K-SFLD8 by Sumita
Standard
Rare
Environmentally Friendly
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) | 1.68893 |
|---|---|
| Abbe Number (Vd) | 31.1 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.4 — 1.55 µm |
$$n(\lambda) = \sqrt{2.76092 - 0.0116014\,\lambda^2 + 0.0293097\,\lambda^{-2} + 0.00129572\,\lambda^{-4} - 3.69711 \times 10^{-5}\,\lambda^{-6} + 9.87235 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.0 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.7 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-9.37 \times 10^{-7} + 2(1.62 \times 10^{-8})\,\Delta T + 3(-1.83 \times 10^{-10})\,\Delta T^2 + \frac{7.05 \times 10^{-7} + 2(1.05 \times 10^{-9})\,\Delta T}{\lambda - 0.299}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.94 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| PBM28W | Ohara | 1.68893 | 31.082901 | |
| PBM28 | Ohara | 1.68893 | 31.082901 | |
| D-ZF10 | CDGM | 1.68893 | 31.077677 | |
| S-TIM28 | Ohara | 1.688931 | 31.07545 | |
| FD8 | Hoya | 1.688931 | 31.158857 | |
| M-FD80 | Hoya | 1.68893 | 31.16 | |
| MC-FD80 | Hoya | 1.68893 | 31.16 | |
| E-FD8 | Hoya | 1.68893 | 31.16 | |
| MP-FD80 | Hoya | 1.68893 | 31.16 | |
| H-ZF10 | CDGM | 1.68893 | 31.16057 |