Trimethoxy(octadecyl)silane is widely used as a surface modifier to impart hydrophobic properties to various materials. It is commonly applied in the treatment of glass, ceramics, and metals to create water-repellent surfaces, which are useful in automotive, construction, and electronic industries. The compound is also employed as a coupling agent in polymer composites, enhancing the adhesion between organic polymers and inorganic fillers. In coatings, it improves durability and resistance to environmental factors such as moisture and UV radiation. Additionally, it is utilized in the production of self-cleaning surfaces and anti-fogging applications, making it valuable in both industrial and consumer products.