FEP vs. PAR
Both FEP and PAR are thermoplastics. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is FEP and the bottom bar is PAR.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 0.43 | |
2.0 |
Elongation at Break, % | 300 | |
50 |
Flexural Modulus, GPa | 0.6 | |
2.1 |
Flexural Strength, MPa | 24 | |
75 |
Tensile Strength: Ultimate (UTS), MPa | 20 | |
67 |
Thermal Properties
Glass Transition Temperature, °C | 60 | |
190 |
Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 50 | |
170 |
Heat Deflection Temperature At 455 kPa (66 psi), °C | 70 | |
180 |
Specific Heat Capacity, J/kg-K | 1170 | |
1200 |
Thermal Conductivity, W/m-K | 0.22 | |
0.18 |
Thermal Expansion, µm/m-K | 95 | |
88 |
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz | 1.9 | |
3.0 |
Dielectric Strength (Breakdown Potential), kV/mm | 22 | |
16 |
Electrical Resistivity Order of Magnitude, 10x Ω-m | 16 | |
12 |
Otherwise Unclassified Properties
Density, g/cm3 | 2.1 | |
1.2 |
Limiting Oxygen Index (LOI), % | 80 | |
35 |
Water Absorption After 24 Hours, % | 0.010 | |
0.26 |
Common Calculations
Stiffness to Weight: Axial, points | 0.11 | |
0.93 |
Stiffness to Weight: Bending, points | 12 | |
35 |
Strength to Weight: Axial, points | 2.6 | |
16 |
Strength to Weight: Bending, points | 7.6 | |
31 |
Thermal Diffusivity, mm2/s | 0.088 | |
0.13 |
Thermal Shock Resistance, points | 35 | |
27 |