Elastomers, clear resins, and synthetic rubbers from Asahi Kasei

Elastomers, Clear Resins, and Synthetic Rubbers

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Asadene&Tufdene&AsapreneTM S.O.E. : Flexible resin Tufprene&AsapreneT : Styrenic thermoplastic elastomers Asaflex : High-performance clear styrenic copolymers Tuftec : Hydogenated styrenic termoplastic resin Applications What's new Tech guide Brochures Home Products
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Product Information Asaflex  

High-performance Clear Styrenic Block Copolymers (SBC) Asaflex™

Asaflex™ is a styrene-butadiene block copolymer (SBC) characterized by both superior transparency and high impact resistance. As the polybutadiene-phase (i.e., the rubber-phase) dispersion in Asaflex™ is on a finer scale than the wavelength of visible light, Asaflex™ has flexibility and hinge characteristics while maintaining high transparency.

Due to good compatibility with styrenic resins such as GPPS, Asaflex™ can be blended at arbitrary ratio.


Grade MFR*1



Softening Point*2

Haze*3 Applications
800S 6


96 3.0 Food PackagingMedicalMedical
805 10 1550 91 0.5 Food PackagingMedicalMedical
810 5 1400 83 1.2 Polymer ModificationAdhesives, Sealants and PaintFootwear Medical
815 6 1200 82 0.5 Food PackagingPolymer Modification
825 6 1200 82 0.5 Polymer ModificationFootwear Medical
830 6 1100 72 2.0 Polymer ModificationMedical
835 6 1100 72 2.0 Food PackagingPolymer Modification
840 7 1500 81 1.2 Polymer ModificationMedical
845 7 1500 81


Food PackagingPolymer Modification
*1200°C, 5kgf

*210 N Load, 50 K/h

*32mm Thick Plate


  • High transparency and gloss
  • Superior impact strength
  • Superior compatibility with styrenic resins
  • Excellent flexibility yielded to GPPS
  • High hinge characteristics
  • Broad range of processing methods and conditions (i.e., inflation molding)
  • Stable to gamma-radiation sterilization
  • Low double refraction like acrylate resin
  • Coloring and printing capability

Applications and Usage

Asaflex™ can be used in various molding methods such as injection, extrusion, inflation molding and etc. just same as styrenic resins. It can also be used for shrink film applications with high elongation.

Asaflex™ Blend Simulator

Enter the Asaflex™ content below, to obtain an estimate of the transparency and impact resistance of sheets made with blends of the indicated Asaflex™ grade with GPPS and with SC.

Asaflex™ content*: wt%
*Enter wt% between 30 and 70.

Property Units Asaflex™ 835 Asaflex™ 845
Haze %
Dart impact strength kg·cm

Test conditions:
Sheet thickness: 0.6 mm
Haze: With fluid paraffin coating
Dart: Tip radius, 1/2 inch
Temperature: 23°C

SC: Styrenic copolymer from PS Japan Corp. similar to Asaflex™ in refraction index; sheets produced from SC-Asaflex™ blends show transparency and impact resistance levels unattainable with GPPS.


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