NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Hydrogen bromide

CAS
10035-10-6

HBr

RTECS
MW3850000
Synonyms & Trade Names

Anhydrous hydrogen bromide; Aqueous hydrogen bromide (i.e., Hydrobromic acid)
DOT ID & Guide
1048 / 125 (anhydrous)
1788 / 154 (solution)

Exposure
Limits

NIOSH REL: C 3 ppm (10 mg/m3)
OSHA PEL: TWA 3 ppm (10 mg/m3)
IDLH
30 ppm See: 10035106
Conversion
1 ppm = 3.31 mg/m3
Physical Description
Colorless gas with a sharp, irritating odor. [Note: Shipped as a liquefied compressed gas. Often used in an aqueous solution.]
MW: 80.9
BP: -88°F
FRZ: -124°F
Sol: 49%
VP: 20 atm
IP: 11.62 eV
RGasD: 2.81

Fl.P: NA
UEL: NA
LEL: NA

Nonflammable Gas
Incompatibilities & Reactivities

Strong oxidizers, strong caustics, moisture, copper, brass, zinc [Note: Hydrobromic acid is highly corrosive to most metals.]
Measurement Methods
NIOSH 7903; OSHA ID165SG
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
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
See also: INTRODUCTION   See ICSC CARD: 0282