| CSF-10 | CSF-20 | |
| SiO2 | 94.73 | 95.26 |
| Al2O3 | 0.24 | 0.26 |
| CaO | 0.31 | 0.22 |
| MgO | 0.11 | 0.08 |
| Na2O | 2.30 | 1.97 |
| K2O | 0.35 | 0.19 |
| Fe2O3 | 0.11 | 0.13 |
| MnO | 0.07 | 0.01 |
| TiO2 | <0.01 | 0.24 |
| ZnO | <0.01 | <0.01 |
| CuO | <0.01 | <0.01 |
| PbO | <0.01 | <0.01 |
| NiO | <0.01 | <0.01 |
| Cr2O3 | <0.01 | <0.01 |
| Heat losses, 1000˚C | 1.72 | 1.61 |