Comparison
Silicone RTV Sealant vs PEEK
A side-by-side comparison of Room Temperature Vulcanizing Silicone Rubber and Polyether Ether Ketone.
Physical
Density
1.00-1.15 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.5-2.0 %
0.15 %
Transparency
Clear to Opaque
Opaque (amber)
Shrinkage
1-3 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.001-0.01 GPa
3.6 GPa
Tensile Strength
1-5 MPa
100 MPa
Elongation at Break
100-700 %
50 %
Impact Strength (Izod)
N/A
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-100 to -50 °C
143 °C
Melting Point
N/A
343 °C
Continuous Service Temperature
-60 to 200 °C
260 °C
Heat Deflection Temperature
N/A
160 °C
Electrical
Dielectric Constant
2.5-3.5
3.2
Volume Resistivity
10^13-10^15 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
15-25 kV/mm
—
Chemical resistance
Acids
Moderate resistance
Excellent
Bases
Moderate resistance
Excellent
Solvents
Resistant to water and many dilute chemicals
Excellent
UV Resistance
Excellent
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Difficult
Recyclable (specialty)
Recycling Code
N/A
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg