SF56A by Schott
Preferred
Unknown
Environmentally Dangerous
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) | 26.08 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.37 — 2.5 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.70579\,\lambda^2}{\lambda^2 - 0.0133875} + \frac{0.344223\,\lambda^2}{\lambda^2 - 0.0579562} + \frac{1.09602\,\lambda^2}{\lambda^2 - 121.616}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.8 |
| Thermal Conductivity (W/mK) | 0.69 |
| Heat Capacity (J/gK) | 0.4 |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.02 \times 10^{-6} + 2(1.7 \times 10^{-8})\,\Delta T + 3(-2.61 \times 10^{-11})\,\Delta T^2 + \frac{1.63 \times 10^{-6} + 2(1.59 \times 10^{-9})\,\Delta T}{\lambda - 0.269}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.92 |
|---|---|
| Relative Cost | 2.7 |
Mechanical Properties
| Young's Modulus (GPa) | 57.0 |
|---|---|
| Poisson's Ratio | 0.24 |
| Knoop Hardness (kgf/mm²) | 380.0 |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 3 |
| Alkali Resistance | 2 |
| Phosphate Resistance | 3 |
Notes
lead containing glass type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| ZF51 | CDGM | 1.784701 | 26.075871 | |
| FDS3 | Hoya | 1.7847 | 26.057653 | |
| FDS30 | Hoya | 1.784701 | 26.102957 | |
| SFS3 | Sumita | 1.7847 | 26.2 | |
| PBH23 | Ohara | 1.784702 | 26.216753 | |
| PBH23W | Ohara | 1.784702 | 26.216753 | |
| SFLD11 | Sumita | 1.78472 | 25.9 | |
| K-SFLD11 | Sumita | 1.78472 | 25.9 | |
| D85-26 | Corning | 1.784994 | 25.902085 | |
| S-TIH23 | Ohara | 1.784696 | 26.291221 |