Which classification of portable fire extinguisher is intended for fires involving combustible metals and alloys?

The classification of portable fire extinguishers designed specifically for fires involving combustible metals and alloys is Class D. This type of extinguisher is essential because fires fueled by combustible metals, such as magnesium, titanium, and sodium, require specialized extinguishing agents that can effectively smother the intense flames and prevent re-ignition.

Class D extinguishers typically use dry powder agents that are effective on these specific fires. Using water or other common extinguishing methods could exacerbate the situation, as they might react violently with the burning metal.

Understanding the unique needs of different classes of fire is important for fire safety and effective fire response. This is why it's crucial to have Class D extinguishers readily available in environments where combustible metals are present, such as metalworking facilities or laboratories.