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Thermoset PI vs. Silicone Plastic

Both thermoset PI and silicone plastic are thermoset plastics. There are 12 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Tensile Strength: Ultimate (UTS), MPa 37 to 81
38

Thermal Properties

Glass Transition Temperature, °C 360
200
Maximum Temperature: Decomposition, °C 330
480
Specific Heat Capacity, J/kg-K 1130
850
Thermal Conductivity, W/m-K 0.29 to 1.7
0.35
Thermal Expansion, µm/m-K 38 to 54
35

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 20
30
Electrical Resistivity Order of Magnitude, 10x Ω-m 15
12

Otherwise Unclassified Properties

Density, g/cm3 1.4 to 1.6
1.9

Common Calculations

Strength to Weight: Axial, points 6.5 to 16
5.5
Strength to Weight: Bending, points 16 to 30
13
Thermal Diffusivity, mm2/s 0.18 to 0.95
0.22