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Zinc oxide is an inorganic compound with the formula Zn O.It is a white powder which is insoluble in water. ZnO is used as an additive in numerous materials and products including cosmetics, food supplements, rubbers, plastics, ceramics, glass, cement, lubricants, [12] paints, sunscreens, ointments, adhesives, sealants, pigments, foods, batteries, ferrites, fire retardants, semi conductors ...
Zinc oxide is used to protect rubber polymers and plastics from ultraviolet radiation (UV). [125] The semiconductor properties of zinc oxide make it useful in varistors and photocopying products. [144] The zinc zinc-oxide cycle is a two step thermochemical process based on zinc and zinc oxide for hydrogen production. [145]
The name became synonymous with zinc oxide [6] and with rolled zinc, especially for building applications. The company was the world's oldest and also largest zinc producer, producing at its peak at least 149,000 tonnes per year. [7] In 1989 Vieille Montagne was merged into the Union Minière group, based in Belgium, which became Umicore in ...
In India, zinc was produced at Zawar from the 12th to the 18th centuries, although some zinc artifacts appear to have been made during classical antiquity in Europe. [12] The sphalerite ore found here was presumably converted to zinc oxide via roasting, although no archaeological evidence of this has been found.
Zinc melts at 420 °C (787 °F), [21] but importantly boils at 907 °C (1665 °F), a temperature below the melting point of silver. Consequently, at the temperatures needed to reduce zinc oxide to the metal, the metal is already gaseous. [23] [24] Arsenic sublimes at 615 °C (1137 °F), passing directly from the solid state to the gaseous state ...
An early example of zinc white's use in painting [1]: 183 Zinc white is an inorganic pigment composed of zinc oxide that has been used by painters since the late eighteenth century. [1] Alongside lead and titanium white, it is among the three most prominent white pigments that are commercially available today. [1]
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Calamine is a combination of zinc oxide and 0.5% ferric oxide (Fe 2 O 3). [6] The lotion is produced with additional ingredients such as phenol and calcium hydroxide. [6] [7] The use of calamine lotion dates back as far as 1500 BC. [8] It is on the World Health Organization's List of Essential Medicines. [9]