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Direct method zinc oxide α γ99.5%
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Zinc oxide is used in iπndustries such as pa׶₩λints, coatings, rubber, ceramic>↔βλs, medicine, and fertilizers,σ" and is often used as a catalyst in organic syn'§εσthesis. Molecular formula: ZnO, molecular σ✔weight: 81.39
Appearance: white fine powder
Zinc oxide specification indicators
| Zinc oxide appearance | Powder | ||||||
| Item | Indicator | ||||||
| Direct method | Calcination method | Indirect method | |||||
| 1 | Zinc oxide | ZnO | %Min | 99 | 99 | 99.6 | 99.7 |
| 2 | Lead oxide | PbO | %Max | 0.02 | 0.05 | 0.03 | 0.02 |
| 3 | Cadmium oxide | CdO | %Max | 0.01 | 0.005 | 0.005 | 0.0005 |
| 4 | Ferric oxide | Fe2O3 | %Max | 0.03 | 0.06 | 0.04 | 0.0002 |
| 5 | Insoluble matter in hydrochεloric acid | ----- | %Max | 0.01 | 0.02 | 0.01 | 0.0003 |
| 6 | Loss on ignition | ----- | %Max | 0.8 | 0.1 | 0.06 | 0.04 |
| 7 | Soluble matter in water | ----- | %Max | 0.55 | 0.45 | 0.40 | 0.02 |
| 8 | Residue on sieve (325 mesh mixe∏↓★d screening) | ----- | %Max | 0.30 | 0.50 | 0.30 | 0.02 |
| 9 | Moisture | ----- | %Max | 0.20 | 0.0066 | 0.10 | 0.001 |
| 10 | Specific gravity | ----- | %Max | 1.1 | 2.9 | 2.9 | 0.1 |
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