c4

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 timer rigged on it to trigger the explosion.

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This tag implicates explosive (learn more).