What hazard class includes flammable solids and corrosive poisons?

The correct classification for flammable solids and corrosive poisons falls under Hazard Class 4. This class specifically encompasses materials that present hazards related to flammability and reactivity, particularly in solid forms. Flammable solids can ignite easily and sustain combustion, while corrosive poisons can cause severe damage to living tissue or material upon contact.

Hazard Class 1 deals primarily with explosives, Hazard Class 2 pertains to gases including flammable or compressed gases, and Hazard Class 3 includes flammable liquids. Each of these classes has distinct characteristics and handling requirements tailored to their specific hazards. In contrast, Hazard Class 4 uniquely addresses the issues surrounding solid materials that can ignite and corrosive substances that pose significant risks of chemical burns and toxicity.