Hazmat UN Number Lookup

Search hazardous materials database, check safety specifications, and view Emergency Response guides.

🏷️ Primary Hazard Class Filter

UN2978

Radioactive material, uranium hexafluoride non fissile or fissile-excepted

Radioactive Materials

Class 7 (Primary)Class 6.1 (Subsidiary)Class 8 (Subsidiary)

CAS Registry7440-61-1 / 7440-29-1 (Uranium/Thorium)

Hazchem / EAC3N

ERG Guide Number174

49 CFR Placards & Labels

RadioactiveClass 7

⇩ SVG

Toxic (Poison)Class 6.1

⇩ SVG

CorrosiveClass 8

⇩ SVG

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)

—

Labels (col 6)

7, 6.1, 8

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

§173.423

Non-Bulk (col 8B)

§173.420, 427

Bulk (col 8C)

§173.420, 427

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

—

Cargo Aircraft Only (9B)

—

Vessel stowage (col 10)

Location (10A)

Other codes (10B)

40, 74, 95, 132, 151, 153

Special provisions (col 7 — §172.102)

—

Hazard Classification & Risks

Class 7 — Radioactive material. Activity concentration and total activity exceed the §173.403 limits (49 CFR §173.401).

Transport Regulations

Hazard class 7. Placard/label codes: 7, 6.1, 8. Packaging (49 CFR §173): exceptions §423, non-bulk §420, 427, bulk §420, 427. Vessel stowage: B (other: 40, 74, 95, 132, 151, 153). Classified per 49 CFR §172.101.

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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.

Regulatory Facts

Packing Group

—

Symbols (col 1)

—

Labels (col 6)

7, 6.1, 8

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

§173.423

Non-Bulk (col 8B)

§173.420, 427

Bulk (col 8C)

§173.420, 427

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

—

Cargo Aircraft Only (9B)

—

Vessel stowage (col 10)

Location (10A)

Other codes (10B)

40, 74, 95, 132, 151, 153

Special provisions (col 7 — §172.102)

—

Source & sourcing note

Emergency-response content is drawn from the 2024 Emergency Response Guidebook (ERG), a joint publication of PHMSA, Transport Canada, and Mexico’s SCT.