Model 252 Model 252 FFFP FOAM adds class B fire fighting capability to the class A effectiveness of this extinguisher. The Alcohol Resistant fire fighting agent is effective on fires in a wide variety of class B materials such as alcohols, polar solvents, hydrocarbons, and combinations such as gasohol. Apply to a non-ignited class B liquid spill and it will seal the surface minimizing the chance of serious fire.