| CSF-1 | CSF-2 | |
| SiO2 | 92.56 | 93.84 |
| Al2O3 | 0.55 | 0.55 |
| CaO | 0.18 | 0.14 |
| MgO | 0.23 | 0.12 |
| Na2O | 0.86 | 0.91 |
| K2O | 0.08 | 0.05 |
| Fe2O3 | 0.46 | 0.40 |
| MnO | <0.01 | <0.01 |
| TiO2 | 0.02 | 0.03 |
| ZnO | 3.82 | 2.8 |
| CuO | 0.08 | 0.08 |
| PbO | 0.03 | 0.02 |
| NiO | <0.01 | <0.01 |
| Cr2O3 | 0.01 | <0.01 |
| Heat losses, 1000˚C | 1.07 | 0.83 |