Synthetic rubbers Sbr 1500, 1502, 1712 and 1705 Butyl rubber bk 1675 Polybutadiene rubber br 1220 [iran] Polybutadiene rubber nd [russia] Bromo butyl rubber [bbk 232] Chloro butyl rubber [cbk] Acrylonitrile rubber [nbr] Epdm Reclaim rubber Synthetic petroleum rubber Sodium butadiene rubber Chloroprene rubber Hsr 1904.