Soda-lime Glass vs. RPU
Soda-lime glass and RPU belong to fundamentally different material chemistries. Soda-lime glass is a ceramic material, while RPU is polymeric. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 13 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is soda-lime glass and the bottom bar is RPU.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 70 to 71 | |
| 2.2 |
| Tensile Strength: Ultimate (UTS), MPa | 41 to 180 | |
| 60 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 720 to 800 | |
| 1750 |
| Thermal Conductivity, W/m-K | 1.0 to 1.1 | |
| 0.19 |
| Thermal Expansion, µm/m-K | 8.8 to 9.0 | |
| 63 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 13 | |
| 19 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.4 | |
| 1.2 |
Common Calculations
| Stiffness to Weight: Axial, points | 16 | |
| 1.0 |
| Stiffness to Weight: Bending, points | 56 | |
| 36 |
| Strength to Weight: Axial, points | 4.6 to 20 | |
| 14 |
| Strength to Weight: Bending, points | 11 to 28 | |
| 28 |
| Thermal Diffusivity, mm2/s | 0.51 to 0.6 | |
| 0.090 |
| Thermal Shock Resistance, points | 4.7 to 20 | |
| 31 |