US Patent 11883704 Fire-fighting foam concentrate

An aqueous concentrate, which can be diluted with an aqueous diluent to form a foam precursor composition, is provided. The foam precursor composition may be aerated to form a firefighting foam. The present aqueous firefighting concentrates include a surfactant component, which includes one or more of an anionic surfactant, a zwitterionic surfactant and a nonionic surfactant and an aliphatic alcohol-based component. The aliphatic alcohol-based component typically includes at least two alcohols and/or alcohol ethoxylates. The aqueous concentrates contain a substantial amount of water and typically are substantially free of any fluorinated compound.