Which is an appropriate use for Class B foam?

Class B foam is specifically formulated to suppress flammable liquid fires and can be extraordinarily effective in preventing the ignition of vapors produced by unignited fuel spills. When applied to an area with spilled fuel, the foam creates a film that prevents vapor from escaping into the atmosphere, reducing the risk of ignition and ultimately enhancing safety at the incident scene.

Using Class B foam in situations involving unignited fuel spills helps to not only minimize fire risk but also assists in controlling the hazardous environment that could lead to a significant fire incident. This makes it a critical tool in managing spills of flammable liquids effectively.

While pretreating threatened structures in wildland fires, improving water penetration of tightly-packed fuels, and saponification of cooking oils and greases are important considerations in fire suppression, they pertain to other methods or agents. Wildland fires often require different suppression techniques and agents tailored for vegetation rather than Class B foam, and specific approaches for cooking oils and greases fall under cooking fire suppression tactics that rely on different materials, such as Class K agents.