Blasting cap

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A blasting cap is a small sensitive primary explosive device generally used to detonate a larger, more powerful and less sensitive secondary explosive such as TNT, dynamite, or plastic explosive.

Blasting caps come in a variety of types, some of which are: non-electric caps, electric caps, and fuse caps. They are used in commercial mining, excavation, and demolition. Electric types are set off by a dynamo device which generates a short burst of current conducted by a long wire to the cap to ensure safety. Traditional fuse caps have a fuse which is lit by a match.

The need for blasting caps arises from sensitivity issues of an explosive compound. All explosive compounds require a certain amount of energy to detonate. If an explosive is too sensitive, it may go off unexpectedly, so most commercial explosives are formulated to be stable and safe to handle and will not explode if accidentally dropped, mishandled, or exposed to fire. However, such explosives (called secondary explosives) are hard to detonate intentionally as well. A blasting cap contains an easy-to-ignite explosive that provides the initial activation energy to start a detonation in a more stable explosive. The blasting cap is stored separately and not inserted into the main explosive charge until just before use, keeping the main charge safe.

Most blasting caps contain what is called a primary explosive, which is a high explosive compound that will explode from flame, heat or shock. A blasting cap may also...
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