Class D fires are caused by which type of materials?

Class D fires are specifically associated with combustible metals, often referred to as ignitable metals. These types of fires require special handling because traditional extinguishing agents, like water, can exacerbate the situation. Combustible metals, such as magnesium, titanium, and sodium, react violently with water, making it crucial to use appropriate extinguishing methods that are designed for metal fires, such as dry powder extinguishers specifically rated for Class D fires.

In contrast, the other choices pertain to different classes of fires: ordinary combustibles are classified under Class A, flammable liquids fall under Class B, and electrical fires are categorized as Class C. Understanding these classifications is essential for effective fire prevention and response strategies in various environments.