S-TIL26 by Ohara
Standard
Rare
Environmentally Friendly
S-TIL26 by Ohara is a standard optical glass with a rare melt frequency. It transmits from 0.35 to 2.40 µm with an nd of 1.567322 and a Vd of 42.817076. It has medium thermal expansion (CTE of 7.9×10⁻⁶/K), excellent chemical resistance, and low relative cost.
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) | 1.567322 |
|---|---|
| Abbe Number (Vd) | 42.817076 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.365015 — 2.32542 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.31066\,\lambda^2}{\lambda^2 - 0.00968898} + \frac{0.0941903\,\lambda^2}{\lambda^2 - 0.0527763} + \frac{1.23293\,\lambda^2}{\lambda^2 - 133.296}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.9 |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[8.85 \times 10^{-7} + 2(1.27 \times 10^{-8})\,\Delta T + 3(-3.61 \times 10^{-11})\,\Delta T^2 + \frac{5.87 \times 10^{-7} + 2(6.12 \times 10^{-10})\,\Delta T}{\lambda - 0.27}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | 1 |
Notes
Recommended
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-QF56 | CDGM | 1.56732 | 42.810117 | |
| LF6 | Sumita | 1.56732 | 42.8 | |
| E-FL6 | Hoya | 1.56732 | 42.84 | |
| FL6 | Hoya | 1.567324 | 42.843119 | |
| LF6HT | Schott | 1.56732 | 42.847665 | |
| LF1 | Sumita | 1.57309 | 42.7 | |
| FL1 | Hoya | 1.573091 | 42.586108 | |
| IRG7 | Generic IR | 1.564424 | 43.736647 | |
| LF8 | Schott | 1.564435 | 43.75028 | |
| FL7 | Hoya | 1.57501 | 41.509668 |
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| PBL26 | Ohara | 1.567322 | 42.831708 | |
| PBL26Y | Ohara | 1.567322 | 42.855569 | |
| PBL21 | Ohara | 1.573092 | 42.576094 | |
| S-TIL27 | Ohara | 1.575006 | 41.505207 | |
| PBL27 | Ohara | 1.575006 | 41.491052 | |
| PBL35Y | Ohara | 1.581591 | 40.855991 | |
| PBL25Y | Ohara | 1.581439 | 40.768047 | |
| PBL25 | Ohara | 1.581439 | 40.753351 | |
| S-TIL25 | Ohara | 1.581439 | 40.747566 | |
| PBL22 | Ohara | 1.589206 | 41.07921 |