Which label marking indicates a water-reactive hazard?

Which label marking indicates a water-reactive hazard?

• A. Flame symbol
• B. The "W" symbol on the label
• C. Skull and crossbones
• D. Environment symbol

Answer: (B)

Recognizing a water-reactive hazard on labels means looking for the W symbol. That marking signals that the material can react violently with water or moisture, so it must be kept dry and handled with dry, inert methods. It also guides responders to avoid using water to extinguish or cool such a material and to use appropriate dry extinguishing agents if needed. The other symbols point to different risks: a flame means flammable or combustible, skull and crossbones denote toxicity, and the environment symbol signals environmental hazards. The W mark specifically alerts you to water reactivity.

Recognizing a water-reactive hazard on labels means looking for the W symbol. That marking signals that the material can react violently with water or moisture, so it must be kept dry and handled with dry, inert methods. It also guides responders to avoid using water to extinguish or cool such a material and to use appropriate dry extinguishing agents if needed.

The other symbols point to different risks: a flame means flammable or combustible, skull and crossbones denote toxicity, and the environment symbol signals environmental hazards. The W mark specifically alerts you to water reactivity.