Which class of fire is not applicable to organic materials?

Class D fires specifically pertain to combustible metals and not to organic materials. This class of fire involves materials such as magnesium, titanium, and sodium, which burn at high temperatures and require special extinguishing agents that are effective for metal fires. Organic materials, on the other hand, such as wood, paper, and textiles, fall under Class A fires, which are extinguished with water or foam-based agents suitable for materials that leave ashes.

Understanding the classification of fires is essential for efficient firefighting tactics. By recognizing that Class D is distinctly related to metals, it's clearer why organic materials would not be relevant. This knowledge helps firefighters determine the appropriate equipment and extinguishing methods needed when responding to fires involving different kinds of materials.