UN 1845Carbon dioxide, solid, also called Dry ice
Proper shipping name: Carbon dioxide, solid or Dry ice
Class 9
Miscellaneous dangerous goods
Summary
UN 1845 is the UN number for carbon dioxide, solid, also called Dry ice. It is classed in Class 9 (miscellaneous dangerous goods) for transport. Emergency responders use ERG guide 120.
Emergency response
The Emergency Response Guidebook (ERG2024) guide for this number:
- Guide120Carbon dioxide, solidDry ice
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 1845
- Name
- Carbon dioxide, solid, also called Dry ice
- Hazard class
- Class 9: Miscellaneous dangerous goods
- What the class covers
- Substances and articles which present a hazard during transport not covered by other classes, such as lithium batteries and environmentally hazardous substances.
U.S. Hazardous Materials Table
The entry for this number in 49 CFR 172.101.
UN1845Carbon dioxide, solid or Dry ice
- Regulated only when shipped by air
- Regulated only when shipped by water
- Class
- 9
- Packing group
- None
- Labels
- None
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 9
Class 9 covers dangerous goods that don't fit any other class, including lithium batteries, dry ice, environmentally hazardous substances, elevated-temperature materials and magnetized material.
Check the official sources
For emergency response, packaging and quantity limits, use these:
- CAMEO Chemicals: UN/NA 1845NOAA 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