Zinc Oxide (API)

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