SK1 by Sumita
Obsolete
Very Rare
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) | 1.61025 |
|---|---|
| Abbe Number (Vd) | 56.5 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.54976 - 0.00973743\,\lambda^2 + 0.0149685\,\lambda^{-2} + 0.000429407\,\lambda^{-4} - 2.33535 \times 10^{-5}\,\lambda^{-6} + 1.55728 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 7.0 |
| 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) | 3.55 |
|---|---|
| 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 | |
|---|---|---|---|---|
| BACD1 | Hoya | 1.610248 | 56.650958 | |
| SK1 | Schott | 1.61025 | 56.712386 | |
| C07-57 | Corning | 1.607504 | 56.610495 | |
| SK2 | Schott | 1.607381 | 56.650108 | |
| N-SK2 | Schott | 1.60738 | 56.65 | |
| N-SK2HT | Schott | 1.60738 | 56.65 | |
| H-ZK50 | CDGM | 1.60738 | 56.654511 | |
| H-ZK50GT | CDGM | 1.60738 | 56.654511 | |
| BACD2 | Hoya | 1.60738 | 56.72 | |
| C13-56 | Corning | 1.613498 | 56.417725 |