What defines a Class D fire?

A Class D fire is characterized specifically by the involvement of combustible metals such as magnesium, titanium, potassium, and sodium. These types of metals burn at very high temperatures and can react violently when exposed to water or certain extinguishing agents. The unique nature of combustible metals necessitates specialized extinguishing agents, such as dry powder agents, which are designed to smother the fire or absorb heat, rather than conventional water-based methods that might exacerbate the situation.

In contrast, fires involving flammable liquids, live electrical equipment, or organic materials fall into different classifications of fires (Class B, Class C, and Class A respectively), and each has its own set of properties and extinguishing methods. Understanding the characteristics of these fire classes is crucial for effective fire response and safety procedures. Identifying Class D fires allows responders to select appropriate measures for controlling and extinguishing the fire without worsening the situation.