What is the function of AFFF's vapor-excluding film on hydrocarbon fuels?

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Multiple Choice

What is the function of AFFF's vapor-excluding film on hydrocarbon fuels?

Explanation:
The film’s job is to reduce vapor release from the fuel. The vapor-excluding film created by AFFF blankets the surface of hydrocarbon fuels, forming a barrier between the liquid and the air. That barrier slows or stops evaporation, so fewer flammable vapors reach the atmosphere. With lower vapor formation, the risk of ignition from vapors decreases and the foam blanket can more effectively control and cool the fire.

The film’s job is to reduce vapor release from the fuel. The vapor-excluding film created by AFFF blankets the surface of hydrocarbon fuels, forming a barrier between the liquid and the air. That barrier slows or stops evaporation, so fewer flammable vapors reach the atmosphere. With lower vapor formation, the risk of ignition from vapors decreases and the foam blanket can more effectively control and cool the fire.

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