Zinc oxide
Zinc oxide is an inorganic substance with the chemical formula ZnO, an oxide of zinc. It is insoluble in water and soluble in acids and strong bases. Zinc oxide is a commonly used chemical additive and is widely used in the production of plastics, silicate products, synthetic rubber, lubricants, paints and coatings, ointments, adhesives, food, batteries, flame retardants and other products.
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Metal Oxide
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Zinc oxide
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Physical properties：
Appearance and properties: white powder or hexagonal crystals. Odorless and tasteless, no sandiness. Change to yellow when heated, change to white again after cooling and sublimation when heated to 1800℃. Covering power is half that of titanium dioxide and zinc sulfide. Coloring power is 2 times of alkaline lead carbonate.
Solubility: soluble in acid, concentrated hydroxide base, ammonia and ammonium solution, insoluble in water and ethanol.
Chemical properties：
Zinc oxide is a well-known white pigment, commonly known as zinc white. It has the advantage that it does not turn black when encountering H2S gas, because ZnS is also white. When heated, ZnO gradually changes from white and light yellow to lemon yellow, and when cooled the yellow color recedes. Using this property, it is mixed into paints or added to thermometers to make color-changing paints or color-changing thermometers. Because ZnO has astringent and certain bactericidal ability, it is often used as ointment in medicine.
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