
| Item No | Index | Measured Value |
| Appearance | White powder | Compliance index |
| Specific surface area of nitrogen adsorption m2/g | 150±10 | 150 |
| PH | 3.7-4.5 | 4.19 |
| Sio2- content | >99.8 | 99.9% |
| Volatile matter % at 105 oC | ≤3.0 | 0.82 |
| Tamping density g/dm3 | 30-60 | 31 |
| Sieve residue(45μm) mg/kg | ≤250 | 19.93 |
| Item No | Index | Measured Value |
| Appearance | White powder | Compliance index |
| Specific surface area of nitrogen adsorption m2/g | 200±10 | 200 |
| Sio2- content | >99.8 | 99.9% |
| PH | 3.7-4.5 | 4.19 |
| Volatile matter % at 105 oC | ≤3.0 | 0.82 |
| Tamping density g/dm3 | 30-60 | 31 |
| Sieve residue(45μm) mg/kg | ≤250 | 19.93 |