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Chemical Identification
Common Name
Mercuric oxide
中文通用名
氧化汞
IUPAC
mercury(II) oxide
or
mercury(2+) oxide
or
mercuric oxide
CAS
mercury oxide (HgO)
CAS No.
21908-53-2
Molecular Formula
HgO
Molecular Structure
Category
Activity
Fungicide, wound protectant
Physical Properties
Molecular weight:216.6; Physical form:Orange-red to bright red powder (yellow when finely divided). Melting point:Decomposes at c. 500 °C; Solubility:In water 53 mg/l (25 °C). Insoluble in organic solvents. Soluble in dilute acids, forming the corresponding mercury salts.; Stability:Decomposes on exposure to light. Darkens at c. 400 °C and decomposes into mercury and oxygen at c. 500 °C.;
Toxicology
(Rat): Oral LD50 18 mg/kg.Extremely poisonous orally to all animals.
Environmental Profile
Ecotoxicology: 
Fish:Toxic to fish.
Transport Information
Signal Word:DANGER; Hazard Class:Ib(Highly hazardous)

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