K4 by Schott
Obsolete
Unknown
Environmentally Dangerous
K4 by Schott is an obsolete optical glass. It transmits from 0.33 to 0.85 µm with an nd of 1.518952 and a Vd of 57.399398. It has medium thermal expansion (CTE of 7.3×10⁻⁶/K) and dangerous environmental properties.
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) | 1.518952 |
|---|---|
| Abbe Number (Vd) | 57.399398 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.18909\,\lambda^2}{\lambda^2 - 0.00789397} + \frac{0.0841359\,\lambda^2}{\lambda^2 - 0.0339219} + \frac{0.93022\,\lambda^2}{\lambda^2 - 107.049}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.4 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.85 \times 10^{-6} + 2(2.08 \times 10^{-8})\,\Delta T + 3(7.15 \times 10^{-11})\,\Delta T^2 + \frac{5.66 \times 10^{-7} + 2(5.14 \times 10^{-11})\,\Delta T}{\lambda - 0.186}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
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Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| S-NSL2 | Ohara | 1.516016 | 56.858179 | |
| NSL2 | Ohara | 1.516016 | 56.800755 | |
| H-K8 | CDGM | 1.51602 | 56.794825 | |
| C2 | Hoya | 1.51602 | 56.771193 | |
| H-K51 | CDGM | 1.52307 | 58.639792 | |
| C12 | Hoya | 1.523073 | 58.640203 | |
| S-NSL3 | Ohara | 1.518229 | 58.902057 | |
| H-K10 | CDGM | 1.51818 | 58.949331 | |
| E-C3 | Hoya | 1.51823 | 58.96 | |
| C3 | Hoya | 1.518234 | 58.96082 |
Similar Glasses (Schott)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| K5G20 | Schott | 1.52344 | 56.76 | |
| B270 | Schott | 1.52308 | 58.571369 | |
| K3 | Schott | 1.51823 | 58.976559 | |
| ZK1 | Schott | 1.533149 | 57.980912 | |
| N-K5 | Schott | 1.52249 | 59.48 | |
| K5 | Schott | 1.522489 | 59.482671 | |
| K5HT | Schott | 1.522453 | 59.530889 | |
| K10 | Schott | 1.50137 | 56.41 | |
| KF3 | Schott | 1.51454 | 54.702547 | |
| K50 | Schott | 1.522572 | 60.179756 |