Which class of fire involves combustible metals?

The class of fire involving combustible metals is classified as Class D. This classification is specifically designed to address fires that involve metallic materials, such as magnesium, aluminum, and titanium, which burn at extremely high temperatures and can react violently with water or other extinguishing agents.

Class D fires require specialized extinguishing agents that are effective for metal fires, typically dry powder agents that smother the burning metal and prevent oxygen from reaching it. This contrasts with other classes of fire: Class A pertains to ordinary combustibles (such as wood, paper, and textiles), Class B involves flammable liquids and gases, and Class C includes fires involving electrical equipment. Each class necessitates different firefighting methods and tools due to the unique characteristics and behaviors of the materials involved.