Practice question

In NFPA 704, a numeric rating of 4 in the red (flammability) quadrant indicates a material that:

  1. Will not burn
  2. Burns only after considerable preheating
  3. Vaporizes readily and burns very easily (extreme flammability)
  4. Is only a health hazard

Answer: C — Vaporizes readily and burns very easily (extreme flammability)

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