Borosilicate Glass vs. PPA
Borosilicate glass and PPA belong to fundamentally different material chemistries. Borosilicate glass is a ceramic material, while PPA 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 (21, in this case) are not shown.
For each property being compared, the top bar is borosilicate glass and the bottom bar is PPA.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 67 to 80 | |
| 2.1 to 2.2 |
| Flexural Strength, MPa | 34 to 69 | |
| 95 to 110 |
| Poisson's Ratio | 0.21 | |
| 0.4 |
| Tensile Strength: Ultimate (UTS), MPa | 280 | |
| 57 to 69 |
Thermal Properties
| Melting Onset (Solidus), °C | 560 | |
| 310 |
| Specific Heat Capacity, J/kg-K | 830 | |
| 1400 |
| Thermal Conductivity, W/m-K | 1.2 | |
| 0.15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.2 to 2.6 | |
| 1.1 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 to 17 | |
| 1.0 to 1.1 |
| Stiffness to Weight: Bending, points | 55 to 61 | |
| 38 |
| Strength to Weight: Axial, points | 30 to 35 | |
| 14 to 17 |
| Strength to Weight: Bending, points | 36 to 43 | |
| 29 to 33 |
| Thermal Diffusivity, mm2/s | 0.54 to 0.63 | |
| 0.095 |