What type of foam should be used on polar solvents?

The most appropriate type of foam for use on polar solvents is Alcohol Resistant Aqueous Film Forming Foam (AR-AFFF). This type of foam is specifically formulated to combat fires involving polar solvents, which are typically alcohols and similar substances that are water-miscible.

Polar solvents can dissolve traditional foams, such as AFFF, which do not have the necessary characteristics to create an effective barrier against these types of fuels. AR-AFFF includes additives that make it resistant to the solubilization effects of polar solvents, allowing it to maintain its effectiveness even in challenging conditions. This foam forms a stable film on the surface of the liquid, effectively preventing vapor release and suppressing the fire hazard.

Using AR-AFFF is crucial for safety and effectiveness in fire suppression scenarios involving polar solvents, ensuring that the fire is managed properly and minimizing the risk of re-ignition. Other foam types generally do not provide the same level of protection and are not designed to handle the unique properties of polar solvents.