K-SFLD14 by Sumita
Standard
Rare
Environmentally Friendly
K-SFLD14 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.37 to 2.00 µm with an nd of 1.76182 and a Vd of 26.5. It has medium thermal expansion (CTE of 8.5×10⁻⁶/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) | 8.5 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.2 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.13 \times 10^{-6} + 2(1.55 \times 10^{-8})\,\Delta T + 3(-2.99 \times 10^{-10})\,\Delta T^2 + \frac{9.65 \times 10^{-7} + 2(1.53 \times 10^{-9})\,\Delta T}{\lambda - 0.29}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| S-TIH14 | Ohara | 1.761821 | 26.517885 | |
| TIH14 | Ohara | 1.761821 | 26.517966 | |
| SF14 | Schott | 1.76182 | 26.53 | |
| N-SF14 | Schott | 1.76182 | 26.53 | |
| FD14 | Hoya | 1.761823 | 26.552048 | |
| PBH14 | Ohara | 1.761819 | 26.553651 | |
| PBH14W | Ohara | 1.761819 | 26.553651 | |
| ZF12 | CDGM | 1.761822 | 26.555686 | |
| H-ZF12 | CDGM | 1.76182 | 26.607986 | |
| FD140 | Hoya | 1.76182 | 26.61 |