SBC (SBS, SEBS, SIS, SEPS)

Styrene block copolymers (SBC) are a group of engineering polymers composed of repeating monomer units of styrene and DNA (DNAs include butadiene, isoprene, ethylene, and propylene). These polymers are widely used in various industries due to their unique properties, including a combination of rubber and plastic properties.

Types of Styrene Block Copolymers

SBS (Styrene-Butadiene-Styrene): The most common type of SBC and is composed of hard styrene blocks and soft butadiene blocks. SBS has good mechanical properties, high elasticity, and wear resistance.
SIS (Styrene-Isoprene-Styrene): Similar to SBS, but isoprene is used instead of butadiene. SIS is softer and more flexible than SBS.
SEBS (Styrene-Ethylene/Butylene-Styrene): The hydrogenated form of SBS. SEBS has better heat and chemical resistance than SBS and maintains its flexibility even at low temperatures.
SEPS (Styrene-Ethylene/Propylene-Styrene): It is the hydrogenated form of SIS. SEPS has similar properties to SEBS, but is slightly harder and more resistant to oils.

General properties of SBC

Combination of rubber and plastic properties: SBCs have both the elastic properties of rubber and the moldability of plastics.
Abrasion and tear resistance: SBS and SEBS in particular have good resistance to abrasion and tear.
High flexibility: SIS and SEBS in particular have high flexibility.
Thermal resistance: SEBS and SEPS have higher heat resistance than SBS and SIS.
Chemical resistance: SEBS and SEPS have better chemical resistance than SBS and SIS.
Moldability: SBCs can be easily molded into various shapes.

SBC Applications

Automotive industry: Production of automotive parts such as gaskets, seat covers, seals and sound insulation.
Shoe industry: Production of shoe soles, shoe uppers and other parts.
Construction industry: Production of thermal insulation, floor coverings and sealants.
Packaging industry: Production of packaging films, adhesives and protective coatings.
Sports industry: Production of balls, sports shoes and other sports equipment.