K-SK15 by Sumita
Standard
Rare
Environmentally Friendly
K-SK15 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.29 to 2.00 µm with an nd of 1.62299 and a Vd of 58.1. It has medium thermal expansion (CTE of 6.8×10⁻⁶/K) and below 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) | 6.8 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.08 \times 10^{-6} + 2(1.69 \times 10^{-8})\,\Delta T + 3(-2.15 \times 10^{-10})\,\Delta T^2 + \frac{4.4 \times 10^{-7} + 2(6.37 \times 10^{-10})\,\Delta T}{\lambda - 0.19}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 3 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| 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 |