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CPVC vs. FEP

Both CPVC and FEP are thermoplastics. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 2.8
0.43
Elongation at Break, % 4.0
300
Flexural Modulus, GPa 2.5
0.6
Flexural Strength, MPa 100
24
Tensile Strength: Ultimate (UTS), MPa 50
20

Thermal Properties

Glass Transition Temperature, °C 100
60
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 91
50
Maximum Temperature: Autoignition, °C 640
630
Maximum Temperature: Mechanical, °C 80
200
Specific Heat Capacity, J/kg-K 780
1170
Thermal Conductivity, W/m-K 0.31
0.22
Thermal Expansion, µm/m-K 65
95

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 3.7
1.9
Dielectric Strength (Breakdown Potential), kV/mm 49
22
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
16

Otherwise Unclassified Properties

Density, g/cm3 1.5
2.1
Limiting Oxygen Index (LOI), % 57
80
Water Absorption After 24 Hours, % 0.030
0.010

Common Calculations

Stiffness to Weight: Axial, points 1.0
0.11
Stiffness to Weight: Bending, points 32
12
Strength to Weight: Axial, points 9.4
2.6
Strength to Weight: Bending, points 20
7.6
Thermal Diffusivity, mm2/s 0.27
0.088
Thermal Shock Resistance, points 20
35