Tetra-n-hexylammonium perchlorate is primarily used in research and industrial applications as a phase-transfer catalyst. It facilitates the transfer of reactants between immiscible phases, such as aqueous and organic solvents, enhancing reaction efficiency in organic synthesis. This compound is also employed in electrochemical studies, particularly in the preparation of electrolytes for non-aqueous systems. Its stability and ionic properties make it suitable for use in advanced material science, including the development of ionic liquids and conductive polymers. Additionally, it finds application in the field of analytical chemistry for ion-pair chromatography, aiding in the separation and analysis of complex mixtures.