LLF8 by Sumita
Obsolete
Very Rare
Environmentally Dangerous
LLF8 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.53256 and a Vd of 46.0. It has 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) | 1.53256 |
|---|---|
| Abbe Number (Vd) | 46.0 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.30424 - 0.00841078\,\lambda^2 + 0.0157556\,\lambda^{-2} + 8.32207 \times 10^{-5}\,\lambda^{-4} + 4.50331 \times 10^{-5}\,\lambda^{-6} - 2.6828 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| FF2 | Hoya | 1.532561 | 45.942878 | |
| FTM8 | Ohara | 1.532565 | 45.914102 | |
| LLF2 | Schott | 1.540719 | 47.171344 | |
| QF8 | CDGM | 1.540718 | 47.198243 | |
| FEL2 | Hoya | 1.540718 | 47.198247 | |
| E-FEL2 | Hoya | 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 |