2,2'-Dithiodipropionic acid is primarily used as a cross-linking agent in the polymer industry. It helps in enhancing the mechanical properties of polymers, making them more durable and resistant to environmental stress. This chemical is also employed in the synthesis of biodegradable polymers, contributing to the development of eco-friendly materials. In the field of biochemistry, it serves as a reagent for modifying proteins and peptides, aiding in the study of their structure and function. Additionally, it finds application in the production of adhesives and coatings, where it improves adhesion and stability. Its role in stabilizing certain pharmaceutical formulations further underscores its versatility in various industrial applications.