DOP-DEDA is primarily used as a stabilizer and plasticizer in the production of polymers, particularly PVC (polyvinyl chloride). It enhances the flexibility, durability, and thermal stability of PVC products, making it suitable for applications in cables, flooring, and synthetic leather. Additionally, it is employed in adhesives and coatings to improve their performance and longevity. Its compatibility with various resins and polymers makes it a versatile additive in industrial manufacturing processes.