Hazmat UN Number Lookup
Search hazardous materials database, check safety specifications, and view Emergency Response guides.
🏷️ Primary Hazard Class Filter
UN1845
Carbon dioxide, solid or Dry ice
Miscellaneous Dangerous Goods
Class 9 (Primary)Class None (Subsidiary)
CAS Registry124-38-9
Hazchem / EAC2Z
ERG Guide Number171
49 CFR Placards & Labels
Not listed as a Reportable Quantity (RQ) hazardous substance under §172.101 Appendix A.
Not listed as a Marine Pollutant under §172.101 Appendix B.
Regulatory Facts
Packing Group
—
Symbols (col 1)
A W
Labels (col 6)
None
PIH Zone
—
Packaging references (49 CFR §173.xxx)
Exceptions (col 8A)
§173.217
Non-Bulk (col 8B)
§173.217
Bulk (col 8C)
§173.240
Aircraft quantity limits (col 9)
Passenger / Rail (9A)
200 kg
Cargo Aircraft Only (9B)
200 kg
Vessel stowage (col 10)
Location (10A)
C
Other codes (10B)
40
Special provisions (col 7 — §172.102)
—Hazard Classification & Risks
Class 9 — Miscellaneous dangerous goods that present a transport hazard not covered by other classes (e.g. elevated-temperature, environmentally hazardous, lithium batteries) (49 CFR §173.140).
Transport Regulations
Hazard class 9. Placard/label codes: None. Packaging (49 CFR §173): exceptions §217, non-bulk §217, bulk §240. Quantity limits: passenger aircraft/rail 200 kg, cargo aircraft only 200 kg. Vessel stowage: C (other: 40). Classified per 49 CFR §172.101.
Shortcuts:
p Printd SVGc Copy Names Copy Spilla Copy First-Aid
Source & sourcing note
Regulatory data mirrors the U.S. 49 CFR §172.101 Hazardous Materials Table and companion columns (packaging, quantity limits, vessel stowage, special provisions) as published by the U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA).
Emergency-response content is drawn from the 2024 Emergency Response Guidebook (ERG), a joint publication of PHMSA, Transport Canada, and Mexico’s SCT.
The U.S. edition of the ERG and all U.S. federal regulations are public-domain works under 17 U.S.C. §105. Descriptions on this page are plain-English paraphrases; for any compliance decision, consult the authoritative text on eCFR Title 49 and the ERG at PHMSA.dot.gov. “ERG™” is attributed to PHMSA / Transport Canada / SCT and used nominatively.