Styrene - butadiene - styrene block copolymer (SBS) is the largest yield of SBCs (accounting for more than 70%), the lowest cost, a widely used variety, is based on styrene, butadiene as monomer triblock copolymer, both plastic and rubber characteristics, known as the "third generation of synthetic rubber.Similar to styrene butadiene rubber, SBS can contact with water, weak acid, alkali and so on, with excellent tensile strength, large surface friction coefficient, good low temperature performance, excellent electrical performance, good processing performance and other characteristics, become the largest consumption of thermoplastic elastomer.