| White powder | 99.0% |
| Item | Specification | Results |
| Appearance | White crystal powder | White crystal powder |
| Assay | ≥99.0% | 99.7% |
| Boat Form | ≥98.0% | 99.5% |
| Chair Form | ≤2.0% | 0.2% |
| 1,2,4,5-Benzenetetracarboxylic anhydride | ≤0.20% | 0.0% |
| Melting Point | 285-295℃ | 289℃ |
| Conclusion | Qualified | |
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