Used as a coupling agent in composite materials, enhancing adhesion between organic polymers and inorganic surfaces such as glass, metals, and minerals. Commonly applied in coatings, adhesives, and sealants to improve durability and moisture resistance. Also utilized in the synthesis of hybrid organic-inorganic materials for specialty resins and surface treatments. Its triethoxysilyl group enables strong bonding to substrates through hydrolysis and condensation reactions, making it effective in primers and surface modifiers.