What type of materials does a Class D fire involve?

A Class D fire involves combustible metals, which are unique compared to other types of fires due to the specific nature of the materials that ignite easily and burn at high temperatures. Common combustible metals include magnesium, aluminum, lithium, and potassium. These metals can react violently with water and are not extinguished effectively using standard fire suppression methods, such as water or foam, which can exacerbate the situation. Instead, specialized extinguishing agents designed for Class D fires are required, such as dry powder extinguishing agents that can smother or interrupt the burning process of these metals.

Understanding the specific nature of Class D fires is crucial for maritime crew members as they must be equipped to handle such hazards effectively in a maritime environment where combustible metals might be present, such as during the maintenance of equipment or the handling of certain cargoes.