Sensitivity, stability and brisance are three of the most significant properties of explosives that affect their use and application. All explosive compounds have a certain amount of energy required to initiate. If an explosive is too sensitive, it may go off accidentally. A safer explosive is less sensitive and will not explode if accidentally dropped or mishandled. However, such explosives are more difficult to initiate intentionally.
Less sensitive explosives can be initiated by smaller quantities of more sensitive explosives, called primers or detonators, such as blasting caps. The use of increasingly less sensitive explosive materials to create an escalating chain reaction is known as an explosive train, initiation sequence, or firing train.
High explosives are conventionally subdivided into two explosives classes, differentiated by sensitivity:
- Primary explosives are extremely sensitive to mechanical shock, friction, and heat, to which they will respond by burning rapidly or detonating.
- Secondary explosives, also called base explosives, are relatively insensitive to shock, friction, and heat.
- NAVSEA OP 5, Volume 1. U.S. Navy.
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