What are the three extinguishing properties of foam?

The foam blankets the fuel surface smothering the fire. The foam blanket separates the flames/ignition source from the fuel surface. The foam cools the fuel and any adjacent metal surfaces. The foam blanket suppresses the release of flammable vapors that can mix with air.

What is necessary when applying fire fighting foam?

apply more foam than necessary for extinguishment. apply a solid or straight stream of water to the foam blanket. Most fire fighting foams are intended to be mixed with: 80 to 90 percent water.

Which type of foam would be used to extinguish a fire involving polar solvent fuels?

AFFF-AR foams
On polar solvent fires, AFFF-AR foams are used. Polar solvents fuels are miscible with water and destroy the foam blanket. That’s why AR-AFFF foams contain polymers to form a barrier between the fuel surface and the foam blanket. This barrier protects the foam blanket from destruction by the polar solvent.

Is fire suppression foam toxic?

Firefighting foam contains numerous toxic chemicals known as “forever chemicals.” These chemicals do not break down quickly and stay around for a long time. They are linked to a variety of chronic and disabling illnesses and conditions, especially cancers.

How does DCP extinguish a fire?

Dry chemical powder put out the fire by coating the burning material with a thin layer of dust, thus separating the fuel from the oxygen in the air. The powder also works to interrupt the chemical reaction of fire, so these extinguishers are extremely effective at putting out the fire.

What is an advantage of using a foam nozzle to apply fire fighting foam?

By adding a foam attachment to the nozzle, air is injected into the solution, which helps you to create a much better bubble structure. Instead of running off like water tends to do, the foam blanket will smother a fire and stick to burning surfaces and pretty much everywhere that it is applied.

Which extinguishing agent is the best for use on electrical fires?

Class C fire extinguishers are the only type suitable for smothering the flames of a fire that is still connected to an electrical source.

What does AFFF foam do?

Aqueous film forming foam (AFFF) is a highly efficient type of fire suppressant agent, used by itself to attack flammable liquid pool fires, and in conjunction with Halon 1301 to attack fires in Navy vessel machinery spaces.

What is FFFP foam?

Film-forming fluoroprotein (FFFP) foam is a combination of fluorochemical surfactants with protein foam. These are designed to combine the fuel tolerance and burn-back resistance of a fluoroprotein foam with an increased knockdown power.