Hazmat UN Number Lookup

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

🏷️ Primary Hazard Class Filter

UN2672

Ammonia solution, relative density between 0.880 and 0.957 at 15 degrees C in water, with more than 10 percent but not more than 35 percent ammonia

Corrosives

Class 8PG III

CAS Registry7664-41-7

Hazchem / EAC2X

ERG Guide Number154

49 CFR Placards & Labels

CorrosiveClass 8

⇩ SVG

Reportable Quantity — 100 lb (45.4 kg)

Any release meeting or exceeding this amount must be reported to the National Response Center at 1-800-424-8802 under 40 CFR 302.6 and 49 CFR 171.15.

Marine Pollutant

Marine-pollutant mark (§172.322) required for bulk packages by vessel; IMDG segregation and stowage rules apply.

Regulatory Facts

Packing Group

III

Symbols (col 1)

—

Labels (col 6)

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

§173.154

Non-Bulk (col 8B)

§173.203

Bulk (col 8C)

§173.241

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

5 L

Cargo Aircraft Only (9B)

60 L

Vessel stowage (col 10)

Location (10A)

Other codes (10B)

40, 52, 85

Special provisions (col 7 — §172.102)

336 IB3 IP8 T7 TP2

Hazard Classification & Risks

Class 8 — Corrosive. Causes full-thickness skin destruction or severely corrodes steel/aluminum (49 CFR §173.136). Packing Group III — minor danger.

Transport Regulations

Hazard class 8, Packing Group III. Placard/label codes: 8. Special provisions: 336, IB3, IP8, T7, TP2. Packaging (49 CFR §173): exceptions §154, non-bulk §203, bulk §241. Quantity limits: passenger aircraft/rail 5 L, cargo aircraft only 60 L. Vessel stowage: A (other: 40, 52, 85). 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.