Butyltriethoxysilane is primarily used as a coupling agent in the production of various materials. It enhances the adhesion between organic polymers and inorganic substrates, making it valuable in coatings, adhesives, and sealants. In the construction industry, it is applied to improve the water repellency and durability of concrete, masonry, and other building materials. It also acts as a surface modifier in the manufacturing of composites, ensuring better compatibility and performance of the final product. Additionally, it is utilized in the preparation of silica-based materials and as a precursor in sol-gel processes for creating advanced ceramics and coatings with tailored properties.