Complaint
| ITEM | UNIT | INDEX |
| Specific surface area (BET) | m2/g | 200 ± 25 |
| PH-value(4% ) | 3.7-4.3 | |
| Loss on drying (2 hours at 105°C) | Wt% | ≤ 1.5 |
| Loss on ignition (2 hours at 1000°C, based on material dried for 2 hours at 105°C) | Wt% | ≤ 2.0 |
| 325 Sieve residue (%) | % | ≤ 0.02 |
| Silica content (based on ignited material) | Wt% | ≥ 99.8 |
| Tamping density (Compressing type) | g/L | >100 |
