Hazmat UN Number Lookup

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

🏷️ Primary Hazard Class Filter

UN1439

Ammonium dichromate

Oxidizers

Class 5.1PG II

CAS RegistryN/A

Hazchem / EAC1E

ERG Guide Number140

49 CFR Placards & Labels

OxidizerClass 5.1

⇩ 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)

5.1

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

§173.152

Non-Bulk (col 8B)

§173.212

Bulk (col 8C)

§173.242

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

5 kg

Cargo Aircraft Only (9B)

25 kg

Vessel stowage (col 10)

Location (10A)

Other codes (10B)

Special provisions (col 7 — §172.102)

IB8 IP2 IP4 T3 TP33

Hazard Classification & Risks

Class 5.1 — Oxidizer. Yields oxygen and may cause or intensify the combustion of other materials (49 CFR §173.127). Packing Group II — medium danger.

Transport Regulations

Hazard class 5.1, Packing Group II. Placard/label codes: 5.1. Special provisions: IB8, IP2, IP4, T3, TP33. Packaging (49 CFR §173): exceptions §152, non-bulk §212, bulk §242. Quantity limits: passenger aircraft/rail 5 kg, cargo aircraft only 25 kg. Vessel stowage: A (other: 52). 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.