A type of of plastic [[explosive]] (soft and moldable explosive) of the Composition C line of US-specified explosives consisting primarily of RDX.

C4 is very stable and insensitive to most physical shocks. C4 cannot be detonated by a gunshot or by dropping it onto a hard surface. It does not explode when set on fire or exposed to microwave radiation. Detonation can only be initiated by a combination of extreme heat and a shockwave, such as when a [[detonator]] inserted into it is fired.

C4 usually appears as a wrapped block of white substance, with popular culture depiction of the explosive often has some wiring or [[time bomb|timer]] rigged on it to trigger the [[explosion]].

h4. See also
* [[List of Weapons]]
* [[TNT]]
h4. External links
* Wikipedia: "C-4":http://en.wikipedia.org/wiki/C-4_explosive
* Wikipedia: "Composition C":http://en.wikipedia.org/wiki/Composition_C
c4