| Agent Name |
Difluorodibromomethane |
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| CAS Number |
75-61-6 |
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| Formula |
C-Br2-F2 |
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| Major Category |
Solvents |
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| Synonyms |
Difluorodibromomethane; Fluorocarbon 12-B2; Freon 12-B2; Halon 1202; Methane, dibromodifluoro-; R 12B2; [ChemIDplus] UN1941 |
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| Category |
Chlorofluorocarbons |
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| Description |
Colorless, heavy liquid or gas (above 76 degrees F) with a characteristic odor; [NIOSH] |
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| Sources/Uses |
Has been used in fire extinguishers and as a chemical intermediate; [ACGIH] |
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| Comments |
Pulmonary damage is noted in animals after a single exposure of 4000 ppm. Decomposition may yield hydrogen bromide and hydrogen fluoriide; [ACGIH] Induces respiratory tract irritation and CNS depression at concentrations >70,000 ppm; [CHEMINFO] See "CHLOROFLUOROCARBONS." |
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| Restricted |
See CHLOROFLUOROCARBONS |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
No |
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| TLV (ACGIH) |
100 ppm |
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| PEL (OSHA) |
100 ppm |
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| IDLH (NIOSH) |
2000 ppm |
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| 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. |
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| Vapor Pressure |
820 mm Hg |
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| Lethal Concentration |
LC50 (mice) = 140,000 mg/m3/2H |
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| Adverse Effects |
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| Toxic Pneumonitis |
Yes |
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| Neurotoxin |
CNS Solvent Syndrome |
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| Hepatotoxin |
Hepatotoxin, Secondary |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: DIBROMODIFLUOROMETHANE
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