Didecylamine is primarily used as an intermediate in the synthesis of various chemical compounds, including surfactants and corrosion inhibitors. It finds application in the production of quaternary ammonium compounds, which are widely utilized in fabric softeners, disinfectants, and antimicrobial agents. Additionally, didecylamine is employed in the formulation of lubricants and fuel additives to enhance performance and reduce wear. Its properties also make it suitable for use in the development of agrochemicals, such as herbicides and pesticides, where it acts as a key building block. In industrial settings, it serves as a component in coatings and paints to improve adhesion and durability.