Comparison
PEI Standard vs PEEK
A side-by-side comparison of Polyetherimide Standard and Polyether Ether Ketone.
Physical
Density
1.27-1.29 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.2-0.4 %
0.15 %
Transparency
Amber (transparent)
Opaque (amber)
Shrinkage
0.5-0.7 %
1.1 – 1.4 %
Mechanical
Young's Modulus
3.0-3.5 GPa
3.6 GPa
Tensile Strength
70-90 MPa
100 MPa
Elongation at Break
30-60 %
50 %
Impact Strength (Izod)
10-15 kJ/m
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
210-217 °C
143 °C
Melting Point
N/A (amorphous)
343 °C
Continuous Service Temperature
160-170 °C
260 °C
Heat Deflection Temperature
190-205 °C (1.8 MPa)
160 °C
Electrical
Dielectric Constant
3.1-3.8
3.2
Volume Resistivity
10^14-10^16 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
15-20 kV/mm
—
Chemical resistance
Acids
Good
Excellent
Bases
Fair
Excellent
Solvents
Good (alcohols, oils, weak acids)
Excellent
UV Resistance
Good
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Recyclable (difficult)
Recyclable (specialty)
Recycling Code
7 (Other)
7
Carbon Footprint
High
~30 kg CO₂e / kg