Which of the following is NOT a type of HAZMAT?

Inert materials are substances that do not readily undergo chemical reactions or engage with other materials under standard conditions. As a result, they are considered non-reactive and not hazardous. HAZMAT, or hazardous materials, refer specifically to substances that pose a risk to health, safety, or the environment due to their physical or chemical properties.

Flammable materials, corrosive materials, and toxic materials all present various levels of hazards: flammable materials can catch fire easily, corrosive materials can damage living tissue and material upon contact, and toxic materials can be harmful or lethal if ingested, inhaled, or absorbed. In contrast, inert materials lack these dangerous characteristics, making them the correct answer as they are not classified as hazardous.