Comparison
Silicone HTV for Molding vs PA66
A side-by-side comparison of High Temperature Vulcanizing Silicone Rubber and Polyamide 6,6 (Nylon).
Physical
Density
1.10-1.25 g/cm³
1.14 g/cm³
Water Absorption (24h)
0.3-0.8 %
1.2 %
Transparency
Opaque to Translucent
Opaque
Shrinkage
1-2 %
1.5 – 2.0 %
Mechanical
Young's Modulus
0.01-0.05 GPa
3.0 GPa (dry)
Tensile Strength
4-10 MPa
80 MPa
Elongation at Break
200-800 %
60 %
Impact Strength (Izod)
N/A
50 J/m
Flexural Strength
—
110 MPa
Thermal
Glass Transition Temperature
-100 to -50 °C
70 °C
Melting Point
N/A
255 – 265 °C
Continuous Service Temperature
-60 to 250 °C
100 – 120 °C
Heat Deflection Temperature
N/A
75 °C (unfilled)
Electrical
Dielectric Constant
2.5-3.5
4.0
Volume Resistivity
10^13-10^15 Ohm-cm
10¹² Ω·cm
Dielectric Strength
18-28 kV/mm
—
Chemical resistance
Acids
Moderate resistance
Poor
Bases
Moderate resistance
Good
Solvents
Resistant to water and many dilute chemicals
—
UV Resistance
Excellent
Fair
Alcohols
—
Good
Oils & Fuels
—
Excellent
Sustainability
Recyclability
Difficult
Recyclable
Recycling Code
N/A
7
Carbon Footprint
Moderate
~7.4 kg CO₂e / kg
Bio-based Content
—
0 – 100 % (bio grades)