FF2 by Hoya
Obsolete
Unknown
Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
No transmission data available.
Optical Properties
| Refractive Index (nd) | 1.532561 |
|---|---|
| Abbe Number (Vd) | 45.942878 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{2.30476 - 0.00882413\,\lambda^2 + 0.0153933\,\lambda^{-2} + 0.00022232\,\lambda^{-4} + 1.85817 \times 10^{-5}\,\lambda^{-6} + 1.77229 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
| Density (g/cm³) | — |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| FTM8 | Ohara | 1.532565 | 45.914102 | |
| LLF8 | Sumita | 1.53256 | 46.0 | |
| LLF2 | Schott | 1.540719 | 47.171344 | |
| QF8 | CDGM | 1.540718 | 47.198243 | |
| LLF2 | Sumita | 1.54072 | 47.2 | |
| S-TIL2 | Ohara | 1.54072 | 47.227127 | |
| H-QF8 | CDGM | 1.54072 | 47.230007 | |
| PBL2 | Ohara | 1.54072 | 47.23368 | |
| QF1 | CDGM | 1.5481 | 45.886233 | |
| LLF1 | Sumita | 1.54814 | 45.9 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| FEL2 | Hoya | 1.540718 | 47.198247 | |
| E-FEL2 | Hoya | 1.54072 | 47.2 | |
| FEL1 | Hoya | 1.548136 | 45.822169 | |
| E-FEL1 | Hoya | 1.54814 | 45.82 | |
| FEL7 | Hoya | 1.54883 | 45.439785 | |
| FEL6 | Hoya | 1.53172 | 48.837531 | |
| E-FEL6 | Hoya | 1.53172 | 48.84 | |
| FEL3 | Hoya | 1.560125 | 47.090971 | |
| FEL4 | Hoya | 1.561379 | 45.226718 | |
| SBF1 | Hoya | 1.551151 | 49.517289 |