K-SFLD66 by Sumita
Obsolete
Very Rare
Environmentally Friendly
K-SFLD66 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.37 to 2.00 µm with an nd of 1.79925 and a Vd of 24.6. It has medium thermal expansion (CTE of 8.7×10⁻⁶/K) and excellent 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) | 8.7 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.7 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-6.63 \times 10^{-6} + 2(1.28 \times 10^{-8})\,\Delta T + 3(-1.8 \times 10^{-10})\,\Delta T^2 + \frac{1.03 \times 10^{-6} + 2(1.51 \times 10^{-9})\,\Delta T}{\lambda - 0.29}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| N-SF6HTultra | Schott | 1.80518 | 25.36 | |
| N-SF6HT | Schott | 1.80518 | 25.36 | |
| N-SF6 | Schott | 1.80518 | 25.36 | |
| SFL6 | Schott | 1.80518 | 25.39 | |
| S-TIH6 | Ohara | 1.805181 | 25.425363 | |
| SF6 | Schott | 1.80518 | 25.43 | |
| SF6HT | Schott | 1.80518 | 25.43 | |
| TIH6 | Ohara | 1.805181 | 25.432057 | |
| PBH6 | Ohara | 1.805177 | 25.435012 | |
| PBH6W | Ohara | 1.805177 | 25.435012 |