What class of fire involves metal?

The classification of fires is based on the materials that are burning and how they should be extinguished. Class D fires specifically involve combustible metals. These metals, which can include magnesium, titanium, aluminum, and sodium, ignite and burn at very high temperatures, presenting unique hazards that require specialized extinguishing agents.

For Class D fires, typical extinguishing agents like water or regular fire extinguishers are ineffective and can even worsen the situation. Instead, dry powder agents that are specifically formulated for these types of fires are used to smother the flames and promote safety. In contrast, the other classes of fires involve different materials such as ordinary combustibles, flammable liquids, or energized electrical equipment, each requiring their own specific handling and extinguishing techniques.