Prilled urea is a particular kind of nitrogen-rich ad blue composed of spherical, solid pellets. It has a high nitrogen content, around 46%, making it the most well-known solid ad blue. Usually, the diameter of the prills ranges from 1 to 2.8 millimeters.
| No | Property | Unit | Test Method | Spec. Value |
| 1 | N2 content | Wt% | BS DIN EN 15478 | Min 46 |
| 2 | Biuret content | Wt% | BS DIN EN 15479 | Max 1.0 |
| 3 | Moisture | Wt% | ISO 760 | Max 0.3 |
| 4 | Particle size(1-2.83mm) | % | ISO 8397 | Min 90 |
