Which type of extinguisher is appropriate for combustible metals such as titanium and magnesium?

The appropriate extinguisher for combustible metals, such as titanium and magnesium, is a Class D extinguisher. Class D extinguishers are specifically designed to extinguish fires involving combustible metals, which behave differently than common materials. These substances require special extinguishing agents that can effectively put out such fires without reacting with the metals themselves.

Class D extinguishers typically use dry powder agents that smother the fire and prevent it from spreading, making them essential in environments dealing with flammable metals, such as laboratories or manufacturing facilities that handle materials like magnesium or sodium.

Other classes of extinguishers are not suitable for metal fires. Class A extinguishers are for ordinary combustibles like wood and paper, Class B extinguishers target flammable liquids like gasoline, and Class C extinguishers are geared towards electrical fires. Therefore, using the appropriate Class D extinguisher is critical for ensuring safety when dealing with fires involving combustible metals.