FEP vs. Tempered Soda-lime Glass
FEP and tempered soda-lime glass belong to fundamentally different material chemistries. FEP is a polymeric material, while tempered soda-lime glass is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 16 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.
For each property being compared, the top bar is FEP and the bottom bar is tempered soda-lime glass.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 0.43 | |
| 70 |
| Tensile Strength: Ultimate (UTS), MPa | 20 | |
| 180 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 200 | |
| 300 |
| Specific Heat Capacity, J/kg-K | 1170 | |
| 720 |
| Thermal Conductivity, W/m-K | 0.22 | |
| 1.1 |
| Thermal Expansion, µm/m-K | 95 | |
| 9.0 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 2.0 | |
| 7.3 |
| Dielectric Strength (Breakdown Potential), kV/mm | 22 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.1 | |
| 2.4 |
| Refractive Index | 1.4 | |
| 1.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 0.11 | |
| 16 |
| Stiffness to Weight: Bending, points | 12 | |
| 56 |
| Strength to Weight: Axial, points | 2.6 | |
| 20 |
| Strength to Weight: Bending, points | 7.6 | |
| 28 |
| Thermal Diffusivity, mm2/s | 0.088 | |
| 0.6 |
| Thermal Shock Resistance, points | 35 | |
| 20 |