What is the primary function of a fire extinguisher classified under Class D?

A fire extinguisher classified under Class D is specifically designed to combat metal fires, which can occur when combustible metals such as magnesium, sodium, and potassium ignite. These types of fires require specialized extinguishing agents, as traditional extinguishing agents like water can exacerbate the fire. Class D extinguishers typically contain dry powder agents that smother the flames and create a protective barrier.

Other classifications of fire extinguishers address different fire types, such as ordinary combustibles, flammable liquids, and electrical fires, but Class D is uniquely tailored to handle the hazards associated with combustible metals. This importance is critical for ensuring proper fire safety protocols, especially in environments where such metals are present.