What is a characteristic of Class D fires?

Class D fires are defined as fires that involve combustible metals. These types of fires can be particularly hazardous because they require specific extinguishing agents that are compatible with the burning metal. Common metals that can ignite and create Class D fires include magnesium, potassium, sodium, and titanium.

Understanding the nature of these fires is crucial for effective firefighting, as traditional methods of extinguishment such as water or foam are ineffective and can even exacerbate the situation. For example, water can react violently with certain metals, leading to explosive results.

The other classifications of fires involve different substances: Class A fires typically include ordinary combustibles like wood and paper, Class B fires involve flammable liquids, Class C fires relate to energized electrical equipment, and Class K fires are associated with cooking oils and fats. Thus, the specific characteristic of Class D fires being the involvement of combustible metals distinguishes them from these other classes.