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Chlorobromomethane

General Description

Synonyms: Bromochloromethane; Methylene chlorobromide; Methylene bromochloride; Mono-chloro-mono-bromo-methane; Chloromethylbromide; CB; CBM; Halon 1011

OSHA IMIS code: 0627

CAS number: 74-97-5

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method:
  • charcoal tube (100/50 mg sections, 20/40 mesh)
  • maximum volume: 5 L
  • maximum flow rate: 0.2 L/min
  • current analytical method: gas chromatography; GC/ECD
  • analytical solvent: carbon disulfide
  • method reference: NIOSH 1003 (partiallly validated)
  • sampling and analytical error: 0.10
Secondary Laboratory Sampling/Analytical Method (SAM2):
  • part #: 136
  • range: 8-80 ppm
  • class: Mfg
  • part #: 135
  • range: 20-350 ppm
  • class: Mfg
  • part #: 85834
  • range: 50-400 ppm
  • class: SEI certified
  • part #: MIRAN 1A
  • range: 0.7 ppm @ 8.4 um
  • class: Mfg
  • part #: MIRAN 103
  • range: 0-400 ppm @ 8.1 um 
  • class: Mfg

Exposure Limits and Health Effects (Updated September 6, 2012)

Standard Set By Exposure Limit Health Effect Codes -- Health Effects and Target Organs

OSHA PEL - General Industry
See 29 CFR 1910.1000 Table Z-1

200 ppm (1,050 mg/m3) TWA HE8 -- narcotic effects
OSHA PEL - Construction Industry
See 29 CFR 1926.55 Appendix A
200 ppm (1,050 mg/m3) TWA HE8 -- narcotic effects
OSHA PEL - Shipyard Employment
See 29 CFR 1915.1000 Table Z-Shipyards
200 ppm (1,050 mg/m3) TWA HE8 -- narcotic effects
NIOSH REL 200 ppm (1,050 mg/m3) TWA HE8 -- central nervous system effects (mental confusion, dizziness, unconsciousness)
HE15 -- eye, throat, and skin irritation
ACGIH TLV® (2008) 200 ppm (1,060 mg/m3) TWA HE8 -- central nervous system depression (severe headache, loss of consciousness, gastric upset, weight loss, slow recovery)
CAL/OSHA PELs 200 ppm (1,050 mg/m3) TWA HE8 -- central nervous system depression (severe headache, loss of consciousness, gastric upset, weight loss, slow recovery)

Carcinogenic classification:

EPA Inhalation Reference Concentration (RfC): Not established

ATSDR Inhalation Minimal Risk Levels (MRLs): Not established

NIOSH IDLH concentration: 2,000 ppm

Notes on other potential health effects and hazards:

No other potential health effects or hazards resulting from occupational exposure were found in the scientific literature.

Partial reference list:

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Chlorobromomethane. 2016.
  • NIOSH: Occupational Health Guideline for Chlorobromomethane. 1978.
  • NIOSH/CEC/IPCS: International Chemical Safety CardsBromochloromethane. 1995.

Chemical Sampling Information

By Name

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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