towalex AFFF 3% EX is an aqueous film forming foam concentrates (AFFF) based on fluoro-surfactants, hydrocarbon tensides and glycolethers for use at 3% concentration.AFFF is a synthetic concentrate comprised of detergent and fluorocarbon surfactant that form a foam with the inherent ability to produce a vapor suppressing aqueous film on the surface of the hydrocarbon fuels.