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Product name: zinc oxide
Item/Parameter | Standard | ||||
Zinc Oxide (in accordance with dry materials) % ≥ | ZnO 99.5% | ZnO 99% | ZnO 98% | ZnO 95% | ZnO 90% |
Lead oxide (PbO)% ≤ | 0.12 | 0.2 | 1.0 | 3.0 | 4.0 |
Cadmium oxide (CdO) % ≤ | 0.02 | 0.05 | -- | -- | -- |
Cupric oxide (CuO) % ≤ | 0.006 | -- | -- | -- | -- |
Manganese (Mn) % ≤ | 0.0002 | -- | -- | -- | -- |
Metallic Zinc (in accordance with Zn) % | None | None | -- | -- | -- |
Muriatic Acid Insoluble Substance % ≤ | 0.03 | 0.04 | 0.5 | 0.7 | 2.0 |
Loss On Ignition % ≤ | 0.4 | 0.6 | 0.7 | 1.0 | 5.0 |
Water Soluble Substance % ≤ | 0.4 | 0.6 | 0.7 | 1.0 | 3.0 |
Sieve Residue (45um mesh ) % ≤ | 0.28 | 0.32 | 0.5 | 0.5 | 0.5 |
Volatile % ≤ | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 |
Property: White powder, odourless, relative density 5.606, stable under normal temperature.
Insoluble in water and alcohol, soluble in acid, alkaki and amkonium solution.
Usage: Used in rubber, dope cable, porcelain enamel, oil, pottery and porcelain, glass and other chemical industry.
Packing: In polyethylene film bag with outer polypropylene woven bag, 25kg, 50kg.
Zinc oxide is an inorganic compound with the formula ZnO. It is a white powder that is 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 tires), 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's crust as the mineral zincite, however, most ZnO used commercially is synthetic.
In materials science, ZnO is a wide-bandgap semiconductor of the II-VI semiconductor group (since zinc and oxygen belong to the 2nd and 6th groups of the periodic table, respectively). The native doping of the semiconductor (due to oxygen vacancies) is n-type. This semiconductor has several favorable properties: good transparency, high electron mobility, wide bandgap, strong room-temperature 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 transistors and light-emitting diodes are forthcoming as of 2009.
Applications
The applications of zinc oxide powder are numerous, and the principal ones are summarized below. Most applications exploit the reactivity of the oxide as a precursor to other zinc compounds. For material science applications, zinc oxide has high refractive index, high thermal conductivity, binding, antibacterial and UV-protection properties. Consequently, it is added into various materials and products, including plastics, ceramics, glass, cement, rubber, lubricants, paints, ointments, adhesive, sealants, pigments, foods, batteries, ferrites, fire retardants, etc.
Rubber manufactureAbout 50% of ZnO use is in the rubber industry. Zinc oxide along with stearic acid is used in the vulcanization of rubber. ZnO additive also protect rubber from fungi (see medical applications) and UV light.
Food additiveZinc oxide is added to many food products, e.g., breakfast cereals, as a source of zinc, a necessary nutrient. (Other cereals may contain zinc sulfate for the same purpose.) Some prepackaged foods also include trace amounts of ZnO even if it is not intended as a nutrient.
CoatingsPaints containing zinc oxide powder have long been utilized as anticorrosive coatings for various metals. They are especially effective for galvanised Iron. The latter is difficult to protect because its reactivity with organic coatings leads to brittleness and lack of adhesion. Zinc oxide paints however, retain their flexibility and adherence on such surfaces for many years.
