Hazmat UN Number Lookup

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🏷️ Primary Hazard Class Filter

UN1956

Compressed gas, n.o.s

Gases

Class 2.2

CAS RegistryN/A

Hazchem / EAC2T

ERG Guide Number120

49 CFR Placards & Labels

Non-Flammable GasClass 2.2

⇩ 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)

2.2

PIH Zone

—

Packaging references (49 CFR §173.xxx)

Exceptions (col 8A)

§173.306, 307

Non-Bulk (col 8B)

§173.302, 305

Bulk (col 8C)

§173.314, 315

Aircraft quantity limits (col 9)

Passenger / Rail (9A)

75 kg

Cargo Aircraft Only (9B)

150 kg

Vessel stowage (col 10)

Location (10A)

Other codes (10B)

—

Special provisions (col 7 — §172.102)

—

Hazard Classification & Risks

Class 2.2 — Non-flammable, non-toxic gas (includes asphyxiant and oxidizing gases). Pressure ≥280 kPa at 20°C or refrigerated liquefied (49 CFR §173.115).

Transport Regulations

Hazard class 2.2. Placard/label codes: 2.2. Packaging (49 CFR §173): exceptions §306, 307, non-bulk §302, 305, bulk §314, 315. Quantity limits: passenger aircraft/rail 75 kg, cargo aircraft only 150 kg. 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.