K-SKF6 by Sumita
Obsolete
Very Rare
Environmentally Friendly
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) | 1.512 |
|---|---|
| Abbe Number (Vd) | 52.1 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.25052 - 0.00886841\,\lambda^2 + 0.0122605\,\lambda^{-2} + 0.000422346\,\lambda^{-4} - 2.10951 \times 10^{-5}\,\lambda^{-6} + 2.24401 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 9.5 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-9.67 \times 10^{-6} + 2(1.6 \times 10^{-8})\,\Delta T + 3(-1.08 \times 10^{-10})\,\Delta T^2 + \frac{4.97 \times 10^{-7} + 2(6.44 \times 10^{-11})\,\Delta T}{\lambda - 0.231}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.51 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-KF6 | CDGM | 1.51742 | 52.149249 | |
| E-CF6 | Hoya | 1.51742 | 52.15 | |
| CF6 | Hoya | 1.517419 | 52.154512 | |
| KF6 | Schott | 1.517421 | 52.200088 | |
| NSL36 | Ohara | 1.517417 | 52.412251 | |
| S-NSL36 | Ohara | 1.517417 | 52.430903 | |
| FF1 | Hoya | 1.511179 | 51.02769 | |
| FTL8 | Ohara | 1.511179 | 51.020607 | |
| SSL5 | Ohara | 1.521299 | 52.553447 | |
| SBF5 | Hoya | 1.521299 | 52.780677 |