UN 2846Pyrophoric solids, organic, n.o.s.
Division 4.2
Spontaneously combustible
Summary
UN 2846 is the UN number for pyrophoric solids, organic, n.o.s. It is classed in Division 4.2 (spontaneously combustible) of Class 4 for transport. Packing group I. Emergency responders use ERG guide 135.
Emergency response
The Emergency Response Guidebook (ERG2024) guide for this number:
- Guide135Pyrophoric solid, organic, n.o.s.
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 2846
- Name
- Pyrophoric solids, organic, n.o.s.
- Hazard class
- Class 4: Flammable solids
- Division
- 4.2: Spontaneously combustible
- Packing group
- I
- What the class covers
- Substances liable to spontaneous combustion.
U.S. Hazardous Materials Table
The entry for this number in 49 CFR 172.101.
UN2846Pyrophoric solids, organic, n.o.s
- Technical name required in parentheses
Special provisions: W31
- Class
- 4.2
- Packing group
- I
- Labels
- 4.2
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 4
Class 4 covers flammable solids and other substances that can catch fire. Division 4.1 is flammable solids and self-reactive substances, 4.2 is substances that can spontaneously combust in air, and 4.3 is substances that give off flammable gas when wet.
Check the official sources
For emergency response, packaging and quantity limits, use these:
- CAMEO Chemicals: UN/NA 2846NOAA 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