Used as a surface treatment agent to improve adhesion between organic and inorganic materials, especially in coatings, sealants, and composite materials. Enhances water repellency and durability of glass, minerals, and metals by forming a hydrophobic layer. Commonly applied in the production of silane coupling agents for rubber, adhesives, and fiberglass reinforcement. Also serves as an intermediate in the synthesis of organosilicon compounds for specialty chemicals and functional materials.