AFFF, Fire extinguisher, what does it stand for?
AFFF – Aqueous film forming foams.
In the mid 1960s, the US Navy developed a fire fighting foam called AFFF which is short for aqueous film-forming foam.
This is synthetic foam with low viscosity that spreads rapidly across the surface of most hydrocarbon fuels.
A water film forms under the foam bubbles which cools the liquid fuel and will stop the formation of flammable vapors and provide a dramatic fire knockdown, an important factor in crash rescue fire fighting.
Aqueous film forming foams (AFFF) are water-based foams, frequently containing sodium alkyl sulphate, and/or perfluoro telomer as surfactants.
They have the ability to spread over the surface of hydrocarbon-based liquids.
Alcohol-resistant aqueous film forming foams (AR-AFFF) are foams resistant to the action of alcohols, able to form the protective film even in their presence .
AFFF is best for spills of jet fuels.
Low-expansion foams are foams with expansion rate lower than 20 times.
Foams with expansion ratio between 20-200 are medium expansion.
The low-expansion foams, eg. AFFF, are low-viscosity, mobile, able to quickly provide coverage of large areas.
Jewel Saffire Products Ltd 6L AFFF 144B Test Video
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