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en.wikipedia.org/wiki/Fire_extinguisher

... or potassium citrate) extinguishes the fire by forming an air-excluding soapy foam blanket over the burning oil through the chemical process of saponification ( an alkali reacting with a fat to form a soap) and by the water content cooling the oil below its ignition temperature.

www.scientificamerican.com/article/what-chemicals-are-used-i

By international agreement, however, production of all types of halons ceased in 1994 because the bromine and chlorine atoms in the chemical were found to migrate over time to the stratosphere, where they react to deplete ... Many fire extinguishing systems are built into the building or other structure being protected .

homeguides.sfgate.com/ingredients-fire-extinguisher-94660.html

Mono ammonium phosphate is a dry chemical used in Class A, B and C fire extinguishers. It is nonconductive, but corrosive, so it must be cleaned up soon after extinguishing the fire. Sodium bicarbonate is another dry chemical used in fire extinguishers, but is meant for extinguishing B and C fires. It is a nontoxic, ...

www.ehow.com/info_8633055_chemical-composition-fire-extinguishers.html

Not all fire extinguishers are the same. They contain a variety of chemicals to fight different kinds of fires. (Image: Hemera Technologies/AbleStock.com/Getty Images). Different types of fire extinguishers employ any of a variety of chemicals. These chemicals vary in how effective they are for certain kinds of fires, such as ...

www.chemistryislife.com/the-chemistry-of-a-fire-extinguisher

My life has never been affected by a fire extinguisher but there are millions of people that have been saved by fire extinguishers. Composition of ... The foam fire extinguishers use the foam to cover the whole fire and smother it, taking away the air so the fire can not keep on burning. It is made of Diethylene Glycol Monobutyl ...

www.quora.com/What-is-the-chemical-composition-of-a-fire-extinguisher

There are several common ingredients in commercially available Portable Fire Extinguishers. In the U.S. they all bear a U.L. Label which describes the contents, and the “Rating” as to type of burning material (and electrical involvement) and the size of fire (defined by U.L. testing procedures) on which the extinguisher has  ...

www.femalifesafety.org/types-of-extinguishers.html

Dry Chemical fire extinguishers extinguish the fire primarily by interrupting the chemical reaction of the fire triangle. Today's most widely used type of fire extinguisher is the multipurpose dry chemical that is effective on Class A, B, and C fires. This agent also works by creating a barrier between the oxygen element and the ...

www.madehow.com/Volume-1/Fire-Extinguisher.html

The hand-held fire extinguisher is simply a pressure vessel from which is expelled a material (or agent) to put out a fire. .... Many specialized dry chemical extinguishers are also suitable for burning metal fires, or Class D. ... Unlike CO 2 "snow," water, foam, and dry chemicals can ruin otherwise undamaged components.

home.howstuffworks.com/home-improvement/household-safety/fire/question346.htm

Dry chemical fire extinguishers are by far the most common fire extinguishers in the home. They can handle all three types of fires you would find in a kitchen or workshop: combustible solids like wood or paper, combustible liquids like gasoline or grease, and electrical fires. The idea behind a dry chemical fire extinguisher is ...