What fire extinguisher classification is needed for combustible metals?

The fire extinguisher classification required for combustible metals is Class D. This category specifically addresses fires involving combustible metals such as magnesium, titanium, and sodium, which react differently to fire than other materials. Class D extinguishers are designed to extinguish these types of fires using agents that do not react with the burning metals and are often dry powders tailored to smother or separate the fuel from the oxygen needed for combustion.

Understanding why this classification is distinct is essential, as using the wrong type of extinguisher on a combustible metal fire can lead to explosive reactions, worsening the situation rather than controlling it. In contrast, Class B extinguishers are suited for flammable liquids, Class C is for electrical fires, and Class K is specifically intended for cooking oils and fats, denoting a clear differentiation in application based on the materials involved in the fire.