What is the primary function of Class B foam in firefighting?

The primary function of Class B foam in firefighting is to effectively separate the fuel from the fire, thereby interrupting the combustion process. This type of foam works by creating a blanket that covers the burning liquid, preventing vapors from escaping and reducing the amount of oxygen available for combustion. By separating the fuel from the fire, Class B foam reduces the likelihood of re-ignition and helps cool the surface to a certain extent, further aiding in fire suppression.

Furthermore, Class B foam is specifically designed for flammable liquids such as oil and gasoline, which might be found in incidents involving fuel spills or storage facilities. Its effectiveness in these scenarios makes it a critical tool for firefighters dealing with these types of fires.