UN 3331Radioactive material, transported under special arrangements, fissile
Proper shipping name: Radioactive material, transported under special arrangement, fissile
Class 7
Radioactive material
Summary
UN 3331 is the UN number for radioactive material, transported under special arrangements, fissile. It is classed in Class 7 (radioactive material) for transport. Emergency responders use ERG guide 165.
Emergency response
The Emergency Response Guidebook (ERG2024) guide for this number:
- Guide165Radioactive material, transported under special arrangement, fissile
From the 2024 Emergency Response Guidebook (ERG2024), published by U.S. Department of Transportation, PHMSA. Read the full guide in the ERG or on CAMEO Chemicals.
Identification
- UN number
- UN 3331
- Name
- Radioactive material, transported under special arrangements, fissile
- Hazard class
- Class 7: Radioactive material
- What the class covers
- Material containing radionuclides above set activity limits.
U.S. Hazardous Materials Table
The entry for this number in 49 CFR 172.101.
UN3331Radioactive material, transported under special arrangement, fissile
Special provisions: A56, 139
- Class
- 7
- Packing group
- None
- Labels
- 7
From the eCFR edition of 49 CFR 172.101 dated 2026-10-05 (section last amended 2026-09-08). The eCFR is an editorial compilation, not the official legal edition. Read the current table.
About Class 7
Class 7 covers radioactive material, from medical isotopes to nuclear fuel. Packages are labelled by radiation level at the surface and the type of packaging used.
Check the official sources
For emergency response, packaging and quantity limits, use these:
- CAMEO Chemicals: UN/NA 3331NOAA datasheets with the ERG response guide and isolation distances
- Emergency Response Guidebook (ERG)PHMSA's guide for first responders, free as a PDF or app
- 49 CFR 172.101 Hazardous Materials TableThe legal U.S. entry: proper shipping name, packing group, labels and special provisions