N-SF4 by Schott
Preferred
Unknown
Environmentally Friendly
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) | 1.75513 |
|---|---|
| Abbe Number (Vd) | 27.38 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.365 — 2.5 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.6778\,\lambda^2}{\lambda^2 - 0.0126793} + \frac{0.28285\,\lambda^2}{\lambda^2 - 0.0602038} + \frac{1.63539\,\lambda^2}{\lambda^2 - 145.76}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 9.45 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.87 |
| Thermal Conductivity (W/mK) | 0.95 |
| Heat Capacity (J/gK) | 0.76 |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.88 \times 10^{-6} + 2(6.57 \times 10^{-9})\,\Delta T + 3(-2.72 \times 10^{-11})\,\Delta T^2 + \frac{9.67 \times 10^{-7} + 2(1.48 \times 10^{-9})\,\Delta T}{\lambda - 0.282}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.145 |
|---|---|
| Relative Cost | 2.9 |
Mechanical Properties
| Young's Modulus (GPa) | 90.0 |
|---|---|
| Poisson's Ratio | 0.26 |
| Knoop Hardness (kgf/mm²) | 520.0 |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 1 |
| Alkali Resistance | 1 |
| Phosphate Resistance | 1 |