# NIOSH Pocket Guide to Chemical Hazards
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 | 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
Personal Protection & Sanitation 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
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