Used as a key intermediate in the synthesis of fluorinated surfactants and surface modifiers, particularly in electrochemical applications such as fuel cells. Its highly fluorinated structure provides excellent chemical and thermal stability, making it suitable for use in proton-exchange membranes where it helps improve proton conductivity and membrane durability. Also employed in specialty coatings to impart water, oil, and stain repellency on surfaces. Due to its unique amphiphilic nature, it stabilizes emulsions in fluoropolymer processing and is effective in firefighting foams where resistance to heat and harsh environments is critical.