NIOSH logo and tagline

Chlorobromomethane

Related Pages
Synonyms & Trade Names
Bromochloromethane, CB, CBM, Fluorocarbon 1011, Halon® 1011, Methyl chlorobromide
CAS No.
74-97-5
RTECS No.
PA5250000
DOT ID & Guide
1887 160
Formula
CH₂BrCl
Conversion
1 ppm = 5.29 mg/m3
IDLH
2000 ppm
See: 74975
Exposure Limits
NIOSH REL
TWA 200 ppm (1050 mg/m3)
OSHA PEL
TWA 200 ppm (1050 mg/m3)
Measurement Methods
NIOSH 1003
See: NMAM or OSHA Methods
Physical Description
Colorless to pale-yellow liquid with a chloroform-like odor. [Note: May be used as a fire extinguishing agent.]
Molecular Weight
129.4
Boiling Point
155°F
Freezing Point
-124°F
Solubility
Insoluble
Vapor Pressure
115 mmHg
Ionization Potential
10.77 eV
Specific Gravity
1.93
Flash Point
NA
Upper Explosive Limit
NA
Lower Explosive Limit
NA
Noncombustible Liquid
Incompatibilities & Reactivities
Chemically-active metals such as calcium, powdered aluminum, zinc & magnesium
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, throat; confusion, dizziness, central nervous system depression; pulmonary edema
Target Organs
Eyes, skin, respiratory system, liver, kidneys, central nervous system
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet or contaminated
Change:No recommendation
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap wash promptly
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH/OSHA

Up to 2000 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode£
(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)£
(APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece

Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus

Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0392
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health