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 Plastic Brief

 

Tech Brief  > PEEK

 
Polyetheretherketone ( PEEK ) ( Goodfellow )

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. 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.

 
Key Properties
Chemical Resistance Value

Acids - concentrated
Acids - dilute
Alcohols
Alkalis
Aromatic hydrocarbons
Greases and Oils
Halogens
Ketones

Fair
Good
Good
Good
Good
Good
Good
Good
Electrical Properties  
Dielectric constant @1MHz
Dielectric strength ( kv.mm-1)
Dissipation factor @ 1MHz
Volume resistivity ( ohmcm)
3.2-3.3 @ 50Hz-10Khz
19 @ 50µm
0.003
1015-1016
Mechanical Properties  
Coefficient of friction
Elongation at break ( % )
Hardness - Rockwell
Izod impact strength ( J.m-1 )
Poisson's ratio
Tensile modulus ( GPa )
Tensile strength ( MPa )
0.18
50
M99
85
0.4
3.7-4.0
70-100
Physical Properties  
Density ( g.cm-3 )
Flammability
Limiting oxygen index ( % )
Radiation resistance - Alpha
Resistance to Ultra-violet
Water absorption - equilibrium ( % )
Water absorption - over 24 hours ( % )
1.26 - 1.32
V-0 @ 1.5mm
35
Good
Fair
0.5
0.1-0.3
Thermal Properties  
Coefficient of thermal expansion ( x10-6 K-1 )
Heat-deflection temperature - 0.45MPa ( °C )
Heat-deflection temperature - 1.8MPa (°C )
Specific heat ( kJ.kg-1.K-1 )
Thermal conductivity @23°C ( W.m-1.K-1 )
Upper working temperature (°C )
47/108
>260
160
0.32
0.25
250
Property Value
Density
Dielectric Constant @1MHz
Dielectric Strength @25µm thick
Dissipation Factor @1MHz
Extension to break - Longitudinal
Extension to break - Transverse
Flammability
Resistencia Corona @ 20 kV mm-1
50 Hz
Permeability to Oxygen @25C
Permeability to Water @25C
Shrinkage
Specific Heat
Tensile modulus - Longitudinal
Tensile modulus - Transverse
Tensile strength - Longitudinal
Tensile strength - Transverse
g.cm-3

KV.mm-1

%
%

g.µm-1

x10-13.cm3.cm.cm-2.s-1.Pa-1
x10-13.cm3.cm.cm-2.s-1.Pa-1
%
kJ.kg-1.K-1
GPa
GPa
MPa
MPa
1.26 - amorphous
3.3
110-150
0.005
240
240
VTM-1 @ 0.1mm
35-50

0.06-0.1
160-300
0.5 @150C
1.45
2.6
2.6
120
120
Property Value
Specific Tenacity
Density
Extension to break
Knot Tenacity
Loop Tenacity
Modulus - 10 %
Modulus - 2 %
Modulus - 2 %
Modulus - 5 %
Shrinkage @180C
Tensile Strength
cN/tex
g.cm-3
%
cN/Tex
cN/Tex
GPa
cN/Tex
GPa
GPa
%
MPa
61
1.30
19
36
40
4.2
500
6.5
4.35
1.1
790
Property Value    
Material
Density
Extension to break
Knot Tenacity
Loop Tenacity
Modulus - 10 %
Modulus - 2 %
Modulus - 2 %
Modulus - 5 %
Shrinkage @180C
Tenacity
Tensile Strength

g.cm-3
%
cN/Tex
cN/Tex
GPa
cN/Tex
GPa
GPa
%
cN/Tex
GPa
Type A
1.30
38
28
25
1.85
382
5.0
2.7
1.8
34
0.44
Type B
1.30
35
23
19
2.8
438
5.7
3.7
8.4
30
0.39
Type C
1.30
20
34
17
3.4
474
6.2
3.9
3.0
60
0.78


 

 

 
 

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