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Diborane

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Synonyms & Trade Names
Boroethane, Boron hydride, Diboron hexahydride
CAS No.
19287-45-7
RTECS No.
HQ9275000
DOT ID & Guide
1911 119
Formula
B₂H₆
Conversion
1 ppm = 1.13 mg/m3
IDLH
15 ppm
See: 19287457
Exposure Limits
NIOSH REL
TWA 0.1 ppm (0.1 mg/m3)
OSHA PEL
TWA 0.1 ppm (0.1 mg/m3)
Measurement Methods
NIOSH 6006
See: NMAM or OSHA Methods
Physical Description
Colorless gas with a repulsive, sweet odor. [Note: Usually shipped in pressurized cylinders diluted with hydrogen, argon, nitrogen, or helium.]
Molecular Weight
27.7
Boiling Point
-135°F
Freezing Point
-265°F
Solubility
Reacts
Vapor Pressure
(62°F): 39.5 atm
Ionization Potential
11.38 eV
Flash Point
NA (Gas)
Upper Explosive Limit
88%
Lower Explosive Limit
0.8%
Relative Gas Density
0.97
Flammable Gas
Incompatibilities & Reactivities
Water, halogenated compounds, aluminum, lithium, oxidized surfaces, acids [Note: Will ignite spontaneously in moist air at room temperature. Reacts with water to form hydrogen & boric acid.]
Exposure Routes
inhalation
Symptoms
Chest tightness, precordial pain, short breath, nonproductive cough, nausea; headache, dizziness, chills, fever, lassitude (weakness, exhaustion), tremor, muscle fasciculation; In Animals: liver, kidney damage; pulmonary edema; hemorrhage
Target Organs
respiratory system, central nervous system, liver, kidneys
Personal Protection/Sanitation
(See protection codes)
Skin:No recommendation
Eyes:No recommendation
Wash skin:No recommendation
Remove:No recommendation
Change:No recommendation
First Aid
(See procedures)


Breathing:Respiratory support
Respirator Recommendations

NIOSH/OSHA

Up to 1 ppm:
(APF = 10) Any supplied-air respirator

Up to 2.5 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode

Up to 5 ppm:
(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece

Up to 15 ppm:
(APF = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode

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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0432   MEDICAL TESTS: 0069
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health