Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Kuraray SEPTON™ 4033 Impact Modifier

SEPTON™ 4033 is a SEEPS styrenic thermoplastic elastomer of Kuraray’s 4000 series with 30% styrene content. It features higher tensile strength, excellent oil retention and good PE compatibility, low melt flow, superior heat/weather resistance and electrical insulation, ideal for high-performance gel, film and automotive component formulation.

Features Of Kuraray SEPTON™ 4033 Impact Modifier

  1. 30% styrene content with SEEPS structure, delivering higher tensile strength and superior compression set performance vs traditional SEBS.

  2. Excellent oil retention capacity, maintaining stable performance in oil-filled formulations for long service life.

  3. Good compatibility with polyethylene (PE), realizing efficient blending and performance enhancement of polyolefin systems.

  4. Low melt flow under standard conditions, high molecular weight with stable physical and chemical properties in harsh environments.

  5. No plasticizer added, environmentally friendly, with good compatibility with tackifying resins, process oil for adhesive and sealant formulation.

Typical Applications Of Kuraray SEPTON™ 4033 Impact Modifier

  1. High-performance gel products: Used in oil-filled gel for electronic potting, automotive cushioning and medical gel pads with oil retention.

  2. Flexible films and sheets: Processed into high-toughness films for food packaging, automotive interior films with heat/weather resistance.

  3. Automotive components: Applied in oil seals, vibration dampers and wire cable fillers for oil resistance and mechanical strength.

  4. Adhesives and sealants: Formulated into high-performance structural adhesives for PE material bonding with good compatibility.

  5. Polymer modification: Serves as a toughening modifier for PE/PP blends, improving tensile strength and low-temperature performance.

Specifications Of Kuraray SEPTON™ 4033 Impact Modifier

Physical Properties
Styrene Content30 wt%
Hardness76 (Type A)
Melt Flow Properties
Melt Flow Rate (230°C, 2.16 kg)<0.1 g/10min
Melt Flow Rate (200°C, 10.0 kg)<0.1 g/10min
Solution Viscosity (Toluene, 30°C)
Solution Viscosity (5 wt%)- mPa·s
Solution Viscosity (10 wt%)50 mPa·s
Solution Viscosity (15 wt%)390 mPa·s
Physical Form
Physical FormBlock/Pellet block
















































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