Octadecyl isocyanate is primarily used as a chemical intermediate in the production of various polymers and coatings. It is commonly employed in the synthesis of polyurethane, where it reacts with polyols to form durable and flexible materials. These polyurethanes are widely utilized in the manufacturing of adhesives, sealants, and coatings, providing excellent resistance to water, chemicals, and abrasion. Additionally, octadecyl isocyanate is used in the modification of surfaces to impart hydrophobic properties, making it valuable in creating water-repellent coatings for textiles, paper, and other materials. Its long hydrocarbon chain contributes to enhancing the stability and performance of the final products in industrial and commercial applications.