PEKEKK - polyetherketonetherketoneketone

TECAPEEK ST black is a high temperature semi crystalline thermoplastic based on polyetherketonetherketoneketone (PEKEKK). TECAPEEK ST black is manufactured by Ensinger using VICTREX ST™ polymer. Due to its high glass transition temperature, excellent mechanical properties can be observed, even when the part is subjected to thermal loads. Furthermore, the material PEKEKK also satisfies requirements with regard to processability, purity and chemical resistance. Compared to TECAPEEK (PEEK) and TECAPEEK HT (PEK), the melt, glass transition temperature, and overall strength levels of TECAPEEK ST (PEKEKK) are noticeably higher, as is the mechanical loading capacity. Machined components made of PEKEKK often combine better strength and stiffness, as well as higher flexural strength, and also benefit from a higher heat deflection temperature.


Chemical designation
PEKEKK (Polyetherketoneetherketoneketone)
1,32 g/cm3

Main Features

  • high thermal and mechanical capacity
  • very good chemical resistance
  • good machinability
  • good heat deflection temperature
  • low moisture absorption
  • high dimensional stability

Target industries

Technical details

  • Mechanical properties
    Mechanical propertiesValueUnitParameterNorm
    Tensile strength134MPa50mm/minDIN EN ISO 527-2
    Tensile strength at yield134MPa50mm/minDIN EN ISO 527-2
    Elongation at yield5%50mm/minDIN EN ISO 527-2
    Elongation at break (tensile test)13%50mm/minDIN EN ISO 527-2
    Flexural strength193MPa2mm/min, 10 NDIN EN ISO 178
    Modulus of elasticity
    (flexural test)
    4600MPa2mm/min, 10 NDIN EN ISO 178
    Compression strength24/42/98MPa1% / 2% / 5%EN ISO 604
    Compression modulus3500MPa5mm/min, 10 NEN ISO 604
    Impact strength (Charpy)n.b.kJ/m2max. 7,5JDIN EN ISO 179-1eU
    Notched impact strength (Charpy)4kJ/m2max. 7,5JDIN EN ISO 179-1eA
    Ball indentation hardness275MPaISO 2039-1
    Modulus of elasticity
    (tensile test)
    4600MPa1mm/minDIN EN ISO 527-2
  • Thermal properties
    Thermal propertiesValueUnitParameterNorm
    Melting temperature384CDIN EN ISO 11357
    Service temperature300Cshort termNN
    Service temperature260Clong termNN
    Thermal expansion (CLTE)510-5*1/K23-60°C, long.DIN EN ISO 11359-1;2
    Thermal expansion (CLTE)510-5*1/K23-100°C, long.DIN EN ISO 11359-1;2
    Glass transition temperature165CDIN EN ISO 11357
    Thermal expansion (CLTE)610-5*1/K100-150°C, long.DIN EN ISO 11359-1;2
  • Electrical properties
    Electrical propertiesValueUnitParameterNorm
    surface resistivity1014ODIN IEC 60093
  • Other properties
    Other propertiesValueUnitParameterNorm
    Resistance to hot water/ bases+--
    Resistance to weathering(+)--
    Water absorption0.03%24h / 96h (23°C)DIN EN ISO 62
    Flammability (UL94)V0-corresponding toDIN IEC 60695-11-10;

Stock program