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CAB vs. FEP

Both CAB and FEP are thermoplastics. There are 20 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is CAB and the bottom bar is FEP.

Metric UnitsUS Customary Units

Mechanical Properties

Elongation at Break, % 50 to 55
300
Flexural Modulus, GPa 0.8 to 1.7
0.6
Flexural Strength, MPa 21 to 57
24
Tensile Strength: Ultimate (UTS), MPa 20 to 50
20

Thermal Properties

Glass Transition Temperature, °C 140
60
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 53 to 82
50
Heat Deflection Temperature At 455 kPa (66 psi), °C 68 to 92
70
Specific Heat Capacity, J/kg-K 1460
1170
Thermal Conductivity, W/m-K 0.25
0.22
Thermal Expansion, µm/m-K 14
95

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 3.6
2.0
Dielectric Strength (Breakdown Potential), kV/mm 15
22
Electrical Resistivity Order of Magnitude, 10x Ω-m 16
16

Otherwise Unclassified Properties

Density, g/cm3 1.2
2.1
Limiting Oxygen Index (LOI), % 18
80
Refractive Index 1.5
1.4
Water Absorption After 24 Hours, % 1.2 to 1.6
0.010

Common Calculations

Strength to Weight: Axial, points 4.8 to 12
2.6
Strength to Weight: Bending, points 14 to 25
7.6
Thermal Diffusivity, mm2/s 0.14 to 0.15
0.088