NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Chlorobromomethane

CAS
74-97-5

CH2BrCl

RTECS
PA5250000
Synonyms & Trade Names

Bromochloromethane; CB; CBM; Fluorocarbon 1011; Halon® 1011; Methyl chlorobromide
DOT ID & Guide
1887 / 160

Exposure
Limits

NIOSH REL: TWA 200 ppm (1050 mg/m3)
OSHA PEL: TWA 200 ppm (1050 mg/m3)
IDLH
2000 ppm See: 74975
Conversion
1 ppm = 5.29 mg/m3
Physical Description
Colorless to pale-yellow liquid with a chloroform-like odor. [Note: May be used as a fire extinguishing agent.]
MW: 129.4
BP: 155°F
FRZ: -124°F
Sol: Insoluble
VP: 115 mmHg
IP: 10.77 eV

Sp.Gr: 1.93
Fl.P: NA
UEL: NA
LEL: NA

Noncombustible Liquid
Incompatibilities & Reactivities

Chemically-active metals such as calcium, powdered aluminum, zinc & magnesium
Measurement Methods
NIOSH 1003
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
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
See also: INTRODUCTION   See ICSC CARD: 0392