What type of fire extinguisher should you use on metal fires?
A: Wet chemical.
B: Dry powder.
D: Class A.
CBK 3: Security Engineering
Source: ThorTeaches.com practice tests
B: Dry Powder Extinguishers (sodium chloride, graphite, ternary eutectic chloride). Lowers the temperature and removes oxygen in the area. Primarily used for metal fires (sodium, magnesium, graphite).