Bromopolystyrene is widely used as a flame retardant in various polymer materials. The bromine content provides effective fire resistance by releasing bromine radicals during combustion, which interrupt the flame propagation process. It is commonly incorporated into plastics, textiles, and electronic enclosures where thermal stability and reduced flammability are critical.

It also serves as a reactive intermediate in organic synthesis and polymer chemistry. Due to the presence of bromine groups, it can undergo further chemical modifications such as coupling reactions, making it useful in the preparation of functionalized polymers and specialty resins.

In addition, bromopolystyrene is employed in the manufacturing of ion-exchange resins and as a crosslinking agent in certain resin systems. Its ability to participate in electrophilic reactions enhances its utility in developing materials with tailored chemical and mechanical properties.