FEP vs. PS
Both FEP and PS are thermoplastics. There are 21 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is FEP and the bottom bar is PS.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 0.43 | |
| 1.9 to 2.9 |
| Elongation at Break, % | 300 | |
| 1.8 to 40 |
| Flexural Strength, MPa | 24 | |
| 62 to 80 |
| Tensile Strength: Ultimate (UTS), MPa | 20 | |
| 32 to 44 |
Thermal Properties
| Glass Transition Temperature, °C | 60 | |
| 100 |
| Maximum Temperature: Autoignition, °C | 630 | |
| 360 to 420 |
| Maximum Temperature: Mechanical, °C | 200 | |
| 70 |
| Specific Heat Capacity, J/kg-K | 1170 | |
| 1250 to 1400 |
| Thermal Conductivity, W/m-K | 0.22 | |
| 0.14 to 0.22 |
| Thermal Expansion, µm/m-K | 95 | |
| 80 to 98 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 22 | |
| 18 to 20 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 16 | |
| 14 to 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.1 | |
| 1.0 |
| Limiting Oxygen Index (LOI), % | 80 | |
| 18 |
| Water Absorption After 24 Hours, % | 0.010 | |
| 0.040 to 0.080 |
Common Calculations
| Stiffness to Weight: Axial, points | 0.11 | |
| 1.0 to 1.5 |
| Stiffness to Weight: Bending, points | 12 | |
| 40 to 45 |
| Strength to Weight: Axial, points | 2.6 | |
| 8.5 to 12 |
| Strength to Weight: Bending, points | 7.6 | |
| 22 to 26 |
| Thermal Diffusivity, mm2/s | 0.088 | |
| 0.11 to 0.15 |
| Thermal Shock Resistance, points | 35 | |
| 11 to 15 |