Fires resulting from combustible metals, such as sodium, potassium, titanium, and magnesium, are categorized as Class _____ fires.

Fires involving combustible metals like sodium, potassium, titanium, and magnesium are categorized as Class D fires. This classification is specifically designated for fires that occur from combustible metals, which burn at extremely high temperatures and cannot be extinguished using typical fire suppression methods, such as water or foam.

Class D fires require special extinguishing agents and methods designed specifically for that type of fire because using water can actually exacerbate the situation, leading to an explosive reaction. Understanding this classification is crucial for fire safety and response, especially in environments where reactive metals are handled. This focus on appropriate reaction and control is essential for managing the risks associated with these hazardous materials.