Polyetheretherketone (PEEK)

PEEK is a thermoplastic material, further classified as an otherwise unclassified thermoplastic.

It has four common variants, each represented as a separate material. The Material Properties section below shows ranges encompassing all variants. For more specific values, follow the links in the Variant Materials section.

Material Properties

Compressive (Crushing) Strength120 to 300 MPa (17 to 44 x 103 psi)

Density1.3 to 1.5 g/cm3 (81 to 94 lb/ft3)

Elastic (Young's, Tensile) Modulus4.0 to 24 GPa (0.58 to 3.5 x 106 psi)

Electrical Resistivity Order of Magnitude3 to 14 10x Ω-m

Elongation at Break1.6 to 43 %

Flexural Modulus3.8 to 19 GPa (0.55 to 2.8 x 106 psi)

Flexural Strength150 to 330 MPa (22 to 48 x 103 psi)

Glass Transition Temperature240 °C (460 °F)

Heat Deflection Temperature At 1.82 MPa (264 psi)160 to 300 °C (320 to 570 °F)

Impact Strength: Notched Izod78 to 120 J/m (1.5 to 2.2 ft-lb/in)

Limiting Oxygen Index (LOI)38 %

Melting Onset (Solidus)340 °C (640 °F)

Rockwell R Hardness120

Shear Strength50 to 100 MPa (7.3 to 15 x 103 psi)

Specific Heat Capacity1390 to 1700 J/kg-K

Strength to Weight Ratio75 to 130 kN-m/kg

Tensile Strength: Ultimate (UTS)97 to 200 MPa (14 to 29 x 103 psi)

Thermal Conductivity0.25 to 0.93 W/m-K

Thermal Diffusivity0.12 to 0.14 m2/s

Thermal Expansion15 to 52 µm/m-K

Water Absorption After 24 Hours0.060 to 0.3 %

Water Absorption At Saturation0.22 to 0.5 %

The length of each bar compares the given value to the highest value in the database.

Further Reading

ASTM F2026: Standard Specification for Polyetheretherketone (PEEK) Polymers for Surgical Implant Applications

Modern Plastics Handbook, Charles A. Harper (editor), 1999

Plastics Materials, 7th ed., J. A. Brydson, 1999

SPI Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 5th ed., Michael L. Berins (editor), 2000