Mar 5 2003
Background
Polyethetetherketone ( PEEK ) is 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.
Polyethetetherketone ( PEEK ) is pale amber in colour and usually semi-crystalline and opaque, except thin films are usually amorphous and transparent. Polyethetetherketone ( PEEK ) 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 of Polyethetetherketone ( PEEK ) include flexible printed circuit boards (film), fibres and monofilaments, injection moulded engineering components and items used in aerospace and radiation environments.
Key Properties
| The key properties of Polyetheretherketone ( PEEK ) are tabulated below.
Table 1. Key properties
| Chemical Resistance |
| Acids - concentrated |
Fair |
| Acids - dilute |
Good |
| Alcohols |
Good |
| Alkalis |
Good |
| Aromatic hydrocarbons |
Good |
| Greases and Oils |
Good |
| Halogens |
Good |
| Ketones |
Good |
| Electrical Properties |
| Dielectric constant @ 1 MHz |
3.2-3.3 @ 50 Hz - 10 Khz |
| Dielectric strength ( kv.mm-1 ) |
19 @ 50 µm |
| Dissipation factor @ 1 MHz |
0.003 |
| Volume resistivity ( ohmcm ) |
1015 - 1016 |
| Mechanical Properties |
| Coefficient of friction |
0.18 |
| Elongation at break ( % ) |
50 |
| Hardness - Rockwell |
M99 |
| Izod impact strength ( J.m-1 ) |
85 |
| Poisson’s ratio |
0.4 |
| Tensile modulus ( GPa ) |
3.7 - 4.0 |
| Tensile strength ( MPa ) |
70-100 |
| Physical Properties |
| Density ( g.cm-3 ) |
1.26 - 1.32 |
| Flammability |
V-0 @ 1.5 mm |
| Limiting oxygen index ( % ) |
35 |
| Radiation resistance - Alpha |
Good |
| Resistance to Ultra-violet |
Fair |
| Water absorption - equilibrium ( % ) |
0.5 |
| Water absorption - over 24 hours ( % ) |
0.1-0.3 |
| Thermal Properties |
| Coefficient of thermal expansion ( x10-6 K-1 ) |
47/108 |
| Heat-deflection temperature - 0.45 MPa ( °C ) |
>260 |
| Heat-deflection temperature - 1.8 MPa (°C ) |
160 |
| Specific heat ( kJ.kg-1.K-1 ) |
0.32 |
| Thermal conductivity @ 23 °C ( W.m-1.K-1 ) |
0.25 |
| Upper working temperature (°C ) |
250 |
| Properties Polyetheretherketone Film |
| Property |
|
Value |
| Density |
g.cm-3 |
1.26 - amorphous |
| Dielectric Constant @ 1 MHz |
|
3.3 |
| Dielectric Strength @ 25 µm thick |
KV.mm-1 |
110-150 |
| Dissipation Factor @ 1 MHz |
|
0.005 |
| Extension to break - Longitudinal |
% |
240 |
| Extension to break - Transverse |
% |
240 |
| Flammability |
VTM-1 @ 0.1 mm |
| Resistencia Corona @ 20 kV mm-1 50 Hz |
g.µm-1 |
35-50 |
| Permeability to Oxygen @ 25 C |
x10-13.cm3.cm.cm-2.s-1.Pa-1 |
0.06-0.1 |
| Permeability to Water @ 25 C |
x10-13.cm3.cm.cm-2.s-1.Pa-1 |
160-300 |
| Shrinkage |
% |
0.5 @ 150 C |
| Specific Heat |
kJ.kg-1.K-1 |
1.45 |
| Tensile modulus - Longitudinal |
GPa |
2.6 |
| Tensile modulus - Transverse |
GPa |
2.6 |
| Tensile strength - Longitudinal |
MPa |
120 |
| Tensile strength - Transverse |
MPa |
120 |
| Properties Polyetheretherketone Fibre |
| Property |
|
Value |
| Specific Tenacity |
cN/tex |
61 |
| Density |
g.cm-3 |
1.30 |
| Extension to break |
% |
19 |
| Knot Tenacity |
cN/Tex |
36 |
| Loop Tenacity |
cN/Tex |
40 |
| Modulus - 10% |
GPa |
4.2 |
| Modulus - 2% |
cN/Tex |
500 |
| Modulus - 2% |
GPa |
6.5 |
| Modulus - 5% |
GPa |
4.35 |
| Shrinkage @ 180 C |
% |
1.1 |
| Tensile Strength |
MPa |
790 |
| Properties Polyetheretherketone Monofilament |
| Property |
|
Value |
| Material |
|
Type A |
Type B |
Type C |
| Density |
g.cm-3 |
1.30 |
1.30 |
1.30 |
| Extension to break |
% |
38 |
35 |
20 |
| Knot Tenacity |
cN/Tex |
28 |
23 |
34 |
| Loop Tenacity |
cN/Tex |
25 |
19 |
17 |
| Modulus - 10% |
GPa |
1.85 |
2.8 |
3.4 |
| Modulus - 2% |
cN/Tex |
382 |
438 |
474 |
| Modulus - 2% |
GPa |
5.0 |
5.7 |
6.2 |
| Modulus - 5% |
GPa |
2.7 |
3.7 |
3.9 |
| Shrinkage @ 180 C |
% |
1.8 |
8.4 |
3.0 |
| Tenacity |
cN/Tex |
34 |
30 |
60 |
| Tensile Strength |
GPa |
0.44 |
0.39 |
0.78 |
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