SIS Copolymer

The SIS copolymer is a styrene-isoprene-styrene (SIS) block copolymer that combines rigid polystyrene end blocks with a flexible polyisoprene mid-block. This SIS material delivers the elasticity of SIS rubber with the processability of a thermoplastic. As a versatile SIS polymer, it offers excellent tack, flexibility, and compatibility with adhesives, coatings, and sealants, making SIS block copolymer an ideal choice for high-performance applications.

Unique properties

Elasticity: They exhibit excellent elasticity and resilience, making them suitable for flexible and stretchable applications.
Adhesion: SIS copolymers have good adhesive properties, enabling them to bond well with various substrates.
Thermoplastic processing: They can be processed using thermoplastic processing methods such as extrusion, injection moulding and film blowing.

Flexibility: They are highly flexible, even at low temperatures, and are therefore suitable for applications that require flexibility.
Solvent compatibility: SIS copolymers are compatible with a wide range of solvents, enabling easy formulation of adhesives and coatings.

Applications SIS copolymer

Adhesives and Sealants

SIS copolymer is widely used in pressure-sensitive adhesives, hot-melt adhesives, and sealant formulations due to its excellent tack, elasticity, and low-temperature flexibility. The SIS block copolymer structure provides strong cohesive strength while maintaining softness and fast wet-out on a variety of substrates. SIS material is especially valued in applications requiring high initial adhesion, clarity, and compatibility with tackifiers and oils, such as labels, tapes, hygiene products, and construction sealants.

Applications SIS copolymer

Bitumen and Asphalt Applications

In bitumen and asphalt modification, SIS copolymer enhances elasticity, flexibility, and crack resistance, particularly at low temperatures. When blended with bitumen, SIS rubber improves stress absorption and reduces brittleness, contributing to longer service life and improved performance under thermal cycling. SIS polymer is commonly used in roofing membranes, waterproofing systems, and road construction where improved durability, adhesion, and deformation recovery are required.

Highlighted grades

Grade	Styrene content	Di-block content	Melt flow rate	Hardness Shore A	Tensile Strength	Elongation at break	Viscosity
Stypol 1500	15%	0%	11,0gr/10min	38,0	18MPa	1100%	1200mPa*s
Stypol 3000	30%	0%	11,0gr/10min	62	22MPa	950%	300mPa*s
Stypol 1650	16%	50%	13,0gr/10min	33,0	6MPa	1400%	900mPa*s

*The product types listed above are only a selection from our extensive range. For a complete overview or further information about our products, please contact us using the contact form at the bottom of this page.