Diethyltoluenediamine is widely used as a curing agent in the production of polyurethane materials. It helps to enhance the mechanical properties, such as flexibility, durability, and resistance to wear and tear, making it suitable for applications in coatings, adhesives, and elastomers. Additionally, it is employed in the synthesis of epoxy resins, where it acts as a hardener to improve thermal stability and chemical resistance. Its use extends to industrial applications, including the manufacturing of automotive parts, sealants, and insulation materials, due to its ability to provide strong and resilient end products.