FDS9 by Hoya
Obsolete
Unknown
Environmentally Dangerous
FDS9 by Hoya is an obsolete optical glass. It transmits from 0.37 to 1.55 µm with an nd of 1.846658 and a Vd of 23.826345. It has medium thermal expansion (CTE of 8.2×10⁻⁶/K), good chemical resistance, and dangerous environmental properties.
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) | 8.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 90.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.459 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| ZF52 | CDGM | 1.846669 | 23.827549 | |
| SF57HT | Schott | 1.84666 | 23.83 | |
| SF57 | Schott | 1.84666 | 23.83 | |
| SF57HTultra | Schott | 1.84666 | 23.83 | |
| K-SFLDn3 | Sumita | 1.8467 | 23.8 | |
| K-SFLDn3W | Sumita | 1.8467 | 23.8 | |
| H-ZF52A | CDGM | 1.84667 | 23.791236 | |
| H-ZF52TT | CDGM | 1.84666 | 23.784497 | |
| H-ZF52GT | CDGM | 1.84666 | 23.784497 | |
| H-ZF52 | CDGM | 1.84666 | 23.784497 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| FDS90-SGP | Hoya | 1.84666 | 23.84 | |
| FDS90-SG | Hoya | 1.84666 | 23.78 | |
| FDS90 | Hoya | 1.84666 | 23.78 | |
| NBFD25 | Hoya | 1.85451 | 25.15 | |
| NBFD26 | Hoya | 1.83401 | 25.97 | |
| MC-FDS910-50 | Hoya | 1.82165 | 24.04 | |
| MP-FDS910-50 | Hoya | 1.82165 | 24.04 | |
| M-FDS910 | Hoya | 1.82115 | 24.06 | |
| FDS20-W | Hoya | 1.86966 | 20.02 | |
| FD225 | Hoya | 1.80809 | 22.76 |