Which type of Class B foam is recommended for use on car fires?

Aqueous Film-Forming Foam (AFFF) is recommended for use on car fires due to its effectiveness in dealing with flammable liquid fires, including those that can occur in vehicles due to the presence of gasoline, oil, and other combustibles. AFFF creates a film on the surface of the burning liquid, which helps to suppress the vapor and provides a barrier against re-ignition. This property is particularly beneficial in quickly extinguishing car fires by rapidly cooling and smothering the flames, ultimately reducing the risk of fire spread.

AFFF has a rapid knockdown capability, which is critical in vehicle fires that can escalate quickly. It is also compatible with various fuels found in cars, making it a versatile choice for first responders facing such emergencies. Thus, its characteristics and composition make AFFF the most suitable foam for effectively combating car fires compared to other foam types.