At room temperature, diborane decomposes to produce hydrogen and higher borane. The decomposition rate increases with the increase of temperature and concentration, and non-volatile boranes such as butyl borane and pentaborane are produced. The produced advanced borane is more sensitive to impact than pure diborane. When the temperature exceeds 500 F (300 C), diborane is decomposed into boron and hydrogen. Due to the instability of pure diborane, its gas products need to be mixed with other gases, including diluents and decomposition inhibitors.

Contraindications to compatibility (materials to be avoided): oxidants, aluminum, lithium, halides and metal oxides.

Reaction: a) dangerous decomposition products: polymerization produces hydrogen and higher borane; B) dangerous polymerization: it will not happen.