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Chemical Sampling Information (CSI)
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General Description

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

OSHA IMIS Code Number: 0627

Chemical Abstracts Service (CAS) Registry Number: 74-97-5

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: PA5250000

Department of Transportation Regulation Number (49 CFR 172.101) and 2012 Emergency Response Guidebook [4 MB PDF, 392 pages]: 1887 160

NIOSH Pocket Guide to Chemical Hazards - Chlorobromomethane: Physical description, chemical properties, potentially hazardous incompatibilities, and more



Exposure Limits and Health Effects

Exposure Limit

Limit Values

HE Codes

Health Factors and Target Organs

OSHA Permissible Exposure Limit (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

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL)

200 ppm
(1,050 mg/m3)
TWA

HE8

Central nervous system effects (mental confusion, dizziness, unconsciousness)
HE15 Eye, throat, and skin irritation

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV) (2009)

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 PEL

200 ppm
(1,050 mg/m3)
TWA

HE8

 Central nervous system depression (severe headache, loss of consciousness, gastric upset, weight loss, slow recovery)

National Toxicology Program (NTP) carcinogenic classification: Not listed

International Agency for Research on Cancer (IARC) carcinogenic classification: Not listed

U.S. Environmental Protection Agency (EPA) carcinogenic classification: Not classifiable as to human carcinogenicity

EPA Inhalation Reference Concentration (RfC): Not established

Agency for Toxic Substances and Disease Registry (ATSDR) Inhalation Minimal Risk Level (MRL): Not established

NIOSH Immediately Dangerous to Life or Health (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.

Date Last Revised: 09/06/2012

Literature Basis

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Chlorobromomethane. 2009.
  • NIOSH: Occupational Health Guideline for Chlorobromomethane. 1978.
  • NIOSH/IPCS: International Chemical Safety Cards - Bromochloromethane. 1995.
Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Charcoal Tube (100/50 mg sections, 20/40 mesh)
    analytical solvent: Carbon Disulfide
    maximum volume: 5 Liters
    maximum flow rate: 0.2 L/min
    current analytical method: Gas Chromatography; GC/ECD
    method reference: 1 (NIOSH 1003)
    sampling and analytical error: 0.10
    method classification: Partially Validated

Secondary Laboratory Sampling/Analytical Method (SAM2):

  • device: Detector Tube
    company: Gastec
    part #: 136
    range: 8-80 ppm
    class: Mfg
  • device: Detector Tube
    company: Gastec
    part #: 135
    range: 20-350 ppm
    class: Mfg
  • device: Detector Tube
    company: MSA
    part #: 85834
    range: 50-400 ppm
    class: SEI certified
  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A
    range: 0.7 ppm @ 8.4 um
    class: Mfg
  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 103
    range: 0-400 ppm @ 8.1 um
    class: Mfg

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