What type of fire extinguisher would be found mostly in chemical laboratories?

In chemical laboratories, the most appropriate type of fire extinguisher is the Type D fire extinguisher. This type of extinguisher is specifically designed to combat fires that involve combustible metals, which can be particularly prevalent in laboratory settings where certain chemicals or substances are used.

Type D fire extinguishers use dry powder agents that effectively smother metal fires, preventing them from spreading and allowing for more effective control. In contrast, the other types of extinguishers are geared towards different fire classes: Type A is for ordinary combustibles like paper and wood; Type B is for flammable liquids; and Type C is for electrical fires. These cannot adequately address fires fueled by combustible metals, highlighting the importance of having Type D extinguishers in environments where such materials are present.