FTM8 by Ohara
Obsolete
Unknown
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) | 1.532565 |
|---|---|
| Abbe Number (Vd) | 45.914102 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.3 — 2.4 µm |
$$n(\lambda) = \sqrt{2.30634 - 0.00929943\,\lambda^2 + 0.0141485\,\lambda^{-2} + 0.000619449\,\lambda^{-4} - 3.54213 \times 10^{-5}\,\lambda^{-6} + 4.3561 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.5 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.7 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.683 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.53 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | 1 |
Similar Glasses (Other Manufacturers)
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| S-TIL2 | Ohara | 1.54072 | 47.227127 | |
| PBL2 | Ohara | 1.54072 | 47.23368 | |
| S-TIL1 | Ohara | 1.548141 | 45.784277 | |
| PBL1 | Ohara | 1.548141 | 45.781144 | |
| PBL1Y | Ohara | 1.548141 | 45.733282 | |
| PBL7 | Ohara | 1.548689 | 45.555746 | |
| S-TIL6 | Ohara | 1.531717 | 48.840718 | |
| PBL6 | Ohara | 1.531717 | 48.904553 | |
| PBL6Y | Ohara | 1.531717 | 48.956017 | |
| PBL26Y | Ohara | 1.567322 | 42.855569 |