Diborane Characteristics
Synonyms Boroethane, Boron hydride, Diboron hexahydride
CAS No. 19287-45-7
Chemical formula B2H6
Vapour density 0.97 (air = 1)
Safe Work Australia ES TWA 0.1 ppm
Flammable limits LEL 0.8% by volume
UEL 88% by volume
Equipment group -1
Temperature classification -1
Chemical/physical properties Diborane is a colourless, unstable gas with what is described as a sickly-sweet, nauseating odour, reportedly detectable by smell at around 2.5 ppm.
Diborane is a strong reducing agent and will react explosively with most oxidising agents, including halogenated hydrocarbons.
Hazardous properties With an autoignition temperature of 38°C, it presents a high explosion risk and can ignite spontaneously in moist air.
Diborane is highly toxic, entering the body principally by inhalation and targets the respiratory system, central nervous system, liver and kidneys. The vapours also have an irritant effect on the skin and mucous membranes.
Occurrence/Uses Diborane’s main application is as a doping agent in the semiconductor industry.
Detectors available Electrochemical (0 – 0.3 ppm)
Gas detector tube (0.02 – 5.0 ppm)
Suggested alarm levels Lo: 0.1 ppm
Hi: 0.3 ppm
Notes (1) Not listed in AS/NZS 60070.20.1:2012


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