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.

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 Break1.4 to 45 %

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

Flexural Strength170 to 330 MPa (25 to 48 x 103 psi)

Glass Transition Temperature150 °C (300 °F)

Heat Deflection Temperature At 1.82 MPa (264 psi)160 to 320 °C (320 to 610 °F)

Limiting Oxygen Index (LOI)38 %

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

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

Specific Heat Capacity1390 to 1700 J/kg-K

Strength to Weight Ratio74 to 150 kN-m/kg

Tensile Strength: Ultimate (UTS)96 to 220 MPa (14 to 32 x 103 psi)

Thermal Conductivity0.25 to 0.93 W/m-K

Thermal Diffusivity0.12 to 0.14

Thermal Expansion15 to 48 µm/m-K

Water Absorption After 24 Hours0.060 to 0.3 %

Water Absorption At Saturation0.22 to 0.5 %

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

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