... zinc by oxidation. Insoluble in water, soluble in acid and alkali. Zinc oxide as chemical additives is usually and widely used in plastic, silicate products ... , density 5.606, melting point 1975 °, is an amphoteric oxide, soluble in acid and alkali, insoluble in water or ethanol. High temperature, yellow ... )USES: Rubber/tyre, pharmacy, Glass, cement, Food, electronic, zinc oxide used in ceramic grade