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 %