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 |
|
About Goodfellow
Goodfellow supplies metals, ceramics and other materials to meet the research, development and specialist production requirements of science and industry worldwide.
The Goodfellow group consists of four companies. The main administration, research laboratories and workshops are located at the Company's headquarters in Cambridge, England. The subsidiary offices in America, France and Germany provide an additional service.