Comparison
Durable Tough Cast Polyurethane vs PEEK
A side-by-side comparison of Cast Polyurethane (PU) elastomer and Polyether Ether Ketone.
Physical
Density
1.15 - 1.25 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.5 - 1.5 %
0.15 %
Transparency
Opaque to Translucent
Opaque (amber)
Shrinkage
0.5 - 1.0 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.01 - 0.2 GPa
3.6 GPa
Tensile Strength
30 - 80 MPa
100 MPa
Elongation at Break
300 - 700 %
50 %
Impact Strength (Izod)
Very High
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-10 to 10 °C
143 °C
Melting Point
N/A
343 °C
Continuous Service Temperature
-30 to 80 °C
260 °C
Heat Deflection Temperature
60 - 100 °C
160 °C
Electrical
Dielectric Constant
5.0 - 7.0
3.2
Volume Resistivity
10^10 - 10^12 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
10 - 20 kV/mm
—
Chemical resistance
Acids
Good
Excellent
Bases
Good
Excellent
Solvents
Good resistance to oils, greases, aliphatic hydrocarbons; swells in strong polar solvents, ketones, and aromatic hydrocarbons
Excellent
UV Resistance
Fair (can yellow)
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Difficult (thermoset-like behavior)
Recyclable (specialty)
Recycling Code
N/A
7
Carbon Footprint
Moderate to High
~30 kg CO₂e / kg