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Epoxy vs. Silicone Plastic

Both epoxy and silicone plastic are thermoset plastics. There are 16 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is epoxy and the bottom bar is silicone plastic.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 2.4
9.0
Tensile Strength: Ultimate (UTS), MPa 67
38

Thermal Properties

Glass Transition Temperature, °C 120
200
Maximum Temperature: Decomposition, °C 430
480
Specific Heat Capacity, J/kg-K 1500
850
Thermal Conductivity, W/m-K 0.2
0.35
Thermal Expansion, µm/m-K 100
35

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 16
30
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
12

Otherwise Unclassified Properties

Density, g/cm3 1.3
1.9

Common Calculations

Stiffness to Weight: Axial, points 1.0
2.6
Stiffness to Weight: Bending, points 34
36
Strength to Weight: Axial, points 14
5.5
Strength to Weight: Bending, points 28
13
Thermal Diffusivity, mm2/s 0.1
0.22
Thermal Shock Resistance, points 20
8.5