SF4 by Schott
Preferred
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) | 1.7552 |
|---|---|
| Abbe Number (Vd) | 27.58 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.365 — 2.5 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.61958\,\lambda^2}{\lambda^2 - 0.0125502} + \frac{0.339493\,\lambda^2}{\lambda^2 - 0.054456} + \frac{1.02567\,\lambda^2}{\lambda^2 - 117.652}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.0 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.9 |
| Thermal Conductivity (W/mK) | 0.65 |
| Heat Capacity (J/gK) | 0.41 |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.6 \times 10^{-6} + 2(1.7 \times 10^{-8})\,\Delta T + 3(-5.27 \times 10^{-11})\,\Delta T^2 + \frac{1.54 \times 10^{-6} + 2(1.46 \times 10^{-9})\,\Delta T}{\lambda - 0.266}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.79 |
|---|---|
| Relative Cost | 1.9 |
Mechanical Properties
| Young's Modulus (GPa) | 56.0 |
|---|---|
| Poisson's Ratio | 0.24 |
| Knoop Hardness (kgf/mm²) | 390.0 |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 2 |
| Acid Resistance | 4 |
| Alkali Resistance | 2 |
| Phosphate Resistance | 3 |
Notes
lead containing glass type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| D56-27 | Corning | 1.755203 | 27.591377 | |
| ZF6 | CDGM | 1.755205 | 27.546239 | |
| FD4 | Hoya | 1.755199 | 27.530242 | |
| H-ZF6 | CDGM | 1.7552 | 27.530047 | |
| E-FD4L | Hoya | 1.7552 | 27.53 | |
| E-FD4 | Hoya | 1.7552 | 27.53 | |
| PBH4W | Ohara | 1.755199 | 27.512146 | |
| PBH4 | Ohara | 1.755199 | 27.512146 | |
| S-TIH4 | Ohara | 1.755199 | 27.512089 | |
| SF4 | Sumita | 1.7552 | 27.5 |