Stable under ordinary conditions of use and storage. Substance can supercool without crystallizing. Liberates explosive hydrogen gas when reacting with chlorides and stainless steel. Can react violently with sodium tetrahydroborate. Exothermic reactions with aldehydes, amines, amides, alcohols and glycols, azo-compounds, carbamates, esters, caustics, phenols and cresols, ketones, organophosphates, epoxides, combustible materials, unsaturated halides, and organic peroxides.
Phosphoric acid forms flammable gases with sulfides, mercaptans, cyanides and aldehydes.
It also forms toxic fumes with cyanides, sulfide, fluorides, organic peroxides, and halogenated organics. Mixtures with nitromethane are explosive. Phosphorus oxides may form when heated to decomposition. Causes irritation and possibly burns on contact. Harmful if swallowed or inhaled.