E-F8 by Hoya
Special
Rare
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) | 1.59551 |
|---|---|
| Abbe Number (Vd) | 39.22 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{2.48666 - 0.0101885\,\lambda^2 + 0.0192874\,\lambda^{-2} + 0.000885537\,\lambda^{-4} - 5.09371 \times 10^{-5}\,\lambda^{-6} + 6.4257 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.25928 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.62 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Not in a position to accept new order because of discontinuation.
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-QF14 | CDGM | 1.59551 | 39.222748 | |
| PBM8 | Ohara | 1.595508 | 39.213424 | |
| F8 | Sumita | 1.59551 | 39.2 | |
| S-TIM8 | Ohara | 1.595509 | 39.242273 | |
| PBM8Y | Ohara | 1.595509 | 39.260208 | |
| F8 | Schott | 1.59551 | 39.179444 | |
| F8HT | Schott | 1.59551 | 39.179444 | |
| PBM18Y | Ohara | 1.595509 | 38.767114 | |
| LF5G19 | Schott | 1.59655 | 39.89 | |
| F14HT | Schott | 1.601389 | 38.266237 |