Soda-lime Glass vs. PBI
Soda-lime glass and PBI belong to fundamentally different material chemistries. Soda-lime glass is a ceramic material, while PBI is polymeric. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 15 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 soda-lime glass and the bottom bar is PBI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 70 to 71 | |
| 5.9 |
| Tensile Strength: Ultimate (UTS), MPa | 41 to 180 | |
| 160 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 300 | |
| 340 |
| Specific Heat Capacity, J/kg-K | 720 to 800 | |
| 930 |
| Thermal Conductivity, W/m-K | 1.0 to 1.1 | |
| 0.41 |
| Thermal Expansion, µm/m-K | 8.8 to 9.0 | |
| 23 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 7.3 to 7.4 | |
| 3.8 |
| Dielectric Strength (Breakdown Potential), kV/mm | 13 | |
| 23 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.4 | |
| 1.3 |
Common Calculations
| Stiffness to Weight: Axial, points | 16 | |
| 2.5 |
| Stiffness to Weight: Bending, points | 56 | |
| 46 |
| Strength to Weight: Axial, points | 4.6 to 20 | |
| 34 |
| Strength to Weight: Bending, points | 11 to 28 | |
| 50 |
| Thermal Diffusivity, mm2/s | 0.51 to 0.6 | |
| 0.34 |
| Thermal Shock Resistance, points | 4.7 to 20 | |
| 84 |