BK1 by Schott
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) | 1.510091 |
|---|---|
| Abbe Number (Vd) | 63.464788 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.04251\,\lambda^2}{\lambda^2 - 0.00616569} + \frac{0.20838\,\lambda^2}{\lambda^2 - 0.0212153} + \frac{0.980148\,\lambda^2}{\lambda^2 - 109.061}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.7 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.8 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.87 \times 10^{-7} + 2(1.12 \times 10^{-8})\,\Delta T + 3(-1.44 \times 10^{-10})\,\Delta T^2 + \frac{4.92 \times 10^{-7} + 2(-1.45 \times 10^{-10})\,\Delta T}{\lambda - 0.147}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.46 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
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Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| BSC1 | Hoya | 1.510091 | 63.435118 | |
| BK1 | Sumita | 1.51009 | 63.4 | |
| B10-63 | Corning | 1.509992 | 63.551713 | |
| H-K5 | CDGM | 1.510072 | 63.364525 | |
| BSL1 | Ohara | 1.510091 | 63.635037 | |
| K-PBK40(M) | Sumita | 1.51497 | 63.3 | |
| D-K9-25 | CDGM | 1.51577 | 63.989637 | |
| D-K9GT-25 | CDGM | 1.51577 | 63.989637 | |
| D-K59-25 | CDGM | 1.51698 | 63.4085 | |
| S-BSL7R | Ohara | 1.51633 | 63.881689 |
Similar Glasses (Schott)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| AF32ECO | Schott | 1.511531 | 62.574031 | |
| P-BK7 | Schott | 1.5164 | 64.06 | |
| BK7HT | Schott | 1.51633 | 64.14348 | |
| BK7 | Schott | 1.5168 | 64.167336 | |
| N-BK7HTSultra | Schott | 1.5168 | 64.17 | |
| N-BK7 | Schott | 1.5168 | 64.17 | |
| N-BK7HT | Schott | 1.5168 | 64.17 | |
| N-BK7HTi | Schott | 1.5168 | 64.17 | |
| UBK7 | Schott | 1.516801 | 64.289727 | |
| BK7G18 | Schott | 1.51975 | 63.58 |