PBH4W 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) | 1.755199 |
|---|---|
| Abbe Number (Vd) | 27.512146 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.3 — 2.4 µm |
$$n(\lambda) = \sqrt{2.96138 - 0.00982623\,\lambda^2 + 0.0367796\,\lambda^{-2} + 0.00207129\,\lambda^{-4} - 9.33487 \times 10^{-5}\,\lambda^{-6} + 1.54914 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.9 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.208 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.78 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | 1 |
Notes
Improved Transmittance
Similar Glasses (Other Manufacturers)
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| PBH4 | Ohara | 1.755199 | 27.512146 | |
| S-TIH4 | Ohara | 1.755199 | 27.512089 | |
| PBH25W | Ohara | 1.761797 | 27.107726 | |
| PBH25 | Ohara | 1.761797 | 27.107724 | |
| PBH14 | Ohara | 1.761819 | 26.553651 | |
| PBH14W | Ohara | 1.761819 | 26.553651 | |
| TIH14 | Ohara | 1.761821 | 26.517966 | |
| S-TIH14 | Ohara | 1.761821 | 26.517885 | |
| S-TIH13 | Ohara | 1.740769 | 27.789359 | |
| PBH13W | Ohara | 1.740769 | 27.793228 |