Butyl 3-mercaptopropionate is widely used in the polymer industry as a chain transfer agent. It helps control the molecular weight of polymers during the polymerization process, ensuring the production of materials with desired properties. This chemical is particularly valuable in the synthesis of acrylic polymers and resins, where it improves processability and enhances the final product's performance. Additionally, it is employed in the production of adhesives, coatings, and sealants, contributing to their durability and flexibility. Its ability to act as a sulfur donor also makes it useful in certain chemical reactions and organic synthesis processes.