PBM25 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) | 1.6727 |
|---|---|
| Abbe Number (Vd) | 32.101636 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.3 — 2.4 µm |
$$n(\lambda) = \sqrt{2.71076 - 0.00928892\,\lambda^2 + 0.0275423\,\lambda^{-2} + 0.00135126\,\lambda^{-4} - 5.45639 \times 10^{-5}\,\lambda^{-6} + 8.32611 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.5 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.5 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.818 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.07 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 2 |
| Alkali Resistance | — |
| Phosphate Resistance | 2 |
Similar Glasses (Other Manufacturers)
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| S-TIM25 | Ohara | 1.6727 | 32.099206 | |
| PBM39 | Ohara | 1.666799 | 33.046816 | |
| S-TIM39 | Ohara | 1.6668 | 33.054985 | |
| PBM28 | Ohara | 1.68893 | 31.082901 | |
| PBM28W | Ohara | 1.68893 | 31.082901 | |
| S-TIM28 | Ohara | 1.688931 | 31.07545 | |
| L-TIM28 | Ohara | 1.689479 | 31.023399 | |
| L-TIM28P | Ohara | 1.694529 | 30.655992 | |
| S-TIM22 | Ohara | 1.647689 | 33.792803 | |
| PBM22 | Ohara | 1.647689 | 33.802937 |