| Sample | CuO | B2O3 | Na2O |
| mol% | |||
| Parent (Base) | 0 | 75 | 25 |
| Cu1 | 2.5 | 75 | 22.5 |
| Cu2 | 5 | -- | 20 |
| Cu3 | 7.5 | -- | 17.5 |
| Cu4 | 10 | -- | 15 |
| Cu5 | 15 | -- | 10 |
| Cu6 | 20 | -- | 5 |
| Cu7 | 22.5 | -- | 2.5 |
| Cu8 | 25 | -- | 0 |