SK15 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) | 1.62299 |
|---|---|
| Abbe Number (Vd) | 58.1 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.59112 - 0.0101598\,\lambda^2 + 0.0148702\,\lambda^{-2} + 0.000503891\,\lambda^{-4} - 4.15525 \times 10^{-5}\,\lambda^{-6} + 2.64513 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 8.0 |
| 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) | 3.67 |
|---|---|
| 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 | |
|---|---|---|---|---|
| C23-58 | Corning | 1.623004 | 58.102071 | |
| BACD15 | Hoya | 1.62299 | 58.12 | |
| H-ZK21 | CDGM | 1.62299 | 58.120667 | |
| SK15 | Schott | 1.62299 | 58.059722 | |
| BSM15 | Ohara | 1.622992 | 58.143312 | |
| D-ZK21-25 | CDGM | 1.62346 | 58.115078 | |
| S-BSM15 | Ohara | 1.622992 | 58.165763 | |
| N-SK15 | Schott | 1.62296 | 58.02 | |
| M-BACD15 | Hoya | 1.62263 | 58.17 | |
| MP-BACD15 | Hoya | 1.62263 | 58.17 |