B270 by Schott
Special
Unknown
Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
No transmission data available.
Optical Properties
| Refractive Index (nd) | 1.52308 |
|---|---|
| Abbe Number (Vd) | 58.571369 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.334 — 2.5 µm |
$$n(\lambda) = \sqrt{2.28658 - 0.00873346\,\lambda^2 + 0.0117429\,\lambda^{-2} + 0.000290418\,\lambda^{-4} - 1.25067 \times 10^{-5}\,\lambda^{-6} + 9.26463 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.5 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.54 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
Similar Glasses (Schott)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K3 | Schott | 1.51823 | 58.976559 | |
| N-K5 | Schott | 1.52249 | 59.48 | |
| K5 | Schott | 1.522489 | 59.482671 | |
| K5HT | Schott | 1.522453 | 59.530889 | |
| K4 | Schott | 1.518952 | 57.399398 | |
| ZK1 | Schott | 1.533149 | 57.980912 | |
| K50 | Schott | 1.522572 | 60.179756 | |
| BALKN3 | Schott | 1.518489 | 60.259571 | |
| K5G20 | Schott | 1.52344 | 56.76 | |
| UK50 | Schott | 1.522571 | 60.383109 |