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Class
A - Wood, paper, cloth, trash, plastics
Solid combustible materials that are not metals.
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Class
B - Flammable liquids: gasoline, oil, grease, acetone
Any non-metal in a liquid state, on fire. This classification
also
includes flammable gases.
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Class
C - Electrical: energized electrical equipment
As long as it's "plugged in," it would be considered
a class C fire.
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
classifications of fire the extinguisher is designed to fight.
For
example, a simple water extinguisher might have a label like
the one
below, indicating that it should only be used on Class A fires.
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