Comparison
High-Temperature Sealant Silicone Rubber vs PETG
A side-by-side comparison of High-Temperature Sealant Grade Vinyl Methyl Silicone Rubber (VMQ) and Polyethylene Terephthalate Glycol.
Physical
Density
1.14 - 1.20 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.2 - 0.4 %
0.13 %
Transparency
Opaque
Transparent
Shrinkage
1.5 - 2.5 %
0.2 – 0.5 %
Mechanical
Young's Modulus
0.001 - 0.008 GPa
2.1 GPa
Tensile Strength
4 - 8 MPa
50 MPa
Elongation at Break
300 - 600 %
120 %
Impact Strength (Izod)
N/A
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
-70 to -50 °C
80 °C
Melting Point
N/A
—
Continuous Service Temperature
-50 to 250 °C
65 °C
Heat Deflection Temperature
N/A
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.9 - 3.1
3.3
Volume Resistivity
10^13 - 10^15 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
18 - 28 kV/mm
—
Chemical resistance
Acids
Poor
Good
Bases
Poor
Fair
Solvents
Poor resistance to hydrocarbon solvents
—
UV Resistance
Excellent
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Very Limited
Recyclable
Recycling Code
N/A
1
Carbon Footprint
High
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %