What is the typical mixture ratio for class B foam?

Answer: B — 1 to 6 percent

The typical mixture ratio for Class B foam is generally between 1 to 6 percent, which indicates that for every 100 gallons of water, 1 to 6 gallons of foam concentrate are added. This range is effective for extinguishing flammable liquid fires, as it allows for the creation of a sufficient foam blanket that smothers the fire, preventing re-ignition and cooling the surrounding surfaces. Using a mixture ratio of 1 to 6 percent ensures that the foam solution has enough strength and concentration to generate a proper foam application that can effectively control and suppress the fire. This ratio is widely accepted in the firefighting community and is utilized in training and operational protocols involving Class B foam applications.