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Polyetheretherketone (PEEK)

A high performance thermoplastic with the characteristics common to this group – strong, stiff, hard, high temperature resistance, good chemical resistance and inherently low flammability and smoke emission. PEEK is pale amber in colour and usually semi-crystalline and opaque, except thin films are usually amorphous and transparent. It also has very good resistance to wear, dynamic fatigue and radiation, but it is difficult to process and very expensive. Filled grades, including ones designed for bearing-type applications, are also used.

Applications include flexible printed circuit boards (film), fibres and monofilaments, injection moulded engineering components and items used in aerospace and radiation environments.

General Properties:
ASTM or UL test Property PEEK
Physical Properties
D792 Density
0.048 1.32
D570 Water absorption, 24 hours -
Mechanical Properties
D638 Tensile Strength at Yield (psi) 16,000
D638 Tensile Modulus (psi) 570,000
D638 Tensile Elongation at Break (%) 20
D790 Flexural Strength (psi) -
D790 Flexural Strength (psi) 27,000
D790 Flexural Strength (psi) 27,000
D695 Compressive Strength (psi) 20,000
D695 Compressive Modulus (psi) -
D785 Compressive Modulus (psi) -
D256 IZOD Impact Notched (ft-lb/in) 2.9
Thermal Properties
D638 Coefficient of Linear Thermal Expansion (x 10-5 in./in./°F) 2.5
D648 Heat Deflection Temp (°F / °C) at 264 psi 329 / 165
D3418 Glass Transition Temp (°F / °C) 315 / 157
D3418 Melting Temp (°F / °C) 705 / 374
- Max Operating Temp (°F / °C) 500 / 260
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)
UL94 Flammability Rating V-0
Electrical Properties
D149 Dielectric Strength (V/mil) short time, 1/8″ thick 430
D150 Dielectric Constant at 1 MHz -
D150 Dissipation Factor at 1 MHz -
D257 Surface Resistivity (ohms per square) at 50% RH 5 x 10 16
D257 Volume Resistivity (ohm-cm) at 50% RH 5 x 10 16

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