Hexamine ((CH2)6N4) is a chemical created by the reaction of 6 moles of formaldehyde and 4 moles of ammonia . It is crystalline and white in appearance and is used both for commercial and recreational purposes. Particle size ranges from 80-800 microns and it melts at 270 degrees C.

Hexamine can be absorbed through the skin, and some people are allergic to it. This usually only manifests as a rash.

It is used in rubber and textile adhesives, fuel tablets, the photographic industry, the explosives industry, a corrosive inhibitor, as a protein modifier, as a reagent in chemical analysis, and in the production of deodorizer and hair fixers, among many other uses.