1,3-Diethylurea is primarily used as an intermediate in the synthesis of various chemical compounds. It plays a significant role in the production of pharmaceuticals, where it is utilized to create active ingredients for medications. Additionally, it is employed in the development of agrochemicals, contributing to the formulation of herbicides and pesticides that enhance crop protection. In industrial applications, 1,3-Diethylurea is used in the manufacture of polymers and resins, where it acts as a stabilizing agent or cross-linking component. Its versatility also extends to research laboratories, where it serves as a reagent in organic synthesis experiments.