Which type of foam is effective against hydrocarbon fires?

Film-forming foam is specifically designed to combat hydrocarbon fires, which involve flammable liquids like gasoline, oil, and other petroleum products. This type of foam works by creating a film on the surface of the burning liquid, thereby separating the fire from the oxygen in the air and preventing the release of flammable vapors. This film also helps to cool the surface and can suppress reignition of the fire.

Film-forming foam is tailored to be effective in a variety of scenarios involving hydrocarbon fires, which are characterized by their high flammability and tendency to spread rapidly. In contrast, other types of foam may not provide the same level of effectiveness in managing hydrocarbon fires. For instance, protein foams are more suitable for polar solvents and may not offer the same level of protection against hydrocarbons. Foam concentrates, while versatile, do not inherently provide the film-forming characteristics necessary for optimal hydrocarbon fire suppression. Water foam relies on water for suppression, which can be ineffective for ignitable liquids that float on water.

Understanding the unique properties of film-forming foam is crucial for fire safety professionals when selecting the appropriate extinguishing agent for different types of fires.