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sebs polymer sebs plastic sebs block copolymer sebs resin sebs rubber tpe styrenic block copolymers sebs material styrene ethylene butylene styrene block copolymer thermoplastic elastomers sbs rubber sbs copolymer sbs polymer sbs resin styrene ethylene butylene styrene copolymer sis block copolymer seps polymer star thermoplastics thermoplastic rubber tpe plastic thermoplastic rubber compound