Technical datasheet

SANTOPRENE™ 121-40B265

Supplied byCelanese- Last Updated on Jul 9, 2026

SANTOPRENE™ 121-40B265 by Celanese is a soft, black-colored polyolefin-based thermoplastic vulcanizate (TPV) grade. It combines a low coefficient of friction with good bonding to TPV and EPDM rubber.
  • It offers easy processability due to a high shear thinning behavior for excellent surface aesthetics, without surface bleeding after heat or UV aging.
  • It is a UV resistant, UV- and weather stabilized grade.
  • It is suitable for processing by high flow injection- and multi-injection molding.
  • Designed for shorter processing cycle time compared to thermoset EPDM rubber.
  • It is specially formulated to replace thermoset EPDM rubber in automotive weather seal and general molding applications.
  • It is designed for soft corner molding, sails, muckets and end caps of automotive dense and sponge weather seals.
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SANTOPRENE™ 121-40B265 properties

Mechanical properties

PropertiesValue & unitTest conditionTest method
100% Modulus, TD0.0 Visible After LoginVisible After LoginVisible After Login
Compression Set0.0 Visible After LoginVisible After LoginVisible After Login
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Other properties

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Elongation at Break, TD0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Strength at Break, TD0.0 Visible After LoginVisible After LoginVisible After Login

Physical properties

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Density0.0 Visible After LoginVisible After LoginVisible After Login

SANTOPRENE™ 121-40B265 Processing Guidelines

Injection Processing Guidelines

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Injection Molding Processing Guidelines

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