Which fire class is AFFF specifically designed for?

Aqueous Film Forming Foam (AFFF) is specifically designed for combating Class B fires, which involve flammable liquids such as gasoline, oil, and solvents. AFFF works by creating a foam blanket that suppresses the flammable vapors, preventing ignition and allowing for effective control of the fire. The foam also has the ability to cool the surface and protect against re-ignition, making it particularly effective in situations where flammable liquids are present.

While Class A fires involve ordinary combustibles like wood and paper, AFFF is not primarily engineered for those situations. Class C fires involve energized electrical equipment, where the use of AFFF could pose safety risks due to the possibility of electrical shock. Class D fires involve combustible metals, which require specialized extinguishing agents. Therefore, AFFF’s formulation and application are specifically tailored to address the unique challenges presented by Class B fires.