SF13 by Sumita
Obsolete
Very Rare
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) | 1.74077 |
|---|---|
| Abbe Number (Vd) | 27.7 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.91922 - 0.0119633\,\lambda^2 + 0.0329964\,\lambda^{-2} + 0.00273629\,\lambda^{-4} - 0.000204752\,\lambda^{-6} + 2.31814 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 8.5 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.4 |
|---|---|
| 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 | |
|---|---|---|---|---|
| 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 | |
| SF13 | Schott | 1.740771 | 27.59998 | |
| SF54 | Schott | 1.7408 | 28.090813 | |
| D40-28 | Corning | 1.740001 | 28.102623 |