Used primarily as a crosslinking agent in polymer chemistry, especially in the synthesis of thermosetting resins and elastomers. It enables the formation of three-dimensional networks by reacting with unsaturated sites in polymer chains, enhancing thermal stability, mechanical strength, and chemical resistance. Commonly applied in the production of specialty rubbers and in controlled radical polymerization techniques like atom transfer radical polymerization (ATRP), where it acts as an initiator to regulate molecular weight and achieve narrow polydispersity. Its bifunctional bromine groups allow for efficient coupling reactions, making it valuable in designing well-defined polymers for coatings, adhesives, and advanced materials.