Which fires require a Class D fire extinguisher?

Which fires require a Class D fire extinguisher?

• A. Flammable and combustible liquids, such as gasoline, oil, grease, tar, oil-based paint, lacquer, solvents, and flammable gases
• B. Ordinary combustibles, such as wood, paper, cloth, rubber, many plastics, dried grass, hay, and stubble
• C. Energized electrical equipment, such as starters, breakers, and motors
• D. Combustible metals, such as magnesium, sodium, zinc, and potassium

Answer: (D)

Fires involving combustible metals require a different approach because these metals burn at very high temperatures and can react violently with water or other common extinguishing agents. Metals like magnesium, sodium, zinc, and potassium need a Class D extinguisher that uses a special dry powder formulated for metal fires. The powder blankets the metal, smothers the flame, and helps prevent re-ignition by isolating the metal from oxygen without reacting with it. Water or ordinary extinguishing agents can be dangerous or ineffective on metal fires. Fires involving ordinary combustibles (wood, paper, cloth) are handled with Class A extinguishers. Flammable liquids (gasoline, oil, solvents) require Class B extinguishers. Energized electrical equipment fires call for Class C extinguishers (or appropriate electrical-safe methods). Therefore, fires involving combustible metals are the ones that require a Class D extinguisher.

Fires involving combustible metals require a different approach because these metals burn at very high temperatures and can react violently with water or other common extinguishing agents. Metals like magnesium, sodium, zinc, and potassium need a Class D extinguisher that uses a special dry powder formulated for metal fires. The powder blankets the metal, smothers the flame, and helps prevent re-ignition by isolating the metal from oxygen without reacting with it. Water or ordinary extinguishing agents can be dangerous or ineffective on metal fires.

Fires involving ordinary combustibles (wood, paper, cloth) are handled with Class A extinguishers. Flammable liquids (gasoline, oil, solvents) require Class B extinguishers. Energized electrical equipment fires call for Class C extinguishers (or appropriate electrical-safe methods). Therefore, fires involving combustible metals are the ones that require a Class D extinguisher.