# NIOSH Pocket Guide to Chemical Hazards
Bromine | CAS 7726-95-6
Br2 | RTECS EF9100000
Synonyms & Trade Names Molecular bromine | DOT ID & Guide 1744 154
Exposure Limits | NIOSH REL: TWA 0.1 ppm (0.7 mg/m3) ST 0.3 ppm (2 mg/m3)
OSHA PEL†: TWA 0.1 ppm (0.7 mg/m3)
IDLH 3 ppm | Conversion 1 ppm = 6.54 mg/m3
Physical Description Dark reddish-brown, fuming liquid with suffocating, irritating fumes.
MW: 159.8 | BP: 139°F | FRZ: 19°F | Sol: 4%
VP: 172 mmHg | IP: 10.55 eV |  | Sp.Gr: 3.12
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Liquid, but accelerates the burning of combustibles.
Incompatibilities & Reactivities Combustible organics (sawdust, wood, cotton, straw, etc.), aluminum, readily oxidizable materials, ammonia, hydrogen, acetylene, phosphorus, potassium, sodium [Note: Corrodes iron, steel, stainless steel & copper.]
Measurement Methods NIOSH 6011; OSHA ID108
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 2.5 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode£/(APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern¿£ Up to 3 ppm: (APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern¿/(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern¿/(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and cartridge(s) providing protection against the compound of concern¿£/(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 canister providing protection against the compound of concern¿/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Dizziness, headache; lacrimation (discharge of tears), epistaxis (nosebleed); cough, feeling of oppression, pulmonary edema, pneumonitis; abdominal pain, diarrhea; measle-like eruptions; eye, skin burns
Target Organs respiratory system, eyes, central nervous system, skin
See also: INTRODUCTION