CHLOROBROMOMETHANE†

Chemical Identification
Chemical Identification
CAS # 74-97-5
Formula

CH₂BrCl

Synonyms

bromochloromethane; methylene chlorobromide; methylene bromochloride; mono-chloro-mono-bromo-methane; chloromethylbromide; CB; CBM; Halon 1011

Physical Properties
Physical Properties
Physical description Colorless to pale-yellow liquid with a chloroform-like odor.
Boiling point 155°F Molecular weight 129.4
Freezing point/melting point -124°F Vapor pressure 115 mmHg
Flash point Vapor density 4.46
Specific gravity 1.93 Ionization potential 10.77 eV
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 0627
Sampling group
Sampler/Sampling media CSC tube (100/50 mg) [SKC 226-01]
Sampling time*

480 min

Sampling volume (TWA)*

60 L

Sampling flow rate (TWA)*

0.01-0.2 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments GC-ECD
Method reference NIOSH 1003 (partially validated)
Notes
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device Detector tube Detector tube Infrared spectrophotometer Infrared spectrophotometer
Model/Type Gastec 136L; 136H; 136L Gastec 135 Miran 1A Miran 103
Sampling information
(see manufacturer instructions)
136LA 1-36 ppm; 136H 10-600 ppm; 136L 2.5-200 ppm 20-350 ppm range 0.7 ppm@8.4µm 0-400 ppm@8.1µm
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA

200 ppm (1050 mg/m³)

REL-TWA

200 ppm (1050 mg/m³)

TLV-TWA

200 ppm [2008]

PEL-TWA

200 ppm (1050 mg/m³)

PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C REL-C TLV-C PEL-C
Skin notation

N

Skin notation

N

Skin notation

N

Skin notation

N

Notes:

See 29 CFR 1910.1000 Table Z-1.

Notes: Notes: Notes:
Health factors:  See NIH-NLM PubChem. IDLH

2000 ppm

Carcinogenic classifications: EPA-D Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Bromochloromethane

NIOSH: Pocket Guide to Chemical Hazards - Chlorobromomethane

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Chlorobromomethane. See annual publication for most recent information.
  • NIOSH: Occupational Health Guideline for Chlorobromomethane. 1978.

Last Updated Date : 12/21/2020