Answer :
Final answer:
Class D fire extinguishers are used for fires involving combustible metals and alloys, with a special formulation to smother and cool the metal to prevent re-ignition.
Explanation:
The classification of portable fire extinguisher used for fires that involve combustible metals and alloys is Class D. Class D extinguishers are specifically designed to tackle fires from metals such as magnesium, titanium, zirconium, sodium, and potassium that can react violently with water, air, or other chemicals.
It is crucial to use the correct type of fire extinguisher since using the wrong one could exacerbate the fire. Unlike Class A extinguishers for common combustibles like wood and paper, or Class B for flammable liquids, or Class K for kitchen fires involving cooking oils and fats, Class D extinguishers contain a dry powder agent that can effectively smother and cool the metal fires to prevent re-ignition.
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