Which statement correctly identifies the two main categories of IED explosives?

• A. Low explosives
• B. High explosives
• C. Low and High explosives
• D. Chemical explosives

Answer: (C)

Understanding how IEDs release energy helps explain why different materials behave so differently. There are two main categories based on how quickly they release energy: low explosives and high explosives. Low explosives burn rapidly (deflagrate) and rely on confinement to turn that rapid combustion into pressure, so their effects come from gas expansion rather than a true shock detonation. They’re typically slower and produce less overpressure, with examples like gunpowder or black powder. High explosives, on the other hand, detonate and generate a shock wave with a very high peak pressure, producing much greater destructive force; examples include TNT, RDX, and PETN. The broad label “chemical explosives” is too vague because it doesn’t separate devices by whether they detonate or merely burn, which is the critical distinction for blast characteristics. So the option that names both categories—low and high explosives—best captures the standard way this topic is organized.