MakeItFrom.com
Menu (ESC)

Polyetheretherketone (PEEK)

PEEK is an otherwise-unclassified thermoplastic material. It can have a moderately high tensile strength relative to other thermoplastics in the database. It has four common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare PEEK to other materials. From top to bottom: otherwise unclassified thermoplastic, thermoplastics, and the entire database.

Compressive (Crushing) Strength

120 to 300 MPa 17 to 44 x 103 psi

Elastic (Young's, Tensile) Modulus

4.0 to 24 GPa 0.58 to 3.5 x 106 psi

Elongation at Break

1.6 to 43 %

Flexural Modulus

3.8 to 19 GPa 0.55 to 2.7 x 106 psi

Flexural Strength

150 to 330 MPa 21 to 47 x 103 psi

Impact Strength: Notched Izod

78 to 120 J/m 1.5 to 2.2 ft-lb/in

Rockwell R Hardness

120

Shear Strength

50 to 100 MPa 7.3 to 15 x 103 psi

Strength to Weight Ratio

74 to 150 kN-m/kg

Tensile Strength: Ultimate (UTS)

97 to 200 MPa 14 to 30 x 103 psi

Thermal Properties

Glass Transition Temperature

240 °C 460 °F

Heat Deflection Temperature At 1.82 MPa (264 psi)

160 to 300 °C 320 to 580 °F

Melting Onset (Solidus)

340 °C 640 °F

Specific Heat Capacity

1390 to 1700 J/kg-K 0.33 to 0.41 BTU/lb-°F

Thermal Conductivity

0.25 to 0.93 W/m-K 0.14 to 0.54 BTU/h-ft-°F

Thermal Diffusivity

0.11 to 0.44 m2/s

Thermal Expansion

15 to 52 µm/m-K

Other Material Properties

Density

1.3 to 1.5 g/cm3 82 to 93 lb/ft3

Electrical Resistivity Order of Magnitude

3.0 to 14 10x Ω-m

Limiting Oxygen Index (LOI)

38 %

Water Absorption After 24 Hours

0.060 to 0.3 %

Water Absorption At Saturation

0.22 to 0.5 %

Followup Questions

Variant Materials

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