YUSHENG Bromo butyl rubber BIIR is a copolymer rubber of bromo isobutylene and isoprene. It is derived from halogenating butyl rubber with bromine in a continuous process. Bromo butyl rubber possesses other fundamental advantages including stability at high... moreBromo butyl rubber BIIR is a copolymer rubber of bromo isobutylene and isoprene. It is derived from halogenating butyl rubber with bromine in a continuous process. Bromo butyl rubber possesses other fundamental advantages including stability at high temperatures, rejuvenating capabilities, stronger resistance, increased adhesion to other rubbers and metals, and lastly, improved ozone and environmental resistance.