What concentrate is typically used for polar solvents in older technology?

The correct choice refers to the appropriate concentration of foam concentrate used to combat fires involving polar solvents, particularly in older fire suppression technology. A 6% foam concentrate is specifically designed to effectively deal with flammable liquids known as polar solvents, which have lower surface tension and can mix with water. This concentration allows for a more effective formation of a stable foam that can cover the fuel surface and prevent the release of flammable vapors, which is critical for fire control and extinguishment.

Older technology typically involves using Class B foams, and foams formulated for polar solvents require a higher percentage concentration compared to those used for non-polar solvents. The 6% concentration is specifically engineered to create a thicker foam blanket necessary for these types of fires. It's recognized for its ability to adhere to the surfaces and form a protective barrier more effectively than lower concentration foams in situations involving polar solvents. The understanding of this specific application is crucial for facility fire brigades in ensuring safety during fire emergencies.