Cyclotrimethylenetrinitramine. Also called "Cyclonite" or "Hexogen" it is a white crystalline solid used in mixtures with other explosives, oils or waxes, it is rarely used by itself.

RDX, standing for Research Department Explosive, was one of the first manufactured 'plastic' explosives. It was widely used during WW2, where it was known as 'cyclonite by the UK and US forces, 'hexogen' by the Germans, and 'T4' by the Italian military. Its chemical descriptive name is cyclotrimethylenetrinitramine.

RDX, an acronym for Research Department Explosive, is an explosive nitro amine widely used in military and industrial applications. It is also known less commonly as cyclonite, hexogen (particularly in German and German-influenced languages), and T4. Its chemical name is cyclotrimethylenetrinitramine; variants include cyclotrimethylene-trinitramine and cyclotrimethylene trinitramine.