Zinc Oxide

Product: Zinc Oxide

 

Other names: Zinc white, Calamine

 

Molecular Formula: ZnO

 

CAS number: 1314-13-2

 

Appearance: white solid

 

Safety:

As a food additive, zinc oxide is on the U.S. FDA’s generally recognized as safe, or GRAS,

substances.

Zinc oxide itself is non-toxic; however it is hazardous to breathe zinc oxide fumes, as generated when zinc or zinc alloys are melted and oxidized at high temperature. This problem occurs while melting brass because the melting point of brass is close to the boiling point of zinc.

Exposure to zinc oxide in the air, which also occurs while welding galvanized (zinc plated) steel,

can result in a nervous malady called metal fume fever. For this reason, typically galvanized steel is not welded, or the zinc is removed first.

 

Brief introduction:

Zinc oxide is an inorganic compound with the formula ZnO. It usually appears as a white powder,

nearly insoluble in water. The powder is widely used as an additive into numerous materials and

products including plastics, ceramics, glass, cement, rubber (e.g. car tyres), lubricants, paints,

ointments, adhesives, sealants, pigments, foods (source of Zn nutrient), batteries, ferrites, fire

retardants, first aid tapes, etc. ZnO is present in the Earth crust as a mineral zincite; however, most ZnO used commercially is produced synthetically.

In materials science, ZnO is often called a II-VI semiconductor because zinc and oxygen belong to the 2nd and 6th groups of the periodic table, respectively. This semiconductor has several favorable properties: good transparency, high electron mobility, wide bandgap, strong roomtemperature luminescence, etc. Those properties are already used in emerging applications for transparent electrodes in liquid crystal displays and in energy-saving or heat-protecting windows, and electronic applications of ZnO as thin-film transistor and light-emitting diode are forthcoming as of 2009.

 

 

Resource:

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<a href="http://www.ecvv.com">www.ecvv.com</a> is an innovative and comprehensive business portal in China, dedicated to saving costs for Chinese SMEs to find buyers and export to overseas markets.