FL6 by Hoya
Obsolete
Unknown
Environmentally Dangerous
FL6 by Hoya is an obsolete optical glass. It transmits from 0.32 to 0.70 µm with an nd of 1.567324 and a Vd of 42.843119. It has medium thermal expansion (CTE of 7.9×10⁻⁶/K), excellent 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
| Refractive Index (nd) | 1.567324 |
|---|---|
| Abbe Number (Vd) | 42.843119 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.25 — 1.55 µm |
$$n(\lambda) = \sqrt{2.40401 - 0.0084797\,\lambda^2 + 0.0179652\,\lambda^{-2} + 0.000355396\,\lambda^{-4} + 1.31037 \times 10^{-5}\,\lambda^{-6} + 1.19537 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 90.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.49815 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| LF6HT | Schott | 1.56732 | 42.847665 | |
| PBL26 | Ohara | 1.567322 | 42.831708 | |
| PBL26Y | Ohara | 1.567322 | 42.855569 | |
| S-TIL26 | Ohara | 1.567322 | 42.817076 | |
| H-QF56 | CDGM | 1.56732 | 42.810117 | |
| LF6 | Sumita | 1.56732 | 42.8 | |
| LF1 | Sumita | 1.57309 | 42.7 | |
| PBL21 | Ohara | 1.573092 | 42.576094 | |
| IRG7 | Generic IR | 1.564424 | 43.736647 | |
| LF8 | Schott | 1.564435 | 43.75028 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| E-FL6 | Hoya | 1.56732 | 42.84 | |
| FL1 | Hoya | 1.573091 | 42.586108 | |
| FL7 | Hoya | 1.57501 | 41.509668 | |
| FL57 | Hoya | 1.576163 | 41.39334 | |
| FL4 | Hoya | 1.578447 | 41.707529 | |
| FL3 | Hoya | 1.58215 | 42.028564 | |
| FEL4 | Hoya | 1.561379 | 45.226718 | |
| E-FL5 | Hoya | 1.58144 | 40.89 | |
| FL5 | Hoya | 1.581437 | 40.887611 | |
| FEL7 | Hoya | 1.54883 | 45.439785 |