Class D fires are associated with which of the following materials?

Class D fires specifically involve combustible metals, such as magnesium, titanium, sodium, and potassium. These types of fires are unique because they cannot be extinguished using water, as water can react dangerously with the burning metal, potentially causing explosions or the fire to spread. Instead, specialized extinguishing agents, such as dry powder agents designed for metal fires, should be used; they work by smothering the fire and interrupting the combustion process without reacting unfavorably with the metals involved.

In contrast, flammable liquids are classified as Class B fires, which involve substances like gasoline or oil, and dangerously reactive materials would not typically fall under the classification of Class D fires. Understanding these classifications is crucial for responding effectively to different types of fires in an emergency situation, ensuring proper safety measures and extinguishing methods are utilized.