# NIOSH Pocket Guide to Chemical Hazards
Diborane | CAS 19287-45-7
B2H6 | RTECS HQ9275000
Synonyms & Trade Names Boroethane, Boron hydride, Diboron hexahydride | DOT ID & Guide 1911 119
Exposure Limits | NIOSH REL: TWA 0.1 ppm (0.1 mg/m3)
OSHA PEL: TWA 0.1 ppm (0.1 mg/m3)
IDLH 15 ppm | Conversion 1 ppm = 1.13 mg/m3
Physical Description Colorless gas with a repulsive, sweet odor. [Note: Usually shipped in pressurized cylinders diluted with hydrogen, argon, nitrogen, or helium.]
MW: 27.7 | BP: -135°F | FRZ: -265°F | Sol: Reacts
VP(62°F): 39.5 atm | IP: 11.38 eV | RGasD: 0.97 |
Fl.P: NA (Gas) | UEL: 88% | LEL: 0.8% |
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.]
Measurement Methods NIOSH 6006
Personal Protection & Sanitation 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
Exposure Routes inhalation
Symptoms Chest tightness, precordial pain, shortness 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
See also: INTRODUCTION