Hazmat UN Number Lookup

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🏷️ Primary Hazard Class Filter

UN2321

Trichlorobenzenes, liquid

Toxic Substances

Class 6.1PG III

CAS Registry71-43-2

Hazchem / EAC2X

ERG Guide Number153

49 CFR Placards & Labels

Toxic (Poison)Class 6.1

⇩ SVG

Reportable Quantity — 10 lb (4.54 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.

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)

6.1

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

§173.153

Non-Bulk (col 8B)

§173.203

Bulk (col 8C)

§173.241

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

60 L

Cargo Aircraft Only (9B)

220 L

Vessel stowage (col 10)

Location (10A)

Other codes (10B)

—

Special provisions (col 7 — §172.102)

IB3 T4 TP1

Hazard Classification & Risks

Class 6.1 — Toxic (poison). Liable to cause death or serious injury if swallowed, inhaled or absorbed through skin (49 CFR §173.132). Packing Group III — minor danger.

Transport Regulations

Hazard class 6.1, Packing Group III. Placard/label codes: 6.1. Special provisions: IB3, T4, TP1. Packaging (49 CFR §173): exceptions §153, non-bulk §203, bulk §241. Quantity limits: passenger aircraft/rail 60 L, cargo aircraft only 220 L. Vessel stowage: A. 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.

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