Usage areas of Zinc Oxide
Zinc oxide is an inorganic compound with the formula ZnO. ZnO is a water-insoluble, white powder and is widely used as an additive to numerous substances and products, including paints, ointments, adhesives, sealants, pigments, rubber, plastics, ceramics, glass, cement, lubricants, foods, batteries, ferrites, fire retardants, and first aid tapes. Although it occurs naturally in the mineral zincite, most zinc oxide is produced synthetically.
Pure ZnO is a white powder, but naturally the rare mineral zincite and often contains manganese and other impurities that add a yellow to red color.
Zinc oxide is an amphoteric oxide. It is almost insoluble in water, but dissolves in most acids such as hydrochloric acid:
ZnO + 2 HCI → ZnCl 2 + H 2 O
Appearance: Odorless white powder.
Chemical Name : White zinc, calamine
Chemical Formula: ZnO
Features : It is available in two types as white and golden seals. The gold seal is of pharmaceutical quality.
Packaging Type: 50 kg. in bags
Solid zinc oxide also dissolves in alkalis to give soluble zincate:
ZnO + 2 NaOH + H 2 Na → O 2 [Zn (OH) 4]
ZnO reacts slowly with fatty acids in oils to produce corresponding carboxylates such as oleate or stearate. When mixed with a strong aqueous solution of zinc chloride, ZnO forms cement-like products, which are best described as zinc hydroxy chloride.  This cement was used in dentistry.
ZnO also forms a cement-like material when treated with phosphoric acid; related materials are used in dentistry. An important component of the zinc phosphate glue produced by this reaction is Hopeit, Zn 3 (PO 4) 2 4H 2 O
ZnO decomposes into zinc vapor and oxygen around 1975°C with standard oxygen pressure. In a carbothermic reaction, heating with carbon converts the oxide to zinc vapor at a much lower temperature (about 950 °C).
ZnO + C → Zn (Buhar) + CO
May react violently with zinc oxide, aluminum and magnesium powders; Chlorinated rubber and linseed oil in heating can cause fire and explosion hazard.
It reacts with hydrogen sulfide to give zinc sulfide. This reaction is used commercially.
- It is used as a white pigment in watercolors in the paint industry. In addition to being a white pigment, it is a chemically reactive substance and has a thickening feature. It protects the paint from ultra violet light, delays its fading, adds hardness to the paint layer, and has an anti-mildew effect.
- It increases the resistance against thermal and mechanical shocks and the brightness of the material in the ceramic and glass industry. It improves the optical properties of glass.
- In the textile industry, it acts as a filling material, gives whiteness and durability to the material it is used, gives elasticity, and creates an effect against mold and bacteria.
- It is used in the metal coating industry, in the coating of various metal surfaces and in the protection against corrosion, and in the surface coating of electrical household appliances because it increases the electrical resistance.
- It is used in making matches, accumulators, batteries, and chemical smoke.
- It is used as an activator in the tire industry. It is used as an accelerator in the vulcanization of tires. By increasing the flexibility of the tire, it provides resistance against abrasion and tearing.
- 7. In the pharmaceutical and cosmetic industry, it helps cell regeneration with its antiseptic and drying properties. It is in the composition of some over-the-counter ointments and when applied as a thin layer, it prevents the skin from losing water. It protects against sunburn in summer and cold burns in winter.
- Redness on the skin can be prevented by using a very small amount on the diaper-bound areas of babies.
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