Open Access
Table 1
Nominal chemical composition of S-BSL7 compared to N-BK7®.
| Component | Proportion of S-BSL7 (%) (Ohara GmbH) | Proportion of N-BK7® (%) (Schott AG) |
|---|---|---|
| SiO2 | 60–70 | 60–70 |
| B2O3 | 10–20 | 10–20 |
| BaO | 0–2 | 1–10 |
| ZnO | 0–2 | – |
| Sb2O3 | 0–2 | <1 |
| TiO2 | 0–2 | <1 |
| Na2O | – | 10–20 |
| K2O | – | 1–10 |
| CaO | – | <1 |
| Cl2 | – | <1 |
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