What percentage of foam is required for polar solvents?

The correct percentage of foam required for polar solvents is 6%. This specific concentration is crucial because polar solvents, such as alcohols and ketones, have unique combustion characteristics and are more challenging to extinguish than non-polar solvents. They can dissolve standard foam, making it less effective unless the foam is formulated for their specific characteristics.

Using a foam solution with a concentration of 6% ensures that the foam blanket is sufficient to provide effective coverage, form a durable seal over the liquid, and reduce the risk of flashback or reignition. The percentage indicates the foam's ability to mitigate the thermal hazards associated with the flames, ensuring a more successful firefighting operation in scenarios involving polar solvents. Understanding this ensures that responders are properly equipped and knowledgeable about the appropriate types of foam for various incidents, leading to safer and more effective firefighting strategies.