K7HT by Schott
Obsolete
Unknown
Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
| Refractive Index (nd) | 1.511144 |
|---|---|
| Abbe Number (Vd) | 60.466081 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.10108\,\lambda^2}{\lambda^2 - 0.00687551} + \frac{0.15087\,\lambda^2}{\lambda^2 - 0.0256582} + \frac{0.902837\,\lambda^2}{\lambda^2 - 108.518}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.4 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.7 |
| 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) | 2.53 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 3 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 2 |
| Alkali Resistance | 1 |
| Phosphate Resistance | 2 |
Notes
old, High UV Transmission; glass data moved from former "I_LINE" catalog
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-K6 | CDGM | 1.511125 | 60.478905 | |
| NSL7 | Ohara | 1.511121 | 60.485793 | |
| C7 | Hoya | 1.511122 | 60.485929 | |
| K7 | Sumita | 1.51112 | 60.5 | |
| B11-60 | Corning | 1.510999 | 60.383147 | |
| H-K7 | CDGM | 1.51478 | 60.634896 | |
| K4A | CDGM | 1.50802 | 61.052897 | |
| ZNC7 | Hoya | 1.508471 | 61.266087 | |
| B18-60 | Corning | 1.518201 | 60.291781 | |
| BACL3 | Hoya | 1.518351 | 60.396486 |
Similar Glasses (Schott)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K7 | Schott | 1.51112 | 60.41 | |
| N-ZK7A | Schott | 1.508054 | 61.04 | |
| ZKN7 | Schott | 1.508469 | 61.187789 | |
| N-ZK7 | Schott | 1.50847 | 61.19 | |
| BALKN3 | Schott | 1.518489 | 60.259571 | |
| UK50 | Schott | 1.522571 | 60.383109 | |
| K50 | Schott | 1.522572 | 60.179756 | |
| K3 | Schott | 1.51823 | 58.976559 | |
| K11 | Schott | 1.50013 | 61.438579 | |
| K5HT | Schott | 1.522453 | 59.530889 |