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Elastomers

SEPTON™

Rubber elasticity, plastic moldability and damping performance
General Name
Thermoplastic elastomer
Sales Format
Pellet/powder

Overview

SEPTON™ is a styrenic thermoplastic elastomer developed by Kuraray. It is a block copolymer that consists of styrene-based hard-blocks and a diene soft block. SEPTON™ is used in a variety of TPE compounds. SEPTON™ can be processed in a wide variety of forms, including consumer goods, soft touch grips and automotive components.

For years, SEPTON™ has been setting benchmarks and transforming our perception of quality. SEPTON™ ignites innovation, consistently surpasses industry standards, and has become a staple in diverse domains.

Example

  • TPE compounds
  • Adhesives, coatings and sealants
  • Wires, cable skin material
  • Automotive parts
  • Fabrics, nonwoven materials
  • Plastics modifiers, compatibilizers
  • Medical parts
  • Toys, sporting goods
  • Elastic film
  • Electronic parts
  • Soft touch applications, grips
  • Orthopedic Gel
  • Packaging materials
  • Footwear Compound

  • High Elasticity: SEPTON™ is notably stretchy and can return to its original shape after being deformed, making it suitable for products that need to flex without breaking or warping.
  • High Strength: The material is robust, meaning it can withstand significant stress and pressure without deteriorating, ensuring durability in various applications.
  • Weather Resistance: SEPTON™ can endure various weather conditions, such as sun, rain, and wind, without losing its quality, making it ideal for outdoor and automotive applications.
  • Low Temperature Properties: It maintains its properties even in chilly conditions, ensuring functionality and reliability in cold environments without becoming brittle.
  • Chemical Resistance (acid, alkali, alcohol): The material resists damage from various chemicals like acids, alkalis, and alcohols, preserving its integrity in diverse environments.
  • Heat Aging Resistance: SEPTON™ can withstand prolonged exposure to heat without degrading, ensuring longevity and consistent performance in high-temperature applications.
  • Electrical Property (insulation): It acts as an insulator, preventing the flow of electrical current, which is crucial for ensuring safety in electrical applications.
  • Recyclable: SEPTON™ can be recycled, contributing to environmental sustainability by reducing waste and enabling the reuse of materials in new products.

SEPTON™ grades

GradeTypeStyrene contentMFRSolution viscosity
(Toluene Solution 30ºC)		Physical formHardness
(Type A)
230°C, 2.16 kg
(g/10 min)		200°C, 10 kg
(g/10 min)		5wt%
(mPa•s)		10wt%
(mPa•s)		15wt%
(mPa•s)
1020SEP36-1.8-42-Crumbs70
Figure1 Chemical structural formula

SEPTON™ 1000 series is a di-block type with excellent transparency and flow ability. Mainly used as an adhesive, sealing material, automotive part, wire cable filling agent and unsaturated polyester modifier.

GradeTypeStyrene contentMFRSolution viscosity
(Toluene Solution 30ºC)		Physical formHardness
(Type A)
230°C, 2.16 kg
(g/10 min)		200°C, 10 kg
(g/10 min)		5wt%
(mPa•s)		10wt%
(mPa•s)		15wt%
(mPa•s)
2002SEPS3070100--25Pellet80
2004FSEPS185---145Pellet67
2005SEPS20No flowNo flow401700-Crumbs-
2006SEPS35No flowNo flow271220-Crumbs-
2063SEPS13722-29140Pellet36
2104SEPS650.422--23Pellet98
Figure2 Chemical structural formula

The SEPS structure generally does not crystallize and exhibits excellent tensile elongation and low temperature properties. The SEPTON™ 2000 series features a variety of hard grades for use in many areas including personal care products, medical products, automotive parts, films and adhesives.

GradeTypeStyrene contentMFRSolution viscosity
(Toluene Solution 30ºC)		Physical formHardness
(Type A)
230°C, 2.16 kg
(g/10 min)		200°C, 10 kg
(g/10 min)		5wt%
(mPa•s)		10wt%
(mPa•s)		15wt%
(mPa•s)
4033SEEPS30<0.1<0.1-50390Crumbs76
4044SEEPS32No flowNo flow22460-Crumbs-
4055SEEPS30No flowNo flow905800-Crumbs-
4077SEEPS30No flowNo flow300--Crumbs-
4099SEEPS30No flowNo flow670--Crumbs-
Figure3 Chemical structural formula

The SEPTON™ 4000 series (SEEPS) series (SEEPS) offers better tensile strength, oil retention and PE compatibility than SEBS.

Additionally, the SEPTON™ 4000 series features a variety of molecular weight grades. The high molecular weight version provides robust tensile strength and compression set. Used in many applications including gels, films and automotive parts.

GradeTypeStyrene contentMFRSolution viscosity
(Toluene Solution 30ºC)		Physical formHardness
(Type A)
230°C, 2.16 kg
(g/10 min)		200°C, 10 kg
(g/10 min)		5wt%
(mPa•s)		10wt%
(mPa•s)		15wt%
(mPa•s)
8004SEBS31<0.1<0.1-40-Crumbs80
8006SEBS33No flowNo flow42--Crumbs-
Figure4 Chemical structural formula

The SEPTON™ 8000 series (hydrogenated SEBS type) possesses appropriate tensile strength and is used in adhesives, automotive parts, personal care products and more.

GradeTypeStyrene contentMFRSolution viscosity
(Toluene Solution 30ºC)		Physical formHardness
(Type A)
230°C, 2.16 kg
(g/10 min)		200°C, 10 kg
(g/10 min)		5wt%
(mPa•s)		10wt%
(mPa•s)		15wt%
(mPa•s)
HG-252SEEPS-
OH		2826---70Pellet80
Figure5 Chemical structural formula

SEPTON™ HG-252 features a hydroxyl group on one end and is used as a polar resin modifier and a polar/non-polar resin compatibilizer.

SEPTON™
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