What is the standard mixing ratio for AFFF and water?

The standard mixing ratio for Aqueous Film-Forming Foam (AFFF) and water is indeed 97% water to 3% AFFF. This ratio is established for effective suppression of flammable liquid fires, particularly in situations where rapid extinguishment is crucial. The high water content helps to provide a significant volume of cooling and diluting capability, while the AFFF component functions to form a film, which suppresses the release of flammable vapors and aids in creating a barrier between the fuel and the air.

Using this specific concentration ensures that the foam adheres properly to liquid surfaces and can effectively smother fires, thereby reducing the risk of re-ignition. It’s essential for firefighting professionals to follow these guidelines to ensure they are using the most effective methods and materials to combat flammable liquid incidents efficiently.