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Chemical Identification
Common Name
Formaldehyde
中文通用名
甲醛
IUPAC
formaldehyde
CAS
formaldehyde
CAS No.
50-00-0
Molecular Formula
CH2O
Molecular Structure
Physical Properties
Molecular weight:30.0; Physical form:Colourless, flammable gas, with a pungent odour. Formalin is a colourless liquid, with a pungent odour. Density:0.815 (-20 °C); 1.081-1.085 (25 °C, formalin); Melting point:-92 °C; Flash point:Flammable; Solubility:In water 55%. Miscible with acetone, alcohols, and ethers. Formalin miscible with water, acetone, ethanol.; Stability:Highly chemically-reactive. Polymerised in aqueous solution to trioxymethylene (retarded by the addition of methanol). Sensitive to light. Powerful reducing agent.;
Toxicology
Oral:Acute oral LD50 for rats 550-800 mg/ kg (formalin). Percutaneous:Acute percutaneous LD50 for rabbits 270 mg/ kg (formalin). Absorbed through the skin. Inhalation: LC50 for rats (0.5 h) 0.82 mg/l, (4 h) 0.48 mg/l; for mice (4 h) 0.414 mg/l; formaldehyde vapour is very irritating to the mucous membranes and toxic to animals, including man. Phytotoxicity:Extremely phytotoxic.
Environmental Profile
Ecotoxicology: F
ish:Toxic to fish. 

Environmental fate: 
Soil:In the presence of air, formaldehyde is oxidised to formic acid.
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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