FDS18 by Hoya
Standard
Rare
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) | 1.94595 |
|---|---|
| Abbe Number (Vd) | 17.98 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{3.56378 - 0.0254496\,\lambda^2 + 0.0584017\,\lambda^{-2} + 0.0092311\,\lambda^{-4} - 0.000954997\,\lambda^{-6} + 0.000117775\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.4 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.1 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.61 \times 10^{-6} + 2(1.15 \times 10^{-8})\,\Delta T + 3(-4.58 \times 10^{-11})\,\Delta T^2 + \frac{1.17 \times 10^{-6} + 2(1.89 \times 10^{-9})\,\Delta T}{\lambda - 0.324}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.51 |
|---|---|
| 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
General glass Type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-ZF88GT | CDGM | 1.94595 | 17.941964 | |
| H-ZF88 | CDGM | 1.94595 | 17.941964 | |
| H-ZF73 | CDGM | 1.95906 | 17.472434 | |
| H-ZF73GT | CDGM | 1.95906 | 17.472434 | |
| S-NPH3 | Ohara | 1.95906 | 17.471252 | |
| SF59 | Schott | 1.952497 | 20.363706 | |
| H-ZF72A | CDGM | 1.92286 | 18.895887 | |
| H-ZF72AGT | CDGM | 1.92286 | 18.895887 | |
| S-NPH2 | Ohara | 1.92286 | 18.896912 | |
| H-ZF62 | CDGM | 1.92286 | 20.879915 |