Chinese name zinc oxide English name zinc oxide; Zinewhite alias zinc white; Zinc oxide powder molecular formula ZnO appearance and properties white hexagonal crystal or powder, odorless molecular weight 81.37 melting point 1975℃ solubility insoluble in water and ethanol, soluble in acid, sodium hydroxide aqueous solution, ammonium chloride density relative density (water =1)5.66 stable danger mark is mainly used as paint pigment and rubber filler. Zinc oxide used in medicine to make ointment, zinc paste, rubber plaster, etc. is a white or yellowish fine powder, which is easily dispersed in rubber and latex. It is a reinforcing agent, active agent and vulcanizing agent for natural rubber and synthetic rubber, and also a colorant and filler for white rubber compound. After adding active zinc oxide into the compound, the rubber can have good wear resistance, tear resistance and elasticity. It is used for coloring paints, inks and varnished cloth, printing resist agent for printing and dyeing industry, neutralizing the acidity of Niu Pijiao in match industry, and increasing the adhesive effect. The pharmaceutical industry is used as the raw material of rubber plaster, and it is also used for the manufacture of pigments such as zinc chrome yellow, zinc acetate, zinc carbonate, zinc chloride, etc., the catalyst for methanol synthesis, the desulfurizer for synthetic ammonia, and the production of glass and glaze. The fine-grained active zinc oxide (with a particle size of about .1um) can be used as polyolefin and polyvinyl chloride. Zinc oxide is used as white pigment. Because of its good activation performance, active zinc oxide has been widely used in rubber products. For example, in V-belt, it can not only replace ordinary zinc oxide in equal amount, but also reduce the dosage by 1/2-1/3, so that the various performance indexes of rubber are stable, the vulcanization performance is not affected, and the production cost is reduced. Fine zinc oxide can be used as medicine. People pay more and more attention to the application of zinc oxide in cosmetics because of its strong ultraviolet absorption ability. For example, the developed zinc oxide particles with a particle size of .1—.4um have better ultraviolet absorption and transparency than the traditional titanium dioxide particles. The coating made of transparent zinc oxide can effectively prevent the coating from discoloring. This zinc oxide can be used not only as cosmetics, but also as raw materials for automobile paints, furniture and building materials, ink and oil paints, and also as anti-aging agents for rubber and plastics. The recently developed transparent film for food packaging is to coat transparent zinc oxide on polyethylene film, which can not only improve the ultraviolet resistance of plastic film, but also protect the quality of food. With the development of high technology, people are developing and utilizing zinc oxide whisker materials as reinforcing materials for metals and ceramics, materials for ceramic and plastic filter membranes, gas sensing elements, electromagnetic shielding materials and zinc oxide materials with large specific surface area.