... Dry Powder & Granules 2) Purity:99.7% & 99.5% 3) Use: Rubber,Food , Chemicals... 4) Packing: 25kg 5) ISO9001 Zinc oxide (ZnO), commonly known ... outcome of zinc by oxidation. Insoluble in water, soluble in acid and alkali. Zinc oxide as chemical additives is usually and ... or light yellow powder, density 5.606, melting point 1975 °, is an amphoteric oxide, soluble in acid and alkali, insoluble in water ...