ASAPRENE™ T-438 SBS: Styrenic thermoplastic elastomer

Specifically developed for superior characteristics and performance in pressure-sensitive and other adhesives, marked by good processability through low viscosity and a high level of balanced characteristics. It is supplied in pellet form.
Technical data (Adhesive properties compared to our other grades)
Contact us for information on handling and use.

Adhesives and sealants modifier, meeting requirements for low temperature coating. Hot-melt pressure-sensitive adhesives modifier, with superior flexibility and tack characteristics, for sanitary products.


  • Adhesives

Physical Form

  • Pellet

Features and Benefits

  • High Flowability


Property Test Method Unit Value
Density ISO 1183 g/cm3 0.94
MFR 190°C, 2.16kg ISO 1133 g/10 min
MFR 200°C, 5kg ISO 1133 g/10 min 25
Hardness Type A ISO 7619 °Shore A 80
Tensile Strength ISO 37 MPa 5
Elongation ISO 37 % 1150
300% Tensile Stress ISO 37 MPa 3.0
Viscosity as 25% solution in toluene Asahi Kasei Method mPa.s 470
styrene/butadiene Asahi Kasei Method wt% 35/65

<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.