Used as a coupling agent in composite materials to improve adhesion between organic polymers and inorganic fillers. Enhances dispersion of fillers in polymer matrices, leading to improved mechanical strength, thermal stability, and durability in plastics, rubber, and coatings. Commonly applied in sealants, adhesives, and fiberglass-reinforced composites. Also improves hydrolytic stability in wet environments, making it suitable for use in construction, automotive, and marine applications.