PBM27 by Ohara
Obsolete
Unknown
Environmentally Dangerous
PBM27 by Ohara is an obsolete optical glass. It transmits from 0.33 to 0.90 µm with an nd of 1.639799 and a Vd of 34.477127. It has medium thermal expansion (CTE of 8.8×10⁻⁶/K), good 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) | 1.639799 |
|---|---|
| Abbe Number (Vd) | 34.477127 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.3 — 2.4 µm |
$$n(\lambda) = \sqrt{2.61241 - 0.00873166\,\lambda^2 + 0.0248578\,\lambda^{-2} + 0.000887786\,\lambda^{-4} - 9.26403 \times 10^{-6}\,\lambda^{-6} + 4.50287 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.8 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.8 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.245 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | 2 |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-F51 | CDGM | 1.6398 | 34.46457 | |
| FD7 | Hoya | 1.639803 | 34.568909 | |
| E-FD7 | Hoya | 1.6398 | 34.57 | |
| SF7 | Sumita | 1.6398 | 34.6 | |
| C37-35 | Corning | 1.636493 | 35.322642 | |
| SF16 | Schott | 1.646112 | 34.049815 | |
| F6 | Hoya | 1.636356 | 35.340304 | |
| F6 | Schott | 1.636359 | 35.341176 | |
| F7 | CDGM | 1.636365 | 35.386204 | |
| F6 | Sumita | 1.63636 | 35.4 |
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| S-TIM27 | Ohara | 1.639799 | 34.466422 | |
| PBM6 | Ohara | 1.636358 | 35.376536 | |
| S-TIM6 | Ohara | 1.636358 | 35.391923 | |
| PBM22 | Ohara | 1.647689 | 33.802937 | |
| S-TIM22 | Ohara | 1.647689 | 33.792803 | |
| S-TIM1 | Ohara | 1.625882 | 35.699614 | |
| PBM1 | Ohara | 1.625882 | 35.700668 | |
| PBM11 | Ohara | 1.620955 | 35.880852 | |
| TIM11 | Ohara | 1.620955 | 35.880852 | |
| PBM2 | Ohara | 1.620041 | 36.256658 |