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Agent Name Diborane CAS Number 19287-45-7 Formula B2-H6 Major Category Toxic Gases & Vapors Synonyms Boroethane; Boron hydride; Diboron hexahydride; Diborane; [ChemIDplus] UN1911 Category Hydrides Description Colorless gas with a repulsive, sweet odor; Note: Usually shipped in pressurized cylinders diluted with hydrogen, argon, nitrogen, or helium; [NIOSH] Sources/Uses Used as a rocket fuel, semiconductor doping agent, rubber vulcanizer, reducing agent, and polymerization catalyst; [ACGIH] Comments Listed as one of "major irritant airborne toxicants"; [LaDou, p. 523] Animals exposed to high concentrations develop respiratory irritation and pulmonary edema; [ACGIH] Corrosive to the skin and eyes; [ICSC] Reference Link ATSDR Medical Management - Diborane Exposure Assessment Skin Designation (ACGIH) No TIH Yes TLV (ACGIH) 0.1 ppm PEL (OSHA) 0.1 ppm IDLH (NIOSH) 15 ppm Excerpts from Documentation for IDLHs Human data: None relevant for use in determining the revised IDLH. Odor Threshold Low 1.8 ppm Odor Threshold High 3.5 ppm Lethal Concentration LC50 (rats) = 40 ppm/4H Explanatory Notes Odor threshold from AIHA; Flash point = -90 deg C; Reference Link International Chemical Safety Cards (WHO/IPCS/ILO) Flammability (NFPA) 4: burns readily Adverse Effects Toxic Pneumonitis Yes Dermatotoxin Skin Burns Links to Other NLM Databases Health Studies Human Health Effects from Hazardous Substances Data Bank: DIBORANE   Toxicity Information Search TOXNET Chemical Information Search ChemIDplus Related Information in Haz-Map Diseases Occupational diseases associated with exposure to this agent: Pneumonitis, toxic Processes Industrial Processes with risk of exposure: Semiconductor Manufacturing

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