Comparison
Extreme Chemical and Temperature Perfluoroelastomer (Kalrez) vs PETG
A side-by-side comparison of Perfluoroelastomer (FFKM - Kalrez family) and Polyethylene Terephthalate Glycol.
Physical
Density
1.9 - 2.15 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.05 %
0.13 %
Transparency
Opaque
Transparent
Shrinkage
1.0 - 2.0 %
0.2 – 0.5 %
Mechanical
Young's Modulus
0.03 - 0.07 GPa
2.1 GPa
Tensile Strength
10 - 20 MPa
50 MPa
Elongation at Break
100 - 250 %
120 %
Impact Strength (Izod)
N/A
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
0 to 15 °C
80 °C
Melting Point
N/A
—
Continuous Service Temperature
-20 to 327 °C
65 °C
Heat Deflection Temperature
N/A
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.1 - 2.2
3.3
Volume Resistivity
10^15 - 10^17 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
15 - 20 kV/mm
—
Chemical resistance
Acids
Outstanding
Good
Bases
Outstanding
Fair
Solvents
Outstanding resistance to virtually all chemicals and solvents
—
UV Resistance
Excellent
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Extremely Limited
Recyclable
Recycling Code
N/A
1
Carbon Footprint
Very High (complex production)
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %