E-FD7 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) | 1.6398 |
|---|---|
| Abbe Number (Vd) | 34.57 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{2.61659 - 0.0114279\,\lambda^2 + 0.0225344\,\lambda^{-2} + 0.00155129\,\lambda^{-4} - 0.000117699\,\lambda^{-6} + 1.24019 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.7 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.7 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.8611 \times 10^{-7} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.75 |
|---|---|
| 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 | |
|---|---|---|---|---|
| SF7 | Sumita | 1.6398 | 34.6 | |
| PBM27 | Ohara | 1.639799 | 34.477127 | |
| S-TIM27 | Ohara | 1.639799 | 34.466422 | |
| H-F51 | CDGM | 1.6398 | 34.46457 | |
| C37-35 | Corning | 1.636493 | 35.322642 | |
| F6 | Schott | 1.636359 | 35.341176 | |
| PBM6 | Ohara | 1.636358 | 35.376536 | |
| F7 | CDGM | 1.636365 | 35.386204 | |
| S-TIM6 | Ohara | 1.636358 | 35.391923 | |
| F6 | Sumita | 1.63636 | 35.4 |