F4 by Schott
Obsolete
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) | 1.616592 |
|---|---|
| Abbe Number (Vd) | 36.628072 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.32 — 2.5 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.33906\,\lambda^2}{\lambda^2 - 0.0099222} + \frac{0.205224\,\lambda^2}{\lambda^2 - 0.0470001} + \frac{0.89786\,\lambda^2}{\lambda^2 - 107.937}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.1 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.02 \times 10^{-6} + 2(1.97 \times 10^{-8})\,\Delta T + 3(-3.87 \times 10^{-11})\,\Delta T^2 + \frac{7.05 \times 10^{-7} + 2(4.36 \times 10^{-10})\,\Delta T}{\lambda - 0.289}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.58 |
|---|---|
| Relative Cost | 2.5 |
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 | 2 |
| Phosphate Resistance | 2 |
Notes
old
Similar Glasses (Other Manufacturers)
Similar Glasses (Schott)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| N-F2 | Schott | 1.62005 | 36.43 | |
| F2HTi | Schott | 1.62004 | 36.37 | |
| F2 | Schott | 1.62004 | 36.37 | |
| F2HT | Schott | 1.62004 | 36.37 | |
| F2G12 | Schott | 1.62072 | 36.56 | |
| F3 | Schott | 1.612931 | 37.038954 | |
| FN11 | Schott | 1.620962 | 36.179463 | |
| F13 | Schott | 1.622372 | 36.043399 | |
| F9 | Schott | 1.620451 | 38.080601 | |
| F1 | Schott | 1.625882 | 35.700495 |