For polar solvents hazards, the required foam concentrate percentage is what?

For polar solvents hazards, the required foam concentrate percentage is what?

• A. 4%
• B. 6%
• C. 5%
• D. 7%

Answer: (B)

Polar solvents pose a tougher extinguishing challenge because they mix with water and can quickly degrade ordinary foam blankets. Alcohol-resistant foams designed for polar solvents require a higher concentrate to form a stable film and maintain vapor suppression, so the recommended application is 6%. This ensures the foam blanket remains intact on spills of polar solvents and provides effective cooling and separation of the fuel from the air. Lower concentrations are typically associated with hydrocarbon fuels, while 7% is above the common standard for these applications.

Polar solvents pose a tougher extinguishing challenge because they mix with water and can quickly degrade ordinary foam blankets. Alcohol-resistant foams designed for polar solvents require a higher concentrate to form a stable film and maintain vapor suppression, so the recommended application is 6%. This ensures the foam blanket remains intact on spills of polar solvents and provides effective cooling and separation of the fuel from the air. Lower concentrations are typically associated with hydrocarbon fuels, while 7% is above the common standard for these applications.