Agent Name

Difluorodibromomethane

CAS Number

75-61-6

Formula

C-Br2-F2

Major Category

Solvents

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 fluoriide; TLV Basis = irritation of upper respiratory tract, liver damage, and CNS impairment; [ACGIH] See "CHLOROFLUOROCARBONS."

Restricted

See CHLOROFLUOROCARBONS

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

100 ppm

PEL (OSHA)

100 ppm

IDLH (NIOSH)

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.

Vapor Pressure

820 mm Hg

Lethal Concentration

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

Adverse Effects
Toxic Pneumonitis

Yes

Neurotoxin

CNS Solvent Syndrome

Hepatotoxin

Hepatotoxin, Secondary

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent: