During product control, the foam used for polar solvents is

• A. Alcohol-resistant foam
• B. Aqueous film-forming foam
• C. Protein foam
• D. Fluorinated foam

Answer: (A)

The key idea here is that the type of foam must resist the particular solvent in the spill. Polar solvents, like acetone, methanol, and ethanol, can break down many foams that work on hydrocarbons. Alcohol-resistant foam is formulated to withstand those polar solvents, forming a stable blanket that protects the spill and helps control vapors and cooling during application. This makes it the best choice for product control involving polar solvents, because it maintains effectiveness where other foams may fail.

AFFF is designed mainly for nonpolar hydrocarbon fuels, so it doesn’t hold up as well against alcohols. Protein foams are older and generally less stable and less effective in the presence of polar solvents. Fluorinated foams are often used for hydrocarbon fires as well and don’t specifically address the challenges posed by polar solvents.