Used as a key component in the formulation of fluorinated surfactants for fire-fighting foams, particularly in aqueous film-forming foam (AFFF) systems. Its strong surface activity and thermal stability allow it to effectively suppress flammable liquid fires by forming a film that prevents oxygen contact and fuel vapor release. Also utilized in specialized coatings and materials requiring extreme water, oil, and stain resistance due to its highly fluorinated structure. Commonly found in industrial and military firefighting applications where rapid fire knockdown and vapor suppression are critical.