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PEEK is a high-performance plastic

PEEK (Polyetheretherketone)

  • Superior strength-to-weight ratio
  • Creep resistant
  • Long-wearing
  • Withstands very high temperatures
  • Radiation and chemical resistant
  • Low water absorption


PEEK is a high-performance thermoplastic that is an excellent choice for demanding applications. It withstands high temperatures and is resistant to chemicals and radiation. PEEK can be used continuously in operating temperatures up to 480° F and in hot water or steam with no compromise to its physical properties.

PEEK offers wear, moisture and chemical resistance along with exceptional strength, dimensional stability and stiffness. Because of its high-performance, PEEK is used in many challenging environments in the medical, nuclear, chemical processing and aerospace industries. PEEK is easily machined.


  • Semiconductor water handling components
  • Medical instruments
  • Aerospace components
  • Automotive engine parts
  • Compressor seals
  • Wear rings
  • Bearings


Our application engineers can help. With decades of experience in plastic material selection, we'll help you choose the optimal plastic for your application and budget.

To compare
the cost of this material to other thermoplastics, click here.

General Material Properties

Property   Metric units   English units
Density   1.23e3 - 1.32e3 kg/m^3   0.047 - 0.0477 lb/ft^3
Yield Strength   8.7e7 - 9.52e7 Pa   12.6 - 13.8 ksi
Tensile Strength   7.03e7 - 1.03e8 Pa   10.2 - 14.9 ksi
Elongation   0.3 - 1.5 % strain   30 - 150 % strain
Hardness (Vickers)   2.56e8 - 2.79e8 Pa   26.1 - 28.5 HV
Impact Strength (unnotched)   1.9e5 - 2e5 J/m^2   90.4 - 95.2 ft.lbf/in^2
Fracture Toughness   2.73e6 - 4.3e6 Pa/m^0.5   2.49 - 3.91 ksi/in^0.5
Young's Modulus   3.76e9 - 3.95e9 Pa   0.545 - 0.573 10^6 psi
Max Service Temperature   239 - 260 °C   462 - 500 °F
Melting Temperature   322 - 346 °C   612 - 655 °F
Insulator or Conductor   Insulator   Insulator
Specific Heat Capability   1.34E+03 J/kg °C   0.32 BTU/lb. °F
Thermal Expansion Coefficent   5e-5 - 6e-5 strain/°C   27.8 - 33.3 µstrain/°F
CO2 Footprint   12.3 - 13.6 kg/kg   12.3 - 13.6 lb/lb
Recycleable   Yes   Yes

The information on this page is intended as general guidance only and is only accurate at the time of posting (see date below). Specific material properties vary by manufacturer. Please contact a Dielectric application engineer for help in choosing the optimal material for your application and budget.

Posting Date: July 30, 2012