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