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| parameter | value range |
|---|---|
| urea proportion (w/%) | 32.1–33.1 |
| undissolved substance (mg/kg) | ≤20 |
| alkalinity (calculated by NH3) (w/%) | ≤0.2 |
| biuret (w/%) | ≤0.3 |
| density, 20 °C (g/mL) | 1.087–1.092 |
| refractive index, 20 °C | 1.3817–1.3840 |
