primary explosive

Primary explosives are a type of chemical explosive that are highly sensitive to stimuli such as friction, blows, shock, or heat. They detonate when exposed to a source of heat, like a flame or spark. Examples of primary explosives include mercury fulminate and lead azide.12

Chemical explosives are broadly categorized into two types: high explosives (detonating) and low explosives (deflagrating). High explosives, like TNT and dynamite, decompose very rapidly and create high pressure. Low explosives, such as gunpowder, burn quickly and produce lower pressures. Primary explosives are a subdivision of high explosives, distinguished by their sensitivity to initiation.2