Primary explosives hotspots

Usually it is assumed, that on impact most primary explosives are initiated by hotspots from inter-crystalline friction. For secondary explosives, as a general rule, initiation by impact results in the formation of hotspots, which originate (adiabatic compression) from gas bubbles between the crystals. Such hotspots only exist for approximately 10 6 s. 

Table 4.1 Temperatures for the initiation of some primary and secondary explosives by friction (via hotspots) and thermal mechanisms...

---