
| Item | Index | ||
| Model | Top garde | First grade | Qualified product |
| Zinc oxide(as Zno)%,≥ | 99.7 | 99.5 | 99.4 |
| Metals (as Zn)%,≤ | No | No | 0.008 |
| Lead oxide(as Pb)%,≤ | 0.037 | 0.05 | 0.14 |
| Residue on sieve(45um)%,≤ | 0.10 | 0.15 | 0.20 |
| Volatile matter on 105℃%,≤ | 0.3 | 0.4 | 0.5 |
| Water soluble matter%,≤ | 0.10 | 0.10 | 0.15 |
| Oil absorption g/mg | 14 | 14 | 14 |
| Color (compared with the standard sample) | Similar | Slight yellow | Slight yellow |
| Reducing power(compare with the standard samples) ≥ | 100 | 95 | 90 |