Phonolite
Phonolite is volcanic effusion rock of a stable chemical analysis corresponding to non-phelinic syenite with phoids. It belongs to the group of phonolites. It is used as a fluxing agent in ceramic masses and glass batches where the contents colouring oxides is not decisive. Due to high contents of alkalis phonolite offers the possibility of cutting down the melting temperatures and reducing the firing time.
Chemical analysis
| SiO2 | 54 - 58% |
|---|---|
| Al2O3 | 20 - 23% |
| Fe2O3 | max. 2,5% |
| TiO2 | max. 0,3% |
| CaO | max. 1,3% |
| MgO | max. 0,2% |
| K2O | 3,5 - 6,5% |
| Na2O | 8,5 - 11% |
Analysis by fireproof microscope
| Start of shrinking | 850 °C |
|---|---|
| Start of sintering | 1080 °C |
| End of sintering | 1180 °C |
| Start of melting | 1320 °C |
| Start of dispersing | 1380 °C |
Packaging
- Ground, sorted in fractions 0 - 1,25 mm, 0 - 2 mm, 0 - 3 mm or 0 - 4 mm.
- Supplies of other grain size distribution can be arranged directly with the factory executives.
