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Certifications ISO 13485:2016 | AS9100D | ITAR | FDA Registered | CAGE Code 5TTR7 

PEEK

PEEK for CNC Machining

PEEK is a high-performance engineering plastic known for its exceptional resistance to harsh chemicals, as well as its excellent mechanical strength and dimensional stability.

Updated: 8/20/26

High-performing plastic known for its strength, stiffness, and chemical resistance

PEEK

PEEK (polyetheretherketone) is a high-performance engineering plastic known for its exceptional resistance to harsh chemicals, as well as its excellent mechanical strength and dimensional stability. It provides hydrolysis resistance against steam, water, and seawater.

PEEK can maintain its stiffness at elevated temperatures and is suitable for continuous use at temperatures up to 338ºF (170ºC). This engineering plastic has a well-established track record in demanding environments such as aerospace, oil and gas, and semiconductor industries.

Performance Characteristics

  • Chemical and hydrolysis resistance
  • Easy to fabricate and machine
  • Performs well mechanically at high temperatures
  • Strong and stiff

Common Brands

  • TECAPEEK
  • SustaPEEK
  • Ketron

PEEK Properties

  • Mechanical Properties
  • Thermal Properties
  • Electrical Properties
  • Optical Properties
  • Mechanical Properties

    Tensile Strength 14,000 psi
    Tensile Modulus of Elasticity 490,000 psi
    Tensile Elongation 60%
    Flexural Strength 24,600 psi
    Flexural Modulus of Elasticity 590,000 psi
    Compressive Strength -- psi
    Hardness R126
    Izod Impact 1.6 ft-lbs/in

  • Thermal Properties

    Coefficient of Linear Thermal Expansion 2.6 in/in/°F x 10-5
    Heat Deflection Temperature (66 psi/264 psi) -- / 306 °F
    Max Continuous Service Temperature in Air 480 °F

  • Electrical Properties

    Dielectric Strength 480 V/mil

  • Optical Properties

    Light Transmittance -- %
    Haze -- %