Description

Polystyrene-Block-Poly(Ethylene-Ran-Butylene)-Block-Polystyrene is a high-performance thermoplastic elastomer (TPE) known for its unique combination of rubber-like flexibility and thermoplastic processability. This triblock copolymer is critical for applications requiring excellent impact resistance, weatherability, and the ability to be repeatedly melted and reshaped. It is an essential material for formulators and manufacturers in the automotive, construction, and consumer goods industries seeking durable, versatile polymer solutions.

Application

• Polymer Modification & Impact Enhancement: Widely used as an impact modifier and compatibilizer for engineering plastics like polypropylene (PP) and polystyrene (PS) to improve toughness and stress-crack resistance.
• Adhesives, Sealants, and Coatings: Serves as a key polymer base for high-performance hot-melt adhesives (HMAs), pressure-sensitive adhesives (PSAs), and sealants, providing excellent tack, cohesion, and flexibility.
• Automotive Components: Utilized in the production of flexible interior and exterior parts, including bumper fascias, trim, gaskets, and soft-touch overmolding due to its durability and processing ease.
• Footwear & Consumer Products: Employed in shoe soles, grips, handles, and toys where a balance of softness, resilience, and colorability is required.
• Bitumen Modification: Acts as a polymer modifier for asphalt and roofing membranes, enhancing elasticity, temperature resistance, and fatigue life.
• Medical Device Components: Used in select non-implantable medical device applications where its clarity, flexibility, and biocompatibility (in specific grades) are advantageous.

Basic Information

Product Name	Polystyrene-Block-Poly(Ethylene-Ran-Butylene)-Block-Polystyrene
CAS No.	66070-58-4
Molecular Formula	(C8H8)x-(C4H8)y-(C8H8)z
Molecular Weight	Variable (Typically 50,000 - 200,000 g/mol)
Synonyms	SEBS; Polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene; Styrene-Ethylene/Butylene-Styrene Block Copolymer; SEBS Thermoplastic Elastomer; TPE-S; Kraton G Series (Trade Name); Tuftec (Trade Name); Septon (Trade Name)
EINECS	266-121-1

Quality Control

Our SEBS products are manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance reliability. Key parameters such as styrene/rubber ratio, molecular weight, and melt flow index are rigorously controlled. A comprehensive Certificate of Analysis (COA) detailing physical, mechanical, and purity specifications is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from heat sources and open flames. Under these conditions, the product remains stable for extended periods.

Specification

Item	Specification
Appearance	White to off-white pellets or powder
Styrene Content	20% - 40% (Grade Dependent)
Melt Flow Rate (MFR)	1 - 30 g/10min (230°C/5kg)
Specific Gravity	0.90 - 0.95
Tensile Strength	10 - 30 MPa
Elongation at Break	> 500%
Shore A Hardness	30 - 90
Volatile Content	< 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.