1,9-Diaminononane is primarily used as a building block in the synthesis of polymers, particularly polyamides and polyurethanes. Its long carbon chain and dual amine groups make it suitable for creating high-performance materials with enhanced flexibility and durability. It is also employed in the production of corrosion inhibitors, where it forms protective layers on metal surfaces to prevent degradation. Additionally, it serves as a crosslinking agent in epoxy resins, improving their mechanical and thermal properties. In the pharmaceutical industry, it is utilized as an intermediate in the synthesis of bioactive compounds and drug delivery systems. Its applications extend to the field of surfactants, where it contributes to the formulation of detergents and emulsifiers.