What is one function of Class B foam?

One key function of Class B foam is its ability to provide alcohol-resistant properties, which makes it especially effective for suppressing flammable liquids that are polar in nature, such as alcohols. Class B foams are specifically formulated to create a barrier on the surface of burning liquids, preventing the release of flammable vapors and enhancing firefighting effectiveness.

The alcohol-resistant characteristic allows Class B foam to be used in situations where standard foams might fail to form an effective blanket over alcohol fuels. Traditional foams can be compromised when in contact with polar solvents, but alcohol-resistant Class B foam maintains its stability and effectiveness under these challenging conditions.

This specific function highlights the importance of understanding foam characteristics, especially in scenarios involving hazardous materials, as it helps firefighters choose the right type of foam for effective fire suppression.