What is the correct percentage of AFFF concentrate in the final AFFF solution?

• A. 94%
• B. 6%
• C. 50%
• D. 0%

Answer: (B)

The key idea is that the final AFFF solution is formed by mixing a precise amount of concentrate with water. For standard AFFF systems, the correct mix puts six percent of the final solution as AFFF concentrate, with the remaining ninety-four percent being water. This six-percent ratio provides the intended foam performance, including proper film formation and fire suppression effectiveness.

Choosing a much higher percentage (like fifty percent) would overstiffen the mixture and alter performance, while zero percent would mean no foam at all. Conversely, ninety-four percent would describe the water portion, not the concentrate portion. So six percent is the correct concentrate fraction in the final solution.