1-Octylnaphthalene is primarily used as an intermediate in the synthesis of various organic compounds. It finds application in the production of surfactants and detergents due to its ability to modify surface tension and enhance the solubility of other substances. In the field of lubricants, it serves as an additive to improve the performance and stability of oils under high-temperature conditions. Additionally, it is utilized in the manufacturing of specialty chemicals, including dyes and pigments, where it acts as a solvent or dispersing agent. Its properties also make it suitable for use in research and development, particularly in studies involving organic synthesis and material science.