Hazmat UN Number Lookup

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🏷️ Primary Hazard Class Filter

UN1041

Ethylene oxide and carbon dioxide mixtures with more than 9 percent but not more than 87 percent ethylene oxide

Gases

Class 2.1

CAS Registry124-38-9

Hazchem / EAC2YE

ERG Guide Number115

49 CFR Placards & Labels

Flammable GasClass 2.1

⇩ 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.

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

Regulatory Facts

Packing Group

—

Symbols (col 1)

—

Labels (col 6)

2.1

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

§173.306

Non-Bulk (col 8B)

§173.304

Bulk (col 8C)

§173.314, 315

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

Forbidden

Cargo Aircraft Only (9B)

25 kg

Vessel stowage (col 10)

Location (10A)

Other codes (10B)

Special provisions (col 7 — §172.102)

T50

Hazard Classification & Risks

Class 2.1 — Flammable gas. Ignitable at 101.3 kPa in a mixture of ≤13% with air, or with a flammable range ≥12% (49 CFR §173.115).

Transport Regulations

Hazard class 2.1. Placard/label codes: 2.1. Special provisions: T50. Packaging (49 CFR §173): exceptions §306, non-bulk §304, bulk §314, 315. Quantity limits: passenger aircraft/rail Forbidden, cargo aircraft only 25 kg. Vessel stowage: B (other: 40). 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.