Class of Fire	Type of Combustible Material	How to Extinguish
A	(Class A fires generally leave an Ash.) Solid combustible materials that are not metals: examples: Paper, wood, plastic, trash	giant squirt gun.
B	(Class B fires generally involve materials that Boil or Bubble.) Any non-metal in a liquid state, on fire. This classification also includes flammable gases. examples: gasoline, oil, grease, acetone	Carbon dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. The pressure in the cylinder is so great that when you use one of these extinguishers, bits of dry ice may shoot out the horn.
C	(Class C fires generally deal with electrical Current.) As long as it's "plugged in," it would be considered a class C fire. examples: energized electrical equipment
D	Flammable metals examples: potassium, sodium, aluminum, magnesium	It takes special extinguishing agents (Metal-X, foam) to fight such a fire. Metal-X, foam = finely powdered sodium chloride (salt) propelled by argon. Very dry sand may be used to smother a metal fire if nothing better is available.