| Technical specification | Special grade | ProductsFist grade | ProductsSecond grade | ProductsUp to standard |
| Whiteness ％≥ | 92 | 90 | 88 | 88 |
| Dust, mm2/g ≤ | 0.4 | 0.6 | 0.8 | 1.0 |
| CaCO3 ％≤ | 1.00 | 1.50 | 2.00 | 4.00 |
| Acid iron melted(taking Fe2O3) ≤ | 0.2 | 0.3 | 0.5 | 0.5 |
| PH | 7-8.5 | 8.5-9.5 | ||
| Moisture ％≤ | 0.5 | 0.5 | 0.5 | 0.5 |
| L.O.I.(800℃) ％≤ | 6.00 | 8.00 | 12.00 | 22.00 |
| Wear and tear(cooper net) mg ％≤ | 80.0 | 100.0 | — | |
| Oil-absorbed | 20.0—50.0 | |||
| Passing through(45µm) ％≥ | 98 | |||
Note: Production standard: GB15342-94.