1,3-Diallylurea is primarily used in the synthesis of polymers and resins. It serves as a cross-linking agent in the production of thermosetting plastics, enhancing their durability and thermal stability. This compound is also utilized in the development of adhesives and coatings, where it improves bonding strength and resistance to environmental factors. Additionally, it finds application in the creation of hydrogels for biomedical purposes, such as drug delivery systems and wound dressings, due to its biocompatibility and ability to form stable networks. In the field of agriculture, it is employed in the formulation of slow-release fertilizers, ensuring a controlled nutrient supply to plants.