Octadecyl isocyanate is primarily used as a chemical intermediate in the synthesis of various organic compounds. It is commonly employed in the production of surface-active agents, which are essential in the formulation of detergents, emulsifiers, and dispersants. Additionally, it finds application in the creation of coatings and adhesives, where it enhances properties such as durability and adhesion. The compound is also utilized in the modification of polymers to improve their performance characteristics, including flexibility and resistance to environmental factors. In the field of organic synthesis, it serves as a building block for the preparation of more complex molecules, particularly those used in pharmaceuticals and agrochemicals. Its long alkyl chain contributes to the hydrophobic properties of the final products, making it valuable in applications requiring water repellency or moisture resistance.