Zinc Oxide (ZnO)
Zinc Oxide, also known as: zinc oxide powder, zinc white, zinc white powder, active zinc oxide
Status: white crystal or powder
Packing method: 25KG / bag
Applications: used in the production of plastic, silicate products, synthetic rubber, lubricating oil, paint and coating, ointment, adhesive, food, battery, flame retardant and other products.
Physical property
Appearance and properties: white powder or hexagonal crystal, odorless, tasteless and sandless. When heated, it turns yellow, then turns white again after cooling, and sublimates when heated to 1800 ℃. The covering power is half that of titanium dioxide and zinc sulfide. The coloring power is twice that of basic lead carbonate.
Solubility: soluble in acid, concentrated hydroxide base, ammonia water and ammonium salt solution, insoluble in water and ethanol.
Chemical property
Zinc oxide is a famous white pigment, commonly known as zinc white. Its advantage is that it will not be black when encountering H2S gas, because ZnS is also white. When heated, ZnO gradually changes from white and light yellow to lemon yellow. When cooled, the yellow color will fade away. Using this feature, it can be mixed into paint or added into thermometer to make discolored paint or discolored thermometer. Because ZnO has convergence and a certain bactericidal ability, it is often used as ointment in medicine, and ZnO can also be used as catalyst.
Chemical reaction formula:
Reaction with NaOH: ZnO + 2NaOH + H2O = Na2 [Zn (OH) 4]