What hazard classification indicates that a material is explosive?

The classification that indicates a material is explosive is Class 1. This class specifically encompasses explosives, which are materials that undergo a rapid chemical reaction leading to the production of gas at high temperatures and pressures, which can result in an explosion.

Class 1 is further subdivided into various divisions based on the nature of the explosive hazard, such as detonation characteristics, risk of mass explosion, or the sensitivity of the material to accidental initiation. It is crucial for the safe handling and transportation of explosives, as they have specific packaging, labeling, and storage requirements to mitigate the risks associated with their potential for sudden and violent reactions. Understanding this classification helps responders and shippers identify and manage these materials appropriately in compliance with safety regulations.