Film formation

Aqueous film (AFFF effect)

The foam produces a very thin aqueous film an non polar liquids. This film floats ahead of the foam and provides for its excellent flowing, extinguishing and re-ignition inhibiting properties. The aqueous film also forms when using non aspirated foam concentrate solutions, e. g. in sprinkler systems, water monitors, spray nozzles etc..

Polymer film

The polymer film is produced by the polymer film formers contained in the foam when extinguishing polar hydrocarbons (e.g alcohols, ketones, ester). The film floats as an insulating protective layer between the foam destroying alcohol and the foam cover above. Only when the foam is applied gently a stable continuous polymer film is formed which provides effective protection against the foam destroying liquid.

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