Which NFPA 704 color indicates reactivity hazard?

Which NFPA 704 color indicates reactivity hazard?

• A. Health (blue)
• B. Flammability (red)
• C. Reactivity (yellow)
• D. Special information (white)

Answer: (C)

Reactivity hazard is shown by the yellow section of the NFPA 704 diamond. In this system, each color flags a different type of hazard: blue for health, red for flammability, yellow for reactivity, and white for special information. The number inside the yellow area (0–4) indicates how severe the reactivity risk is, with higher numbers meaning more unstable or reactive material. Reactivity covers how a substance might become unstable, release gases, polymerize, or detonate under conditions like heat, shock, or contact with other chemicals. The blue and red sections address health and flammability risks, while the white section provides any special handling notes, such as oxidizer or water-reactive requirements.

Reactivity hazard is shown by the yellow section of the NFPA 704 diamond. In this system, each color flags a different type of hazard: blue for health, red for flammability, yellow for reactivity, and white for special information. The number inside the yellow area (0–4) indicates how severe the reactivity risk is, with higher numbers meaning more unstable or reactive material. Reactivity covers how a substance might become unstable, release gases, polymerize, or detonate under conditions like heat, shock, or contact with other chemicals. The blue and red sections address health and flammability risks, while the white section provides any special handling notes, such as oxidizer or water-reactive requirements.