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Silicone Plastic vs. RPU

Both silicone plastic and RPU are thermoset plastics. There are 15 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 9.0
2.2
Tensile Strength: Ultimate (UTS), MPa 38
60

Thermal Properties

Maximum Temperature: Decomposition, °C 480
270
Specific Heat Capacity, J/kg-K 850
1750
Thermal Conductivity, W/m-K 0.35
0.19
Thermal Expansion, µm/m-K 35
63

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm 30
19
Electrical Resistivity Order of Magnitude, 10x Ω-m 12
13

Otherwise Unclassified Properties

Density, g/cm3 1.9
1.2

Common Calculations

Stiffness to Weight: Axial, points 2.6
1.0
Stiffness to Weight: Bending, points 36
36
Strength to Weight: Axial, points 5.5
14
Strength to Weight: Bending, points 13
28
Thermal Diffusivity, mm2/s 0.22
0.090
Thermal Shock Resistance, points 8.5
31