Hwaprene^TM SIS is styrene-isoprene-styrene block copolymer in white porous pellet form. It is derived from anionic polymerization of styrene and isoprene. It is non-toxic thermoplastic elastomer, and is characterized by its high elasticity, good melting flowability, good compatibility with tackifiers and safety.

Typical items & technical data

Items	SIS 1015	SIS 1030	SIS 1116	SIS 1214	SIS 1516	SIS 1615	SIS 4319
Structure	Linear	Linear	Linear	Linear	Linear	Linear	Radial
Styrene content, %, by weight	15.0 ± 2.0	30.0 ± 2.0	16.0 ± 2.0	14.0 ± 2.0	16.0 ± 2.0	15.0 ± 2.0	19.0 ± 2.0
Diblock content, %, by weight	-	-	16.5 ± 2.0	25.0 ± 2.0	50.0 ± 3.0	60.0 ± 3.0	30.0 ± 3.0
Melting flow rate, g/10min, 200℃/5kgs	8.0 - 12.0	8.0 - 14.0	8.0 - 14.0	8.0 - 14.0	8.0 - 14.0	4.0 - 10.0	10.0 - 18.0
25% toluene solution viscosity, mPa·s	≤ 2500	≤ 1600	≤ 2000	≤ 1300	≤ 1000	≤ 1000	≤ 500
Tensile strength, MPa	≥ 12.0	≥ 20.0	≥ 10.0	≥ 8.0	≥ 4.0	≥ 3.0	≥ 6.0
Stress at 300%, MPa	≥ 0.5	≥ 0.7	≥ 0.5	≥ 0.5	≥ 0.3	≥ 0.2	≥ 0.5
Elongation at break, %	≥ 1050	≥ 900	≥ 1050	≥ 1000	≥ 1100	≥ 1000	≥ 900
Hardness, Shore A	40 ± 5	65 ± 5	40 ± 5	30 ± 5	30 ± 5	20 ± 5	45 ± 5
Volatiles content, %, by weight	≤ 0.70
Ash content, %, by weight	≤ 0.20
Yellow index	≤ 6.0