E-FD8 by Hoya
Standard
Rare
Environmentally Friendly
E-FD8 by Hoya is a standard optical glass with a rare melt frequency. It transmits from 0.36 to 1.55 µm with an nd of 1.68893 and a Vd of 31.16. It has medium thermal expansion (CTE of 9.3×10⁻⁶/K) and excellent chemical resistance.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
Thermal Properties
| TCE -30/70°C (10-6/K) | 9.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 11.2 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.08706 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
General glass Type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-ZF10 | CDGM | 1.68893 | 31.16057 | |
| SF8 | Schott | 1.688932 | 31.176063 | |
| ZF10 | CDGM | 1.688934 | 31.184753 | |
| SF8 | Sumita | 1.68893 | 31.2 | |
| K-SFLD8W | Sumita | 1.6891 | 31.2 | |
| C89-31 | Corning | 1.689004 | 31.210861 | |
| K-SFLD8 | Sumita | 1.68893 | 31.1 | |
| PBM28W | Ohara | 1.68893 | 31.082901 | |
| PBM28 | Ohara | 1.68893 | 31.082901 | |
| D-ZF10 | CDGM | 1.68893 | 31.077677 |