C4 is an acronym used to refer to Composition C-4, a type of plastic explosive. It is a widely used explosive material in military and industrial applications due to its relative stability, low cost, and ease of use. C4 consists of a plasticized mixture of RDX (cyclotrimethylene trinitramine) and PETN (pentaerythritol tetranitrate), along with a few other ingredients. The exact composition of C4 varies depending on the manufacturer, but the RDX content is usually around 91%, and the PETN content is usually around 8%.
C4 is a highly stable explosive material, meaning it does not spontaneously detonate like some other explosives. It requires a detonator, or a shock wave from a nearby explosion, to set it off. C4 is relatively safe to handle and can be molded into any shape, making it ideal for use in a wide range of applications. It is employed in demolition operations, as well as in the construction of improvised explosive devices (IEDs). C4 is also used in mining and quarrying operations, as well as in some industrial applications.
Since C4 is a very powerful explosive, it is strictly regulated and requires a government permit to purchase. It is also important to handle C4 with care, as it does present some safety risks. Improper handling can lead to accidental detonation, which can cause serious injury or death.