Ammonia

Lower explosive limit: 13% by volume; Upper explosive limit: 28% by volume

Explosion hazard when exposed to flame or in a fire. Ammonia + air in a fire can detonate ... Forms sensitive explosive mixtures with air + hydrocarbons, 1-chloro-2,4-dinitrobenzene, 2- or 4- chloronitrobenzene (above 160 deg C/30 bar), ethanol + silver nitrate, germanium derivatives, stibine, and chlorine. Reactions with silver chloride, silver nitrate, silver azide, and silver oxide form the explosive silver nitride. Reactions with chlorine azide, bromine, iodine, iodine + potassium, heavy metals and their compounds (e.g., gold(III) chloride, mercury, and potassium thallium amide ammoniate), tellurium halides (e.g., tellurium tetrabromide and tellurium tetrachloride) and penta-borane(9) give explosive products.

May be an explosion hazard in a confined space ... Reacts with hypochlorite or other halogen sources to form explosive compounds that are sensitive to pressure or increases in temperature.

Critical temp of 133 deg c is easily exceeded in fires so that containers of liquefied ammonia may explode unless their rupture strength is safely in excess of 112 atm.