UN 2466Potassium superoxide
Division 5.1
Oxidizing substances
Summary
UN 2466 is the UN number for potassium superoxide. It is classed in Division 5.1 (oxidizing substances) of Class 5 for transport. Packing group I. Emergency responders use ERG guide 143.
Emergency response
The Emergency Response Guidebook (ERG2024) guide for this number:
- Guide143Potassium superoxide
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 2466
- Name
- Potassium superoxide
- Hazard class
- Class 5: Oxidizers and organic peroxides
- Division
- 5.1: Oxidizing substances
- Packing group
- I
- What the class covers
- Substances which may cause or contribute to the combustion of other material, generally by yielding oxygen.
U.S. Hazardous Materials Table
The entry for this number in 49 CFR 172.101.
UN2466Potassium superoxide
Special provisions: A20, IB6, IP1
- Class
- 5.1
- Packing group
- I
- Labels
- 5.1
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 5
Class 5 covers substances that supply oxygen or otherwise intensify a fire. Division 5.1 is oxidizers such as ammonium nitrate and hydrogen peroxide; 5.2 is organic peroxides, which may also be thermally unstable.
Check the official sources
For emergency response, packaging and quantity limits, use these:
- CAMEO Chemicals: UN/NA 2466NOAA 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