Chemical DescriptionPolyvinylpyrrolidone (abbr. PVP)CAS No. 9003-39-8INCI Name PVPMolecular Formula (C6H9NO)nCharacteristics--A white to yellowish white , hygroscopic powder;--Freely soluble in water and a variety of organic solvents;Specification Ph Eur ,USP/NF,BP,JPNoTestsK15K17K25K30K901Identifi......
No | Tests | K15 | K17 | K25 | K30 | K90 |
| 1 | Identification, A B C D E | Complies | ||||
| 2 | Appearance of solution | Clear, ≤B6,BY6 or R6 | ||||
| 3 | PH(in 5% solution) | 3-5 | 3-5 | 3-5 | 3-5 | 4-7 |
| 4 | Viscosity, as K-value | 13-17 | 14.5-19.5 | 22.5-27 | 27-32.4 | 81-97 |
| 5 | Aldehyde, ppm | ≤500 | ≤500 | ≤500 | ≤500 | ≤500 |
| 6 | Peroxides (as H2O2), ppm | ≤400 | ≤400 | ≤400 | ≤400 | ≤400 |
| 7 | Formic acid,% | ≤0.5 | ≤0.5 | ≤0.5 | ≤0.5 | ≤0.5 |
| 8 | Hydrazine, ppm | ≤1 | ≤1 | ≤1 | ≤1 | ≤1 |
| 9 | Impurity A (VP),ppm | ≤10 | ≤10 | ≤10 | ≤10 | ≤10 |
| 10 | Impurity B (2-pyrrolidone ),% | ≤3.0 | ≤3.0 | ≤3.0 | ≤3.0 | ≤3.0 |
| 11 | Heavy metals, ppm | ≤10 | ≤10 | ≤10 | ≤10 | ≤10 |
| 12 | Water, % | ≤5.0 | ≤5.0 | ≤5.0 | ≤5.0 | ≤5.0 |
| 13 | Sulphated ash,% | ≤0.1 | ≤0.1 | ≤0.1 | ≤0.1 | ≤0.1 |
| 14 | Assay, as Nitrogen content,% | 11.5-12.8 | 11.5-12.8 | 11.5-12.8 | 11.5-12.8 | 11.5-12.8 |

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