Silicone Plastic vs. CAP

Silicone plastic belongs to the thermoset plastics classification, while CAP belongs to the thermoplastics. There are 11 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 silicone plastic and the bottom bar is CAP.

Silicone Plastic Cellulose Acetate Propionate (CAP)

Metric UnitsUS Customary Units

Mechanical Properties

Tensile Strength: Ultimate (UTS), MPa		38
Tensile Strength: Ultimate (UTS), MPa		28 to 45

Thermal Properties

Glass Transition Temperature, °C		200
Glass Transition Temperature, °C		190

Specific Heat Capacity, J/kg-K		850
Specific Heat Capacity, J/kg-K		1480

Thermal Conductivity, W/m-K		0.35
Thermal Conductivity, W/m-K		0.25

Thermal Expansion, µm/m-K		35
Thermal Expansion, µm/m-K		14

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm		30
Dielectric Strength (Breakdown Potential), kV/mm		15

Electrical Resistivity Order of Magnitude, 10^x Ω-m		12
Electrical Resistivity Order of Magnitude, 10^x Ω-m		16

Otherwise Unclassified Properties

Density, g/cm³		1.9
Density, g/cm³		1.2

Common Calculations

Strength to Weight: Axial, points		5.5
Strength to Weight: Axial, points		6.5 to 10

Strength to Weight: Bending, points		13
Strength to Weight: Bending, points		17 to 23

Thermal Diffusivity, mm²/s		0.22
Thermal Diffusivity, mm²/s		0.14