Fire extinguishing refers to the extinguishing of a fire. The chemical powder extinguisher is nowadays used for pretty much any type of fire, however appropriate fire extinguishing assumes analysing the fire class first, and then selecting a (environmentally harmless) extinguishing agent.

Fire classes

Comparison of fire classes
Class A Class B Class C Class D
Ordinary combustibles Flammable liquids Flammable gases Combustible metals
wood, paper, textile, artificial materials gasoline, diesel, petroleum, paint thinner propane, butane magnesium, natrium, potassium, aluminum, alloys

Appropriate extinguishers depending on fire class

How the agents extinguish the fire

Fire triangle
How the agents extinguish the fire
Extinguishing agent Cooling Expelling of oxygen Negative catalysis
water very good good no
water + foam good very good no
powder no good yes (good)
CO² no very good no
FM 200 no no yes (very good)
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