SFN1 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) | 1.72022 |
|---|---|
| Abbe Number (Vd) | 29.3 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.85556 - 0.0102829\,\lambda^2 + 0.0317191\,\lambda^{-2} + 0.00204308\,\lambda^{-4} - 0.000119621\,\lambda^{-6} + 1.44857 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 8.8 |
| 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) | 4.49 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 2 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| FD20 | Hoya | 1.720225 | 29.300359 | |
| SF18 | Schott | 1.72151 | 29.245495 | |
| PBH18 | Ohara | 1.721506 | 29.243262 | |
| FD18 | Hoya | 1.721507 | 29.243436 | |
| S-TIH18 | Ohara | 1.721507 | 29.23233 | |
| P-SF69 | Schott | 1.7225 | 29.23 | |
| D17-29 | Corning | 1.717409 | 29.492751 | |
| H-ZF3 | CDGM | 1.71736 | 29.49911 | |
| E-FD1L | Hoya | 1.71736 | 29.5 | |
| E-FD1 | Hoya | 1.71736 | 29.5 |