hexagonal system crystalloid or powder, tasteless, nontoxic, fine particle. It is amphoteric oxide, soluble in acid, NaOH, NH4CL ... , it can go on to be used. High-purity and Ultra-fine Zinc Oxide