What type of hazard does "explosive when heated" indicate?

The designation of "explosive when heated" refers to a physical hazard. This classification is important because it pertains to the characteristics of materials in their physical form and how they can react under certain conditions, such as exposure to heat.

Physical hazards encompass a variety of risks, including those that can lead to fire, explosion, or other violent reactions. Materials that can explode when exposed to elevated temperatures can pose immediate dangers to workers and the surrounding environment, necessitating appropriate safety measures and handling protocols.

Health hazards, on the other hand, relate to substances that could affect human health, such as toxicity or carcinogenicity, but they do not specifically address the physical characteristics of materials in terms of stability or reactivity. Environmental hazards pertain to potential risks posed by substances to ecosystems, but the "explosive when heated" label is primarily concerned with the immediate physical dangers associated with heating certain materials.