Quintac 3421 SIS block copolymer 25038-32-8 Zeon Chemical Styrene block copolymer (SBC) >> Styrene isoprene rubber, SIS ADHESIVE >> Hot-melt ADHESIVE >> Hot-melt >> Pressure sensitive (HMPSA) Quintac 3421 is a Styrene-Isoprene-Styrene block copolymer. Middle SI Diblock Zeon's Quintac SIS Block Copolymers with polystyrene end blocks and polyisoprene mid blocks are designed for use in hot melt pressure sensitive adhesives, hot melt adhesives and flexographic printing plates. Styrene-isoprene-styrene block copolymer with polystyrene end blocks and polyisoprene mid blocks. Possesses middle SI diblock. Used in hot melt pressure sensitive adhesives and hot melt adhesives.