Comparison
High-Temperature Flexible Vinyl Methyl Silicone vs PETG
A side-by-side comparison of Vinyl Methyl Silicone Rubber (VMQ) and Polyethylene Terephthalate Glycol.
Physical
Density
1.12 - 1.52 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.1 - 0.5 %
0.13 %
Transparency
Opaque to Translucent
Transparent
Shrinkage
1.0 - 3.0 %
0.2 – 0.5 %
Mechanical
Young's Modulus
0.001 - 0.01 GPa
2.1 GPa
Tensile Strength
3 - 10 MPa
50 MPa
Elongation at Break
200 - 700 %
120 %
Impact Strength (Izod)
N/A
100 J/m
Flexural Strength
—
70 MPa
Thermal
Glass Transition Temperature
-100 to -50 °C
80 °C
Melting Point
N/A
—
Continuous Service Temperature
-60 to 230 °C
65 °C
Heat Deflection Temperature
N/A
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.8 - 3.0
3.3
Volume Resistivity
10^13 - 10^15 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
15 - 30 kV/mm
—
Chemical resistance
Acids
Poor
Good
Bases
Poor
Fair
Solvents
Poor resistance to hydrocarbon solvents; swells
—
UV Resistance
Excellent
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Very Limited
Recyclable
Recycling Code
N/A
1
Carbon Footprint
High (energy intensive production)
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %