K-SSK9 by Sumita
Standard
Rare
Environmentally Friendly
K-SSK9 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.62012 and a Vd of 49.8. It has medium thermal expansion (CTE of 8.3×10⁻⁶/K) and average chemical resistance.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.8 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.89 \times 10^{-6} + 2(1.55 \times 10^{-8})\,\Delta T + 3(-1.07 \times 10^{-10})\,\Delta T^2 + \frac{6.07 \times 10^{-7} + 2(4.29 \times 10^{-10})\,\Delta T}{\lambda - 0.203}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| BACED9 | Hoya | 1.620119 | 49.823001 | |
| N-SSK8 | Schott | 1.61773 | 49.83 | |
| S-BSM28 | Ohara | 1.617722 | 49.815052 | |
| SSKN8 | Schott | 1.61772 | 49.771451 | |
| BSM28 | Ohara | 1.617722 | 49.83232 | |
| N-SSK20 | Schott | 1.62568 | 50.2 | |
| BACED3 | Hoya | 1.614838 | 51.1513 | |
| SSK3 | Schott | 1.614837 | 51.1603 | |
| BSM23 | Ohara | 1.614839 | 51.172377 | |
| BAF5 | Hoya | 1.607292 | 49.336899 |