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Hydrogen bromide

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Synonyms & Trade Names
Anhydrous hydrogen bromide, Aqueous hydrogen bromide
CAS No.
10035-10-6
RTECS No.
MW3850000
DOT ID & Guide
1048 125(anhydrous)
1788 154(solution)
Formula
HBr
Conversion
1 ppm = 3.31 mg/m3
IDLH
30 ppm
See: 10035106
Exposure Limits
NIOSH REL
C 3 ppm (10 mg/m3)
OSHA PEL
TWA 3 ppm (10 mg/m3) See Appendix G
Measurement Methods
NIOSH 7903;
OSHA ID165SG
See: NMAM or OSHA Methods
Physical Description
Colorless gas with a sharp, irritating odor. [Note: Shipped as a liquefied compressed gas. Often used in an aqueous solution.]
Molecular Weight
80.9
Boiling Point
-88°F
Freezing Point
-124°F
Solubility
49%
Vapor Pressure
20 atm
Ionization Potential
11.62 eV
Flash Point
NA
Upper Explosive Limit
NA
Lower Explosive Limit
NA
Relative Gas Density
2.81
Nonflammable Gas
Incompatibilities & Reactivities
Strong oxidizers, strong caustics, moisture, copper, brass, zinc [Note: Hydrobromic acid is highly corrosive to most metals.]
Exposure Routes
inhalation, ingestion (solution), skin and/or eye contact
Symptoms
irritation eyes, skin, nose, throat; solution: eye, skin burns; liquid: frostbite
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact (solution)/Frostbite
Eyes:Prevent eye contact (solution)/Frostbite
Wash skin:When contaminated (solution)
Remove:When wet or contaminated (solution)
Change:No recommendation
Provide:Eyewash (liquid), Quick drench (solution), Frostbite wash
First Aid
(See procedures)
Eye:Irrigate immediately (solution)/Frostbite
Skin:Water flush immediately (solution)/Frostbite
Breathing:Respiratory support
Swallow:Medical attention immediately (solution)
Respirator Recommendations

NIOSH/OSHA

Up to 30 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode£
(APF = 25) Any powered, air-purifying respirator with acid gas cartridge(s)£
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted acid gas 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 acid gas canister
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0282
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health