Comparison
Flexible Durable Copolyester Ether (Hytrel) vs PEEK
A side-by-side comparison of Copolyester Ether (COPE - Hytrel family) and Polyether Ether Ketone.
Physical
Density
1.11 - 1.25 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.1 - 0.5 %
0.15 %
Transparency
Opaque to Translucent
Opaque (amber)
Shrinkage
0.8 - 1.8 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.01 - 0.1 GPa
3.6 GPa
Tensile Strength
20 - 60 MPa
100 MPa
Elongation at Break
400 - 800 %
50 %
Impact Strength (Izod)
Good (especially notched)
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-50 to -30 °C
143 °C
Melting Point
140 - 170 °C
343 °C
Continuous Service Temperature
-40 to 100 °C
260 °C
Heat Deflection Temperature
40 - 70 °C
160 °C
Electrical
Dielectric Constant
4.0 - 5.0
3.2
Volume Resistivity
10^11 - 10^13 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
15 - 25 kV/mm
—
Chemical resistance
Acids
Good
Excellent
Bases
Good
Excellent
Solvents
Good resistance to oils, fuels, hydraulic fluids, and many chemicals; swells in strong solvents
Excellent
UV Resistance
Good (with additives)
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Recyclable (thermoplastic)
Recyclable (specialty)
Recycling Code
7 (Other)
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg