| CAS/UN/NA-Number | Name | Hazard Class |
|---|
UN 2330
CAS 1120-21-4 | Undecane | 3 |
| UN 3507 | Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, non-fissile or fissile-excepted | 6.1 |
| UN 1511 | Urea hydrogen peroxide | 5.1 |
UN 0220
CAS 124-47-0 | Urea nitrate, dry or wetted with less than 20 percent water, by mass | 1.1D |
UN 1357
CAS 124-47-0 | Urea nitrate, wetted with not less than 20 percent water, by mass | 4.1 |
| UN 3370 | Urea nitrate, wetted, with not less than 10 percent water by mass | 4.1 |
| Urea peroxide, see Urea hydrogen peroxide | |