What hazard class is represented by the placard drawing?

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Multiple Choice

What hazard class is represented by the placard drawing?

Explanation:
A flame symbol on a placard points to flammability. That tells you the material is a Class 4 hazardous material: Flammable Solids. These are solids that ignite easily or can burn vigorously, sometimes even when sparked by friction, heat, or contact with water to release flammable gases. The other hazard classes use different pictograms—toxicity would show a poison/poison-gas symbol, explosives would have an exploding-bomb symbol, and oxidizers are indicated by a flame over a circle—so the flame alone most directly signals flammable solids.

A flame symbol on a placard points to flammability. That tells you the material is a Class 4 hazardous material: Flammable Solids. These are solids that ignite easily or can burn vigorously, sometimes even when sparked by friction, heat, or contact with water to release flammable gases. The other hazard classes use different pictograms—toxicity would show a poison/poison-gas symbol, explosives would have an exploding-bomb symbol, and oxidizers are indicated by a flame over a circle—so the flame alone most directly signals flammable solids.

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