| Chemical analysis (standard) | ||
| % | Typical | Guaranteed |
| Al2O3 | 60,63 | min. 59,00 |
| SiO2 | 33,68 | – |
| Fe2O3 | 1,41 | max. 1,60 |
| TiO2 | 2,54 | – |
| MgO | 0,15 | – |
| CaO | 0,24 | – |
| K2O | 0,18 | – |
| Na2O | 0,06 | – |
| Physical properties | |||
| Typical | Guaranteed | ||
| Bulk density | 2,72 | 2,70 | g/cm3 |
| Water absorption | 0,70 | – | % |
| Apparent porosity | 42 | – | % |
| Mineralogical composition | |
| Main phase | mullite ≈ 85 % |
| Secondary phase | cristobalite ≈ 5 % |
| Other information |
| Calcined at temperatures between 1500 °C and 1550 °C. |