What is an example of an explosive substance classified under HAZMAT?

Dynamite is classified as an explosive substance under HAZMAT due to its chemical properties that allow it to undergo rapid decomposition, releasing gas and heat, which can lead to an explosion. Dynamite contains nitroglycerin, a highly sensitive explosive that can detonate under shock, heat, or friction, making it a significant hazard in transportation and storage.

In contrast, chlorine gas is categorized as a toxic substance rather than an explosive, while diesel fuel is classified as a flammable liquid, posing fire hazards rather than explosive risks. Asphalt, although it can become flammable under certain conditions, does not possess the properties of an explosive either. Therefore, dynamite stands out as the correct example of an explosive substance within the context of HAZMAT classifications.