| Appearance | conforms |
| Identity | conforms |
| Assay (Nitrogen, calc. on anhydrous substance) | 11.5 - 12.8 % |
| Appearance of solution (5 %; water) | conforms |
| pH-value (5 %; water) | 3.0 - 5.0 |
| Heavy metals (as Pb) | ≤ 0.0010 % |
| Viscosity (calc. as k-value) | 22.5 - 27.0 |
| Aldehydes (calc. on CH₃CHO) | ≤ 0.0500 % |
| Peroxide (calc. as H₂O₂) | ≤ 0.0400 % |
| Formic acid | ≤ 0.5 % |
| related substances (Hydrazine) | ≤ 1 ppm |
| related substances (Vinyl pyrrolidone) | ≤ 10 ppm |
| related substances (2-Pyrrolidone*) | ≤ 3.0 % |
| Water | ≤ 5.0 % |
| Sulfated ash (600 °C) | ≤ 0.1 % |
* Parameter tested by qualified laboratory
Residues of metal catalysts or metal reagents acc. to EMEA/CHMP/SWP/4446/2000 are not likely to be present. |
| Corresponds to Ph Eur , BP |
