BSL21 by Ohara
Obsolete
Unknown
Environmentally Dangerous
BSL21 by Ohara is an obsolete optical glass. It transmits from 0.30 to 0.70 µm with an nd of 1.503779 and a Vd of 66.814545. It has low thermal expansion (CTE of 6.2×10⁻⁶/K), excellent 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) | 1.503779 |
|---|---|
| Abbe Number (Vd) | 66.814545 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.3 — 2.4 µm |
$$n(\lambda) = \sqrt{2.23473 - 0.00978567\,\lambda^2 + 0.00983676\,\lambda^{-2} + 0.000213984\,\lambda^{-4} - 1.45549 \times 10^{-5}\,\lambda^{-6} + 8.73937 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.189 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | 1 |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| PC1 | Hoya | 1.503779 | 66.88712 | |
| PK1 | Schott | 1.503781 | 66.921827 | |
| N-BK10 | Schott | 1.49782 | 66.95 | |
| BK10 | Schott | 1.497821 | 66.95447 | |
| BK10 | Sumita | 1.49782 | 67.0 | |
| H-K2 | CDGM | 1.50047 | 66.020774 | |
| BK4 | Sumita | 1.50048 | 66.0 | |
| BSC4 | Hoya | 1.50048 | 65.996466 | |
| BSC3 | Hoya | 1.498309 | 65.130542 | |
| BK3 | Sumita | 1.49831 | 65.1 |
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| BSL3 | Ohara | 1.498308 | 65.026785 | |
| BSL22 | Ohara | 1.518206 | 65.039654 | |
| BSL7Y | Ohara | 1.51633 | 64.243778 | |
| BSL7 | Ohara | 1.51633 | 64.150145 | |
| S-BSL7 | Ohara | 1.51633 | 64.142022 | |
| L-BSL7 | Ohara | 1.51633 | 64.065129 | |
| BSL1 | Ohara | 1.510091 | 63.635037 | |
| S-APL | Ohara | 1.517277 | 69.56319 | |
| S-APL1 | Ohara | 1.517277 | 69.563209 | |
| APL1 | Ohara | 1.517277 | 69.563209 |