K-BPG2 by Sumita
Standard
Very Common
Environmentally Friendly
K-BPG2 by Sumita is a standard optical glass with a very common melt frequency. It transmits from 0.33 to 2.00 µm with an nd of 1.5592 and a Vd of 53.9. It has low thermal expansion (CTE of 6.0×10⁻⁶/K) and excellent chemical resistance.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.0 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.4 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.45 \times 10^{-6} + 2(1.89 \times 10^{-8})\,\Delta T + 3(-2.11 \times 10^{-10})\,\Delta T^2 + \frac{5.53 \times 10^{-7} + 2(8.99 \times 10^{-10})\,\Delta T}{\lambda - 0.207}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| 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 |