N-SF56 by Schott
Obsolete
Unknown
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) | 1.7847 |
|---|---|
| Abbe Number (Vd) | 26.1 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.38 — 2.5 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.73562\,\lambda^2}{\lambda^2 - 0.0129625} + \frac{0.317487\,\lambda^2}{\lambda^2 - 0.0612884} + \frac{1.95398\,\lambda^2}{\lambda^2 - 161.559}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.7 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.0 |
| Thermal Conductivity (W/mK) | 0.94 |
| Heat Capacity (J/gK) | 0.7 |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.13 \times 10^{-6} + 2(7.65 \times 10^{-9})\,\Delta T + 3(-1.12 \times 10^{-11})\,\Delta T^2 + \frac{9.9 \times 10^{-7} + 2(1.57 \times 10^{-9})\,\Delta T}{\lambda - 0.287}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.28 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | 91.0 |
|---|---|
| Poisson's Ratio | 0.26 |
| Knoop Hardness (kgf/mm²) | 560.0 |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 1 |
| Alkali Resistance | 1 |
| Phosphate Resistance | 1 |
Notes
inquiry glass
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| FDS30 | Hoya | 1.784701 | 26.102957 | |
| ZF51 | CDGM | 1.784701 | 26.075871 | |
| FDS3 | Hoya | 1.7847 | 26.057653 | |
| SFS3 | Sumita | 1.7847 | 26.2 | |
| PBH23 | Ohara | 1.784702 | 26.216753 | |
| PBH23W | Ohara | 1.784702 | 26.216753 | |
| S-TIH23 | Ohara | 1.784696 | 26.291221 | |
| TIH23 | Ohara | 1.784696 | 26.29817 | |
| SFLD11 | Sumita | 1.78472 | 25.9 | |
| K-SFLD11 | Sumita | 1.78472 | 25.9 |