Classes of Fires and Extinguishing Agents
| Fire Class |
Typical Occurrence Materials |
Extinguishing Techniques and Materials |
|---|---|---|
| CLASS A | Ordinary combustible materials, such as wood, cloth, and paper. | Water, special dry chemicals for use on Class A, B, and C fires. |
| CLASS B | Vapor-air mixtures over the surface of flammable liquids, such as grease, gasoline, and lubricating oils. | A smothering or combustion-inhibiting effect: dry chemical, foam, vaporizing liquids, carbon dioxide, and water fog. |
| CLASS C | Electrical equipment where non-conducting extinguishing agents should be used. | Dry chemical, carbon dioxide, and vaporizing liquids. Do not use foam, non-spray water, or water-type extinguishing agents. |
| CLASS D | Combustible metals, such as magnesium, titanium, zirconium, lithium, and sodium. | Specialized techniques, extinguishing agents, and equipment: Do not use normal extinguishing agents on metal fires because of the danger of increasing the intensity of the fire with a chemical reaction between extinguishing agents and the burning metal. |
Where a specific class fire extinguisher is recommended, an extinguisher rated for two or more classes may be used, provided one rating is the specified class. For instance, an Class ABC fire extinguisher meeting individual class ratings is adequate for most locations on a platform.
Knowledge Check Choose the best answer for the question.
6-4. Which type of fire extinguisher is most suitable for flammable liquid fires?
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