Diethyl 3,3'-thiodipropanoate is primarily used as a chemical intermediate in the synthesis of various organic compounds. It plays a significant role in the production of polymers and plastics, where it acts as an antioxidant and stabilizer to enhance the material's durability and stability. Additionally, it is utilized in the manufacturing of adhesives and coatings, providing improved resistance to environmental factors such as heat and chemicals. In the pharmaceutical industry, it serves as a precursor in the development of certain drugs, contributing to the creation of active pharmaceutical ingredients. Its applications also extend to the field of agriculture, where it is involved in the formulation of pesticides and herbicides, aiding in crop protection and yield improvement.