Difluorodibromomethane

Synonyms

Difluorodibromomethane; Fluorocarbon 12-B2; Freon 12-B2; Halon 1202; Methane, dibromodifluoro-; R 12B2; [ChemIDplus] UN1941

Category

Chlorofluorocarbons

Description

Colorless, heavy liquid or gas (above 76 degrees F) with a characteristic odor; [NIOSH]

Sources/Uses

Has been used in fire extinguishers and as a chemical intermediate; [ACGIH]

Comments

Pulmonary damage is noted in animals after a single exposure of 4000 ppm. Decomposition may yield hydrogen bromide and hydrogen fluoride; TLV Basis = irritation of upper respiratory tract, liver damage, and CNS impairment; [ACGIH] See "CHLOROFLUOROCARBONS."

See CHLOROFLUOROCARBONS

Biomedical References

Insufficient data

100 ppm

100 ppm

2000 ppm

Excerpts from Documentation for IDLHs

Other animal data: It has been reported that 4,000 ppm for 15 minutes caused significant pulmonary damage in rats [Chambers et al. 1950]. Fatalities were noted in rats after exposures of to 2,300 ppm for 6 hours/day, 5 days/week for 7 weeks [Comstock et al. 1953]. \ Human data: None relevant for use in determining the revised IDLH.

820 mm Hg

LC50 (mice) = 140,000 mg/m3/2H

Explanatory Notes

VP from HSDB; 2024 Notice of Intended Changes (NIC); [ACGIH TLVs and BEIs]

Yes

Acute solvent syndrome

Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion

Diseases

Occupational diseases associated with exposure to this agent:

• Solvents, acute toxic effect