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 process ability, 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

  • made exclusively from Victrex® resin
  • high heat deflection temperature
  • excellent mechanical properties
  • excellent chemical resistance
  • easy to machine
  • good dimensional stability
  • electrically insulating
  • high purity

Target industries

Technical details

  • Mechanical properties
    Mechanical propertiesValueUnitConditionTest Method
    Tensile strength at yield19,400psi0.2 in/minASTM D 638
    Modulus of elasticity
    (tensile test)
    760,000psi(0.2 in/min)ASTM D 638
    Impact strength (Izod)0.8ftlbsin@ 73 °FASTM D 256
    Compression strength24,400psi10% StrainASTM D 695
    Compression strength2,860psi1% StrainASTM D 695
    Compression modulus445,000psiASTM D 695
    Elongation at break (tensile test)15%0.2 in/minASTM D 638
    Modulus of elasticity
    (flexural test)
    740,000psi@ 73 °FASTM D 790
    Flexural strength31,000psi@ 73 °FASTM D 790
    Rockwell hardness112-R ScaleASTM D 785
  • Thermal properties
    Thermal propertiesValueUnitConditionTest Method
    Melting temperature729FDIN EN ISO 11357
    Glass transition temperature324FDIN EN ISO 11357
    Deflection temperature342F@264 psiISO-R 75 Method A
    Service temperature500FLong Term-
    Thermal expansion (CLTE)2.72*10^-5 in/in / degreASTM E 831
    Service temperature572Fshort term-
  • Electrical properties
    Electrical propertiesValueUnitConditionTest Method
    Volume resistivity>1015O*cmDIN IEC 60093
    surface resistivity1.0*1014Ohm/square-
  • Other properties
    Other propertiesValueUnitConditionTest Method
    Moisture absorption0.05%@ saturation, 50% R.H.ASTM D 570
    Moisture absorption0.02%@ 24 hrs., 73°FASTM D 570
    Flammability (UL94)V0--

Stock program