CAS number： 9003-39-8
Molecular formula： (C6H9NO)n
molecular weight： 111.143
Chemical structure：
| Product name | PVP K90 | |
| Shelf life | Two years | |
| Inspection Standard | USP32 | |
| Items | Specifications | Results |
| PH Value（5% aqueous solution） | 4.0-7.0 | 5.7 |
| Water | ≤5.0% | 3.6% |
| Heavy Metals（as Lead） | ≤10PPM | <10PPM |
| Acetaldehyde | ≤0.05% | <0.05% |
| Hydrazine | ≤1.0PPM | <1.0PPM |
| N-Vinylpynrrolidinone | ≤10PPM | <10PPM |
| K-Value | 81-96 | 93.5 |
| Nitrogen content | 11.5-12.8% | 12.1% |
| Residue on ignition | ≤0.1% | 0.05 |
| Peroxide | ≤400PPM | <400PPM |
| Conclusion | It conforms to USP32. | |
