Comparison
Rigid Unsaturated Polyester vs PEEK
A side-by-side comparison of Unsaturated Polyester Resin and Polyether Ether Ketone.
Physical
Density
1.10-1.30 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.2-0.8 %
0.15 %
Transparency
Clear to Opaque
Opaque (amber)
Shrinkage
4-8 %
1.1 – 1.4 %
Mechanical
Young's Modulus
2.0-3.5 GPa
3.6 GPa
Tensile Strength
40-70 MPa
100 MPa
Elongation at Break
1-3 %
50 %
Impact Strength (Izod)
8-20 J/m
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
50-100 °C
143 °C
Melting Point
N/A
343 °C
Continuous Service Temperature
60-120 °C
260 °C
Heat Deflection Temperature
50-90 °C
160 °C
Electrical
Dielectric Constant
4.0-5.5
3.2
Volume Resistivity
10^12-10^14 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Moderate resistance
Excellent
Bases
Poor resistance
Excellent
Solvents
Resistant to hydrocarbons and esters
Excellent
UV Resistance
Poor without additives
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Difficult
Recyclable (specialty)
Recycling Code
N/A
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg