CAP vs. ECTFE

Both CAP and ECTFE are thermoplastics. There are 17 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 CAP and the bottom bar is ECTFE.

Cellulose Acetate Propionate (CAP)Ethylene Chlorotrifluoroethylene (ECTFE)

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, %		35 to 50
Elongation at Break, %		230

Flexural Modulus, GPa		1.2 to 1.9
Flexural Modulus, GPa		1.7

Flexural Strength, MPa		29 to 56
Flexural Strength, MPa		47

Tensile Strength: Ultimate (UTS), MPa		28 to 45
Tensile Strength: Ultimate (UTS), MPa		49

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C		65 to 80
Heat Deflection Temperature At 1.82 MPa (264 psi), °C		91

Heat Deflection Temperature At 455 kPa (66 psi), °C		75 to 90
Heat Deflection Temperature At 455 kPa (66 psi), °C		110

Specific Heat Capacity, J/kg-K		1480
Specific Heat Capacity, J/kg-K		1170

Thermal Conductivity, W/m-K		0.25
Thermal Conductivity, W/m-K		0.15

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

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz		3.6
Dielectric Constant (Relative Permittivity) At 1 MHz		2.6

Dielectric Strength (Breakdown Potential), kV/mm		15
Dielectric Strength (Breakdown Potential), kV/mm		18

Electrical Resistivity Order of Magnitude, 10^x Ω-m		16
Electrical Resistivity Order of Magnitude, 10^x Ω-m		14

Otherwise Unclassified Properties

Density, g/cm³		1.2
Density, g/cm³		1.7

Water Absorption After 24 Hours, %		1.4 to 1.7
Water Absorption After 24 Hours, %		0.094

Common Calculations

Strength to Weight: Axial, points		6.5 to 10
Strength to Weight: Axial, points		8.1

Strength to Weight: Bending, points		17 to 23
Strength to Weight: Bending, points		18

Thermal Diffusivity, mm²/s		0.14
Thermal Diffusivity, mm²/s		0.078