What materials are classified as Class D fuels?

Class D fuels specifically refer to combustible metals, which are materials that can ignite and burn at high temperatures. This category includes metals such as magnesium, aluminum, titanium, and sodium. Class D fires demand unique extinguishing agents because standard methods, like water or foam, can exacerbate the situation or lead to explosions due to the chemical reactions that metals can have with these substances.

The classification of combustible metals as Class D is crucial for several reasons. Firstly, understanding that they behave differently than organic materials or gases allows firefighters and emergency responders to use appropriate techniques and agents for containment and extinguishment. For instance, using a Class D fire extinguisher with a dry powder agent is essential, as it can smother the fire without the risk of reaction that may occur with water.

In contrast, materials such as wood and paper products are classified under Class A, flammable gases fall under Class B, and electrical wiring is not classified as a fuel source for fires but rather represents a potential ignition source. Each of these fuel classes requires its own methods for effective firefighting tactics, underscoring the importance of the classification system in emergency response.