Which term is used to classify flammable solids that include metals and non-metals, specifically designated as 4.1 in the hazard classification?

• A. Packing Group II
• B. Packing Group III
• C. Class 4.1
• D. Self-reactive substance

Answer: (C)

Think about how dangerous goods are labeled for transport. Flammable solids are grouped under Class 4, and the subdivision 4.1 is the label for those solids that can ignite or burn readily in solid form. The term used to classify these materials, including certain metals and non-metals, is Class 4.1. Packing groups relate to packaging requirements and hazard level within specific classes, not the class name itself, and a self-reactive substance sits in a different hazard category rather than being the general label for flammable solids. For example, a solid like magnesium powder fits under 4.1 because it can ignite easily as a solid.