Which type of foam concentrate is used for fighting fires on water-soluble materials and other fuels destructive to regular, AFFF, or FFFP foams?

• A. Alcohol-resistant foam concentrate
• B. Aqueous film-forming foam concentrate
• C. Film-forming fluoroprotein foam concentrate
• D. Protein foam concentrate

Answer: (A)

Alcohol resistance of foam concentrates is the key idea. When a fire involves water-soluble materials or fuels that would destroy ordinary foams, you use an alcohol-resistant foam. These concentrates include additives that form a protective layer and resist the dissolving action of polar solvents like alcohols, allowing the foam to blanket the liquid surface and maintain its film barrier. That stability is crucial because regular AFFF or other foams can break down in the presence of alcohols, reducing effectiveness on these fuels. Protein foams also lack reliable alcohol resistance, and even some fluorinated foams aren’t guaranteed to perform with polar solvents unless specifically formulated as alcohol-resistant. By using an alcohol-resistant foam, the extinguishing action remains effective for fuels that are destructive to standard foams.