| 99.% | Black powder |
| Item | Specification | Results |
| Appearance | Blue-black crystal or powder | Conforms |
| Content | ≥99.0% | Conforms |
| Carbon Content | Carbon content:＞94.7%( By | |
| Purifying Methods | Sublimation in vacuum | |
| Solubility | Insoluble in most of Organic Solvents,soluble slightly in hot Benzene | |
| Melting Point | ＞300℃ | |
| Sublimation Point | 372~374℃ | |
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