Comparison
Silicone HTV for Molding vs PETG
A side-by-side comparison of High Temperature Vulcanizing Silicone Rubber and Polyethylene Terephthalate Glycol.
Physical
Density
1.10-1.25 g/cm³
1.27 g/cm³
Water Absorption (24h)
0.3-0.8 %
0.13 %
Transparency
Opaque to Translucent
Transparent
Shrinkage
1-2 %
0.2 – 0.5 %
Mechanical
Young's Modulus
0.01-0.05 GPa
2.1 GPa
Tensile Strength
4-10 MPa
50 MPa
Elongation at Break
200-800 %
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 250 °C
65 °C
Heat Deflection Temperature
N/A
70 °C
CTE
—
68 × 10⁻⁶ /K
Electrical
Dielectric Constant
2.5-3.5
3.3
Volume Resistivity
10^13-10^15 Ohm-cm
10¹⁴ Ω·cm
Dielectric Strength
18-28 kV/mm
—
Chemical resistance
Acids
Moderate resistance
Good
Bases
Moderate resistance
Fair
Solvents
Resistant to water and many dilute chemicals
—
UV Resistance
Excellent
Fair
Alcohols
—
Good
Oils
—
Good
Sustainability
Recyclability
Difficult
Recyclable
Recycling Code
N/A
1
Carbon Footprint
Moderate
~2.7 kg CO₂e / kg
Bio-based Content
—
0 %