Foam Transition Guidance Document (WP-24-10)

Aqueous film-forming foams (AFFFs) are a type of firefighting foam that are formulated using fluorosurfactants (i.e., PFAS) for extinguishment of flammable liquid fires, which are classified as Class B fires (National Fire Protection Association [NFPA] 2018). AFFF was brought to the market in the 1960s and has been used at…