UN 3104Organic peroxide type C, solid
Division 5.2
Organic peroxides
Summary
UN 3104 is the UN number for organic peroxide type C, solid. It is classed in Division 5.2 (organic peroxides) of Class 5 for transport. Emergency responders use ERG guide 146.
Emergency response
The Emergency Response Guidebook (ERG2024) guide for this number:
- Guide146Organic peroxide type C, solid
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 3104
- Name
- Organic peroxide type C, solid
- Hazard class
- Class 5: Oxidizers and organic peroxides
- Division
- 5.2: Organic peroxides
- What the class covers
- Organic compounds containing the bivalent -O-O- structure, which may be thermally unstable.
U.S. Hazardous Materials Table
The entry for this number in 49 CFR 172.101.
UN3104Organic peroxide type C, solid
- Technical name required in parentheses
- Class
- 5.2
- Packing group
- None
- Labels
- 5.2
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 3104NOAA 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