Comparison
Chemical-Resistant Fluoroelastomer (Viton) vs PEEK
A side-by-side comparison of Fluoroelastomer (FKM - Viton family) and Polyether Ether Ketone.
Physical
Density
1.7 - 1.9 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.1 - 0.3 %
0.15 %
Transparency
Opaque
Opaque (amber)
Shrinkage
1.0 - 2.0 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.02 - 0.06 GPa
3.6 GPa
Tensile Strength
10 - 25 MPa
100 MPa
Elongation at Break
100 - 300 %
50 %
Impact Strength (Izod)
N/A
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-10 to 0 °C
143 °C
Melting Point
N/A
343 °C
Continuous Service Temperature
-20 to 250 °C
260 °C
Heat Deflection Temperature
N/A
160 °C
Electrical
Dielectric Constant
4.0 - 5.0
3.2
Volume Resistivity
10^11 - 10^13 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
10 - 20 kV/mm
—
Chemical resistance
Acids
Excellent
Excellent
Bases
Excellent
Excellent
Solvents
Excellent resistance to fuels, oils, many solvents, and chemicals
Excellent
UV Resistance
Excellent
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Very Limited
Recyclable (specialty)
Recycling Code
N/A
7
Carbon Footprint
High
~30 kg CO₂e / kg