Used as a fluorinated coupling agent in surface modification, enhancing water and oil repellency on textiles, paper, and electronic materials. Its epoxy group enables covalent bonding to substrates, providing durable hydrophobic and oleophobic coatings. Commonly applied in specialty coatings for medical devices, optical fibers, and semiconductor manufacturing where low surface energy and chemical stability are critical. Also utilized in formulations for stain-resistant finishes and anti-fouling layers due to its long perfluoroalkyl chain.