American Chemical Society (ACS) Laboratory Safety Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

A "Class-D" fire extinguisher is used for fires involving what?

Flammable liquids

Electrical equipment

Combustible metals

Class-D fire extinguishers are specifically designed for extinguishing fires that involve combustible metals such as magnesium, titanium, potassium, and sodium. These metals ignite at very high temperatures and can react violently with water and other common extinguishing agents. Class-D extinguishers typically contain dry powder agents that smother the flames and form a barrier between the fuel and the oxygen, effectively putting out the fire without causing a hazardous reaction.

Understanding this specialization is crucial in laboratory safety, as using the wrong type of extinguisher on a Class-D fire can exacerbate the situation, potentially leading to explosive reactions or further spread of the fire. This makes it imperative to know the characteristics of the materials being dealt with in order to select the appropriate fire suppression method.

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Organic materials

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