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Stereo, skeletal formula of bromochloromethane with all explicit hydrogens added
Spacefill model of bromochloromethane
CAS number 74-97-5 YesY
PubChem 6333
ChemSpider 6093 YesY
EC number 200-826-3
UN number 1887
KEGG C02661 YesY
MeSH bromochloromethane
ChEBI CHEBI:17194 YesY
RTECS number PA5250000
Beilstein Reference 1730801
Gmelin Reference 25577
3DMet B00481
Jmol-3D images Image 1
Molecular formula CH2BrCl
Molar mass 129.38 g mol−1
Appearance Colorless liquid
Density 1.991 g mL−1
Melting point −88.0 °C; −126.3 °F; 185.2 K
Boiling point 68 °C; 154 °F; 341 K
Solubility in water 16.7 g L−1
log P 1.55
Vapor pressure 15.60 kPa (at 20.0 °C)
Refractive index (nD) 1.482
GHS pictograms The corrosion pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) The exclamation-mark pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word DANGER
GHS hazard statements H315, H318, H332, H335
GHS precautionary statements P261, P280, P305+351+338
EU classification Irritant Xi Dangerous for the Environment (Nature) N
R-phrases R37/38, R41, R59
S-phrases S26, S39
  • 5 g mol−1 (oral, rat)
  • 20 g kg−1 (dermal, rabbit)
Related compounds
Related alkanes
Related compounds 2-Chloroethanol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Bromochloromethane or methylene bromochloride and Halon 1011 is a mixed halomethane. It is a heavy low-viscosity liquid with refractive index 1.4808.

It was invented for use in fire extinguishers by the Germans during the mid-40s, in an attempt to create a less-toxic, more effective alternative to carbon tetrachloride. This was a concern in aircraft and tanks as carbon tetrachloride produced highly toxic by-products when discharged onto a fire. CBM was slightly less toxic, and used up until the late 1960s, being officially banned by the NFPA for use in fire extinguishers in 1969, as safer and more effective agents such as halon 1211 and 1301 were developed. Due to its ozone depletion potential its production was banned from January 1, 2002, at the Eleventh Meeting of the Parties for the Montreal Protocol on Substances that Deplete the Ozone Layer.

A 1950s US CBM fire extinguisher.

It can be biologically decomposed using hydrolase enzyme alkylhalidase by the reaction:

CH2BrCl (l) + H2O (l) → CH2O (l) + Br2 (l) + Cl2 (g)

In fiction[edit]

In the Enter the Matrix video game, the player can find a "Chloro-Bromo Methane Gun", which is used as a fire extinguisher. It fires a pressurized cartridge of CBM gas to put out fires. However, due to its chemical properties, firing a cartridge near people causes their lungs to fill with liquid, effectively drowning them.


  1. ^ "bromochloromethane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 16 September 2004. Identification. Retrieved 24 June 2012. 

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