What is the general range of solution percentage for Class B foam?

Class B foam is designed for use on flammable liquid fires, and its effectiveness depends on the correct concentration of the foam solution. The general range of solution percentage for Class B foam typically falls between 3% and 6%. This means that when using Class B foam, the solution is usually mixed at a concentration of 3% to 6% foam concentrate with water to create an effective firefighting agent.

At these percentages, the foam can properly suppress flames, create a vapor barrier, and enhance the firefighting process on hydrocarbons and other flammable liquids. Solutions below this range may not provide adequate coverage or performance, while those above this range may lead to excess foam production and inefficient use of the concentrate.

Understanding this correct concentration is important for firefighters to ensure that they are using the foam effectively and safely during operations involving flammable liquids.