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Aqueous film-forming foam (AFFF) is commonly utilized in fire extinguishment due to its unique properties that enhance fire suppression, particularly for flammable liquid fires. When applied, AFFF creates a film that spreads across the surface of the burning liquid, effectively smothering the flames and preventing oxygen from reaching the fire. This film also helps to cool the surface and can suppress the release of flammable vapors, which is critical in preventing re-ignition.

The effectiveness of AFFF is especially apparent in situations involving hydrocarbons, such as gasoline or diesel fuel. Its ability to form a film atop burning surfaces allows for rapid extinguishment and control of the fire, making it a preferred choice among firefighting agents. Additionally, it is designed to be used with various delivery systems, including hand-held extinguishers and larger fire suppression systems.

The other types of foam listed do not possess the specific qualities that make AFFF ideal for effective firefighting, particularly in scenarios involving flammable liquids. Consequently, Aqueous film-forming foam stands out as the most suitable agent for extinguishing such fires.