|Class A - Wood, paper, cloth, trash, plastics |
- Solid combustible materials that are not metals.
Class B - Flammable liquids: gasoline, oil, grease, acetone
- Any non-metal in a liquid state, on fire.
Class C - Electrical: energized electrical equipment
Class D - Metals: potassium, sodium, aluminum, magnesium
Unless you work in a laboratory or in an industry that uses these materials, it is unlikely you'll have to deal with a Class D fire. It takes special extinguishing agents (Metal-X, foam) to fight such a fire. Most fire extinguishers will have a pictograph label telling you which fuels the extinguisher is designed to fight. For example, a simple water extinguisher might have a label like the one shown in the left hand column, indicating that it should only be used on Class A fuels.