Aqueous film forming foam (AFFF) is a firefighting foam that military and civilian fire departments have used to combat flammable liquid fires, such as gasoline, oil, and jet fuel.
Firefighting foam was found to be highly effective in suppressing fires and preventing re-ignition.
AFFF was extensively used in industrial, military, and aviation settings due to its effectiveness in fighting fires involving hazardous materials incidents and basic military training exercises.
How Aqueous Film-Forming Foam (AFFF) Works:
- Film Formation: When users spray AFFF onto a fire, the foam forms a thin aqueous film that spreads over the surface of the flammable liquid, creating a barrier between the fuel and the oxygen in the air.
- Smothering Action: The foam blankets the fuel, minimizing the supply of fuel and oxygen to the fire, which is essential for combustion.
- Cooling Effect: AFFF has a cooling effect on the fire, reducing the temperature and aiding in extinguishment.
- Suppression of Flammable Vapors: AFFF suppresses flammable vapors that can ignite and spread the fire, preventing the vapors from escaping and igniting, thereby reducing the risk of re-ignition.
AFFF is often stored in large containers or firefighting equipment, such as fire trucks or fixed firefighting systems.