SF13 by Schott
Obsolete
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) | 1.740771 |
|---|---|
| Abbe Number (Vd) | 27.59998 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.65583\,\lambda^2}{\lambda^2 - 0.0131676} + \frac{0.257423\,\lambda^2}{\lambda^2 - 0.0604328} + \frac{1.09217\,\lambda^2}{\lambda^2 - 116.322}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.85 \times 10^{-6} + 2(1.64 \times 10^{-8})\,\Delta T + 3(-5.38 \times 10^{-11})\,\Delta T^2 + \frac{1.32 \times 10^{-6} + 2(1.37 \times 10^{-9})\,\Delta T}{\lambda - 0.273}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.36 |
|---|---|
| Relative Cost | 3.03 |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 1 |
| Alkali Resistance | 1 |
| Phosphate Resistance | 1 |
Notes
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Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| SF13 | Sumita | 1.74077 | 27.7 | |
| E-FD13 | Hoya | 1.74077 | 27.76 | |
| H-ZF50 | CDGM | 1.74077 | 27.760063 | |
| FD13 | Hoya | 1.740774 | 27.764991 | |
| ZF50 | CDGM | 1.74077 | 27.76788 | |
| S-TIH13 | Ohara | 1.740769 | 27.789359 | |
| PBH13 | Ohara | 1.740769 | 27.793228 | |
| PBH13W | Ohara | 1.740769 | 27.793228 | |
| D40-28 | Corning | 1.740001 | 28.102623 | |
| SF3 | Sumita | 1.74 | 28.2 |