| Property | Float glass (capillary glass) | Modified aluminosilicate glass |
| Density [kg/m3] | 2500 | 2477 |
| Bending tensile strength [N/mm2] | 45 | 200 |
| Young’s Modulus [N/mm2] | 70,000 | 74,000 |
| Middle thermal coefficient of expansion [1/K] | 9.0 × 10−6 | 8.8 × 10−6 |
| Refractive index | ≈1.52 | 1.508 |