Emergency Response Guidebook (ERG) Practice Test 2025 – The All-in-One Guide to Master Your Exam!

Class one hazards specifically pertain to explosives and materials that are designed to cause an explosion through a chemical reaction. This class is clearly defined to include substances that have the potential for explosive reactions, such as explosives, fireworks, and detonators.

Flammable solids, however, fall under a different category of hazardous materials entirely. While they are indeed dangerous, they do not fit into the class one classification that is reserved for explosive materials. Flammable solids are categorized separately under class four hazards, which pertains to materials that can ignite easily or combust when in contact with heat or flames. Hence, identifying flammable solids as not being included in class one hazards is accurate and highlights the distinctions between different classes of hazardous materials.