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FEP vs. Thermoplastic PI

Both FEP and thermoplastic PI are thermoplastics. There are 14 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 0.43
3.7 to 20
Elongation at Break, % 300
1.8 to 7.5
Flexural Modulus, GPa 0.6
3.8 to 19
Flexural Strength, MPa 24
170 to 330
Tensile Strength: Ultimate (UTS), MPa 20
110 to 220

Thermal Properties

Glass Transition Temperature, °C 60
260
Maximum Temperature: Autoignition, °C 630
600
Specific Heat Capacity, J/kg-K 1170
970 to 1100

Otherwise Unclassified Properties

Density, g/cm3 2.1
1.4 to 1.5
Limiting Oxygen Index (LOI), % 80
35

Common Calculations

Stiffness to Weight: Axial, points 0.11
1.5 to 7.9
Stiffness to Weight: Bending, points 12
37 to 64
Strength to Weight: Axial, points 2.6
22 to 42
Strength to Weight: Bending, points 7.6
36 to 57