Enprene 655 Clear Styrene butadiene styrene Enchuan Styrene block copolymer (SBC) >> Styrene butadiene styrene rubber, SBS SEALANT ADHESIVE >> Solvent based >> Contact adhesive Styrene Butadiene styrene thermoplastic elastomer. Enprene 655 Clear provides strength, tackiness and elasticity for a variety of adhesives, from tapes and labels to contact adhesives and mastics. Butadiene/ styrene ratio: 60/40 Styrene butadiene styrene thermoplastic elastomer. Used for a variety of adhesives and mastics. Provides strength, tackiness and elasticity. Butadiene/styrene ratio: 60/40.