Which foam is formulated so polar solvents do not dissolve the foam?

Which foam is formulated so polar solvents do not dissolve the foam?

• A. Aqueous Film Forming Foam
• B. Fluoroprotein Foam
• C. Protein Foam
• D. Alcohol-Resistant Foam

Answer: (D)

Foam concentrates differ in how well they stand up to polar solvents like alcohols. Alcohol-Resistant Foam is designed with additives that form a protective barrier, so polar solvents do not dissolve the foam. This lets the foam maintain its blanket and film on the fuel surface even when alcohols or other polar solvents are present, which is crucial for fires involving polar solvents or ethanol/methanol blends. The other foams aren’t formulated to resist dissolution by polar solvents, so their effectiveness declines in those conditions.

Foam concentrates differ in how well they stand up to polar solvents like alcohols. Alcohol-Resistant Foam is designed with additives that form a protective barrier, so polar solvents do not dissolve the foam. This lets the foam maintain its blanket and film on the fuel surface even when alcohols or other polar solvents are present, which is crucial for fires involving polar solvents or ethanol/methanol blends. The other foams aren’t formulated to resist dissolution by polar solvents, so their effectiveness declines in those conditions.