Comparison
Extreme Chemical and Temperature Perfluoroelastomer (Kalrez) vs PEEK
A side-by-side comparison of Perfluoroelastomer (FFKM - Kalrez family) and Polyether Ether Ketone.
Physical
Density
1.9 - 2.15 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.05 %
0.15 %
Transparency
Opaque
Opaque (amber)
Shrinkage
1.0 - 2.0 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.03 - 0.07 GPa
3.6 GPa
Tensile Strength
10 - 20 MPa
100 MPa
Elongation at Break
100 - 250 %
50 %
Impact Strength (Izod)
N/A
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
0 to 15 °C
143 °C
Melting Point
N/A
343 °C
Continuous Service Temperature
-20 to 327 °C
260 °C
Heat Deflection Temperature
N/A
160 °C
Electrical
Dielectric Constant
2.1 - 2.2
3.2
Volume Resistivity
10^15 - 10^17 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
15 - 20 kV/mm
—
Chemical resistance
Acids
Outstanding
Excellent
Bases
Outstanding
Excellent
Solvents
Outstanding resistance to virtually all chemicals and solvents
Excellent
UV Resistance
Excellent
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Extremely Limited
Recyclable (specialty)
Recycling Code
N/A
7
Carbon Footprint
Very High (complex production)
~30 kg CO₂e / kg