Phenethyltrichlorosilane is primarily used as a coupling agent in the production of silicone polymers and resins. It is applied to enhance the adhesion between organic and inorganic materials, making it valuable in coatings, adhesives, and sealants. In the electronics industry, it is utilized for surface treatment of glass, metals, and ceramics to improve their compatibility with organic polymers. Additionally, it serves as a key intermediate in the synthesis of specialized silicone compounds for high-performance materials. Its ability to form stable bonds with substrates makes it effective in creating water-repellent and corrosion-resistant surfaces.