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By certification 
Use:mainly used for the manufacturing of high requirement of rubber products or rubber chemicals.
Features:Small single particle size, larger than surface area, strong dispersion capacity, with strong activity .
| Item | Indicator | |||
| Model | Grade A | Grade B | Grade C | Grade D |
| Zinc oxide (ZnO) %≥ | 98 | 97 | 96 | 95 |
| Moisture %≤ | 0.7 | 0.7 | 0.7 | 0.7 |
| Water soluble %≤ | 0.5 | 0.6 | 0.7 | 0.8 |
| Loss on ignition %≤ | 1–3 | 1–4 | 1–4 | 1–4 |
| Hydrochloric acid insuluble substance %≤ | 0.02 | 0.03 | 0.05 | 0.05 |
| Lead oxide(Pb) %≤ | 0.01 | 0.01 | 0.05 | 0.05 |
| Manganese oxide（Mn） %≤ | 0.001 | 0.001 | 0.002 | 0.002 |
| Copper oxide(Cu) %≤ | 0.001 | 0.001 | 0.002 | 0.002 |
| Fineness（45um Sieve residue ） %≤ | 0.1 | 0.2 | 0.3 | 0.4 |
| Specific surface ㎡/g %≤ | 45 | 45 | 35 | 35 |
| Accumulated density: g/m %≥ | 0.35 | 0.35 | 0.4 | 0.4 |
