Epoxy vs. CAP

Epoxy belongs to the thermoset plastics classification, while CAP belongs to the thermoplastics. There are 13 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.

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

Epoxy Cellulose Acetate Propionate (CAP)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		4.5
Elongation at Break, %		35 to 50

Tensile Strength: Ultimate (UTS), MPa		67
Tensile Strength: Ultimate (UTS), MPa		28 to 45

Thermal Properties

Glass Transition Temperature, °C		120
Glass Transition Temperature, °C		190

Specific Heat Capacity, J/kg-K		1500
Specific Heat Capacity, J/kg-K		1480

Thermal Conductivity, W/m-K		0.2
Thermal Conductivity, W/m-K		0.25

Thermal Expansion, µm/m-K		100
Thermal Expansion, µm/m-K		14

Electrical Properties

Dielectric Strength (Breakdown Potential), kV/mm		16
Dielectric Strength (Breakdown Potential), kV/mm		15

Electrical Resistivity Order of Magnitude, 10^x Ω-m		13
Electrical Resistivity Order of Magnitude, 10^x Ω-m		16

Otherwise Unclassified Properties

Density, g/cm³		1.3
Density, g/cm³		1.2

Refractive Index		1.6
Refractive Index		1.5

Common Calculations

Strength to Weight: Axial, points		14
Strength to Weight: Axial, points		6.5 to 10

Strength to Weight: Bending, points		28
Strength to Weight: Bending, points		17 to 23

Thermal Diffusivity, mm²/s		0.1
Thermal Diffusivity, mm²/s		0.14