Hazmat UN Number Lookup

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

🏷️ Primary Hazard Class Filter

UN1826

Nitrating acid mixtures, spent with more than 50 percent nitric acid

Corrosives

Class 8 (Primary)Class 5.1 (Subsidiary)PG I

CAS Registry7697-37-2

Hazchem / EAC2X

ERG Guide Number157

49 CFR Placards & Labels

CorrosiveClass 8

⇩ SVG

OxidizerClass 5.1

⇩ SVG

Reportable Quantity — 1,000 lb (454 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.

Source: 40 CFR §302.4 CERCLA list, matched by CAS. DOT §172.101 Appendix A lists the same substance under a different chemical name; RQ value is identical by regulatory design.

Not listed as a Marine Pollutant under §172.101 Appendix B.

Regulatory Facts

Packing Group

Symbols (col 1)

—

Labels (col 6)

8, 5.1

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

None

Non-Bulk (col 8B)

§173.158

Bulk (col 8C)

§173.243

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

Forbidden

Cargo Aircraft Only (9B)

2.5 L

Vessel stowage (col 10)

Location (10A)

Other codes (10B)

40, 53, 58, 66

Special provisions (col 7 — §172.102)

A7 T10 TP2 TP13

Hazard Classification & Risks

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

Transport Regulations

Hazard class 8, Packing Group II. Placard/label codes: 8. Special provisions: A7, B2, IB2, T8, TP2. Packaging (49 CFR §173): exceptions §154, non-bulk §158, bulk §242. Quantity limits: passenger aircraft/rail Forbidden, cargo aircraft only 30 L. Vessel stowage: D (other: 40, 53, 58). 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.