What is the typical reapplication interval for class B foam to maintain effectiveness?

The typical reapplication interval for class B foam to maintain effectiveness is generally 10 to 15 minutes. This time frame ensures that the foam maintains its blanket over the burning surface, suppressing flammable vapors and preventing re-ignition. Class B foam is particularly designed for use on flammable liquid fires and its effectiveness diminishes over time due to evaporation and heat from the fire. By reapplying within this interval, firefighters can ensure optimal performance and maintain safety protocols while effectively controlling the fire. This interval is established based on best practices and experience in the field to provide the best chances of extinguishing the fire without allowing it to flare up again.