Styrene-Butadiene-Styrene Block Copolymer [SBS]

A synthetic rubber based on block copolymers having a rubber center block and two polystyrene end blocks, they combine the properties of a thermoplastic resin with those of butadiene rubber. The hard, glassy styrene blocks provide mechanical strength and improve the abrasion resistance, while the rubber mid-block provides flexibility and toughness. Widely used as a sealant bitumen roofing product.