9-Chlorohexadecafluorononanoic Acid is used in the chemical industry as a starting material for producing fluorinated surfactants and coatings with water, oil, and stain repellent properties, particularly in textiles, synthetic leather, and surface coatings. It is also employed in the synthesis of fluoropolymers requiring special properties such as corrosion resistance and low adhesion. Its highly fluorinated structure, along with strong carbon-fluorine bonds, provides excellent thermal and chemical stability, making it suitable for harsh environments. However, due to environmental persistence and potential bioaccumulation concerns, its use and that of derived products are being phased out or replaced in many regions.