Molecular formula: ZnO
Molecular weight: 81.38
Appearance: White powder
Properties: Specific gravity: 5.606; melting point: 1975 ℃. It is a amphoteric oxide that is soluble in acids and bases but insoluble in water and ethanol, and sublimates when heated to 1800 ℃.
Usage: Zinc oxide has certain astringent and anti-inflammatory effects, as well as moisturizing, protective and drying effects on the skin. Often compounded with sulfur, boric acid, ichthammol, sulfonamide, salicylic acid, cod liver oil, etc., it is used for the treatment of dermatitis, eczema, folliculitis, boils, burns, scalds, etc. At the same time, zinc oxide is also a trace nutrient element required by the human body, which can promote immune function, increase human immunity, enhance the body's disease resistance, and prevent various diseases.
Common preparations: tablets, ointments, oils, lotions, gel, etc.
Item | Registration standards for APIs | Chinese Pharmacopoeia（Ch.P.） | British Pharmacopoeia（BP） | United States Pharmacopeia（USP） | European Pharmacopoeia（EP） |
Content | ≥99.0% | ≥99.0% | 99.0-100.5% | 98.0-102.0% | 99.0-100.5% |
Basicity | Shall comply with regulations | Shall comply with regulations | Shall comply with regulations | Shall comply with regulations | Shall comply with regulations |
Loss on ignition | ≤1.0% | ≤1.0% | ≤1.0% | ≤1.0% | ≤1.0% |
Sulfate | ≤0.005% | ≤0.005% | — | — | — |
Substances insoluble in carbonate and acid | Shall comply with regulations | Shall comply with regulations | Shall comply with regulations | Shall comply with regulations | Shall comply with regulations |
Ferric salt | ≤50PPm | ≤50PPm | ≤200PPm | Shall comply with regulations | ≤200ppm |
Lead salt | Shall comply with regulations | Shall comply with regulations | ≤50PPm | Shall comply with regulations | ≤10PPm |
Arsenic salt | ≤2PPm | ≤2PPm | ≤5PPm | ≤6PPm | ≤6PPm |
Cadmium salt | ≤10PPm | — | ≤10PPm | — | ≤5PPm |
Thallium | — | — | — | — | ≤5PPm |
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