| References of specimens | F1 | F2 | F3 | F4 | |
| Raw material composition (wt%) | Clay (NONG) | 50 | 55 | 60 | 65 |
| Pegmatite (PEG) | 25 | 25 | 20 | 20 | |
| Sand (SAB) | 25 | 20 | 20 | 15 | |
| Water content (wt%) | 50 | 55 | 60 | 65 | |