A container of flammable solids would receive a United Nations Label or placard with a hazardous classification number of:

A container of flammable solids would receive a United Nations Label or placard with a hazardous classification number of:

• A. 4
• B. 3
• C. 2
• D. 5

Answer: (A)

Hazard labeling uses dedicated classes to identify the type of hazard. Flammable solids are placed in a class that covers solids capable of ignition, including those that can heat up or ignite through friction or chemical reactions. This class is separate from those used for flammable liquids, gases, or oxidizing substances, so the label you apply should reflect the solid-ignition category, not the liquid, gas, or oxidizer categories. The other classes correspond to flammable liquids, gases, and oxidizing substances, respectively, which is why they don’t fit a container that contains flammable solids.

Hazard labeling uses dedicated classes to identify the type of hazard. Flammable solids are placed in a class that covers solids capable of ignition, including those that can heat up or ignite through friction or chemical reactions. This class is separate from those used for flammable liquids, gases, or oxidizing substances, so the label you apply should reflect the solid-ignition category, not the liquid, gas, or oxidizer categories. The other classes correspond to flammable liquids, gases, and oxidizing substances, respectively, which is why they don’t fit a container that contains flammable solids.