Which foam type is commonly used for polar solvents?

Which foam type is commonly used for polar solvents?

• A. Regular foam
• B. Alcohol-resistant foam
• C. AFFF
• D. Protein foam

Answer: (B)

Foam concentrates differ in how well they stand up to polar solvents. Fires involving polar solvents (like acetone, alcohols) weaken or destroy ordinary foam films, so you need a foam that resists that solvent attack. Alcohol-resistant foam has additives that form a protective barrier and keep the film intact in the presence of alcohols, allowing the foam to float, blanket the liquid, and suppress the flashover effectively. Regular foam and fluorinated hydrocarbon foams used for hydrocarbon fuels aren’t designed to resist polar solvents and can break down, reducing effectiveness. Protein foam also isn’t reliable against alcohols. So, for polar solvent fires, alcohol-resistant foam is the appropriate choice.

Foam concentrates differ in how well they stand up to polar solvents. Fires involving polar solvents (like acetone, alcohols) weaken or destroy ordinary foam films, so you need a foam that resists that solvent attack. Alcohol-resistant foam has additives that form a protective barrier and keep the film intact in the presence of alcohols, allowing the foam to float, blanket the liquid, and suppress the flashover effectively. Regular foam and fluorinated hydrocarbon foams used for hydrocarbon fuels aren’t designed to resist polar solvents and can break down, reducing effectiveness. Protein foam also isn’t reliable against alcohols. So, for polar solvent fires, alcohol-resistant foam is the appropriate choice.