SK9 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) | 1.61405 |
|---|---|
| Abbe Number (Vd) | 55.1 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.55986 - 0.00926848\,\lambda^2 + 0.0157416\,\lambda^{-2} + 0.000376967\,\lambda^{-4} - 1.45278 \times 10^{-5}\,\lambda^{-6} + 1.23968 \times 10^{-6}\,\lambda^{-8}}$$
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) | 3.59 |
|---|---|
| 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-ZK8 | CDGM | 1.61405 | 55.116283 | |
| BACD9 | Hoya | 1.614047 | 55.118097 | |
| S-BSM9 | Ohara | 1.614047 | 54.990097 | |
| BSM9 | Ohara | 1.614047 | 54.971106 | |
| C17-55 | Corning | 1.617605 | 55.123455 | |
| SSK4A | Schott | 1.61765 | 55.141867 | |
| BSM24 | Ohara | 1.617646 | 55.049782 | |
| BACED4 | Hoya | 1.617652 | 55.15751 | |
| H-ZK5 | CDGM | 1.61117 | 55.772437 | |
| BACD8 | Hoya | 1.611168 | 55.774369 |