Definition of Synthetic Butyl Rubber (SBR)

A synthetic rubber produced by copolymerisation of a butylene with isoprene, nearly impermeable to air and used in tyres and tyre inner tubes.

Synthetic rubber is man-made and is produced around the world in manufacturing plants that synthesize it from petroleum and other minerals. Around 60 per cent of rubber used in tyres is synthetically manufactured. Synthetic rubber is chemically designed to offer specific physical properties and performance attributes.