TUFPRENE™ 125 SBS: Styrenic thermoplastic elastomer

styrene-butadiene block copolymer with enhanced styrenic resins compatibility for heightened impact strength. High flowability. It is supplied in pellet form.
Contact us for information on handling and use.

Styrenic resins modifier, imparting increased impact strength, mainly for food containers.
Food containers, Foamed nets, Frozen-food cups.


  • PS Modification

Physical Form

  • Pellet

Features and Benefits

  • High Hardness
  • High Flowability


Property Test Method Unit Value
Density ISO 1183 g/cm3 0.95
MFR 190°C, 2.16kg ISO 1133 g/10 min 4.5
MFR 200°C, 5kg ISO 1133 g/10 min 20
Hardness Type A ISO 7619 °Shore A 88
Tensile strength ISO 37 MPa 20
Elongation ISO37 % 800
300% Tensile Stress ISO 37 MPa 4.3
Viscosity as 25% solution in toluene Asahi Kasei Method mPa.s 570
styrene-butadiene Asahi Kasei Method wt% 40/60

<Test conditions>
Test piece:Compression-molded sheet, 2-mm thick, type1A dumbbell shape.
Roll kneading temp.: 120°C~130°C.
Compression molding: Preheating, 160°C 5 min; compression, 80 kg/cm2 160°C 5 min; cooling, 3 min.
Test measurements temp.: 23°C.

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We, Asahi Kasei Group, request that customers who are considering using our products in medical, pharmaceutical, cosmetic and other related applications (hereinafter collectively called “Medical Applications”) shall contact us and confirm our policy on Medical Applications in advance. Information herein regarding conformity to certain laws and regulations are as of January, 2015. Please consult with us for the latest status. We make no guarantees or warranties, express or implied, concerning the suitability of our products for use in Medical Applications. It is not our responsibility to determine if our products are safe, lawful, and technically suitable for intended applications.