 Introduction:
Introduction: | Item no | J50 | J90 | J30 | 
| Appearance | White powder | White powder | White powder | 
| Purity ﹪ | ≥99.9% | ≥99.9% | ≥99.9% | 
| Loss on dry ﹪ | ≤0.5 | ≤0.3 | ≤0.3 | 
| Loss on burning ﹪ | ≤4 | ≤0.2 | ≤0.2 | 
| Average particle size nm | 50±10 | 90±10 | 30±10 | 
| Content of Pb in PbO ﹪ | ≤0.0001 | ≤0.0005 | ≤0.0001 | 
| Content of Mn in MnO﹪ | ≤0.0001 | ≤0.0001 | ≤0.0001 | 
| Content of Cu in CuO﹪ | ≤0.0002 | ≤0.0002 | ≤0.0002 |