BPG2 by Sumita
Obsolete
Very Rare
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) | 1.5592 |
|---|---|
| Abbe Number (Vd) | 53.9 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.39026 - 0.00873715\,\lambda^2 + 0.0145416\,\lambda^{-2} + 0.000168797\,\lambda^{-4} + 1.30068 \times 10^{-5}\,\lambda^{-6} - 7.18385 \times 10^{-8}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 7.4 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.72 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| N-KZFS2 | Schott | 1.55836 | 54.01 | |
| KZFSN2 | Schott | 1.558361 | 54.157173 | |
| ADF1 | Hoya | 1.564997 | 52.958253 | |
| B58-53 | Corning | 1.557511 | 52.533062 | |
| B48-53 | Corning | 1.547753 | 53.492251 | |
| BALF5 | Schott | 1.547391 | 53.629486 | |
| N-BALF5 | Schott | 1.54739 | 53.63 | |
| BAL5 | Ohara | 1.547393 | 53.550738 | |
| BAFL3 | Hoya | 1.571348 | 52.982526 | |
| BAL3 | Ohara | 1.571351 | 52.968158 |