Comparison
Flexible Cast Polyurethane vs PEEK
A side-by-side comparison of Cast Polyurethane and Polyether Ether Ketone.
Physical
Density
1.10-1.25 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.5-1.5 %
0.15 %
Transparency
Opaque to Translucent
Opaque (amber)
Shrinkage
0.5-1.5 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.01-1.0 GPa (Shore A to D hardness)
3.6 GPa
Tensile Strength
20-60 MPa
100 MPa
Elongation at Break
300-800 %
50 %
Impact Strength (Izod)
30-100 J/m
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-50 to 100 °C
143 °C
Melting Point
N/A
343 °C
Continuous Service Temperature
70-120 °C
260 °C
Heat Deflection Temperature
20-80 °C
160 °C
Electrical
Dielectric Constant
3.5-5.0
3.2
Volume Resistivity
10^10-10^13 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
10-20 kV/mm
—
Chemical resistance
Acids
Good resistance
Excellent
Bases
Good resistance
Excellent
Solvents
Resistant to oils and greases, swells in polar solvents
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