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Hazard class 2.2

Class 2.2: Non-flammable, non-poisonous gas

Compressed gases that aren't flammable or toxic but can still be dangerous under pressure — for example nitrogen and compressed air. Below is every Class 2.2 entry in 49 CFR §172.101 that has a UN/NA number — 83 entries.

IDProper shipping nameClassPG
UN1002Air, compressed2.2—
UN1003Air, refrigerated liquid, (cryogenic liquid)2.2—
UN1003Air, refrigerated liquid, (cryogenic liquid) non-pressurized2.2—
UN1005Ammonia, anhydrous2.2—
UN1006Argon, compressed2.2—
UN1009Bromotrifluoromethane or Refrigerant gas, R 13B1.2.2—
UN1013Carbon dioxide2.2—
UN1018Chlorodifluoromethane or Refrigerant gas R 222.2—
UN1020Chloropentafluoroethane or Refrigerant gas R 1152.2—
UN10211-Chloro-1,2,2,2-tetrafluoroethaneor Refrigerant gas R 1242.2—
UN1022Chlorotrifluoromethane or Refrigerant gas R 132.2—
UN1028Dichlorodifluoromethane or Refrigerant gas R 122.2—
UN1029Dichlorofluoromethane or Refrigerant gas R212.2—
UN1043Fertilizer ammoniating solution with free ammonia2.2—
UN1044Fire extinguishers containing compressed or liquefied gas2.2—
UN1046Helium, compressed2.2—
UN1056Krypton, compressed2.2—
UN1058Liquefied gases, non-flammable charged with nitrogen, carbon dioxide or air2.2—
UN1065Neon, compressed2.2—
UN1066Nitrogen, compressed2.2—
UN1070Nitrous oxide2.2—
UN1072Oxygen, compressed2.2—
UN1073Oxygen, refrigerated liquid (cryogenic liquid)2.2—
UN1078Refrigerant gases, n.o.s.2.2—
UN1080Sulfur hexafluoride2.2—
UN1858Hexafluoropropylene compressed or Refrigerant gas R 12162.2—
UN1913Neon, refrigerated liquid (cryogenic liquid)2.2—
UN1950Aerosols, corrosive, Packing Group II or III, (each not exceeding 1 L capacity)2.2—
UN1950Aerosols, non-flammable, (each not exceeding 1 L capacity)2.2—
UN1950Aerosols, poison, Packing Group III (each not exceeding 1 L capacity)2.2—
UN1951Argon, refrigerated liquid (cryogenic liquid)2.2—
UN1952Ethylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxide2.2—
UN1956Compressed gas, n.o.s2.2—
UN19581,2-Dichloro-1,1,2,2- tetrafluoroethane or Refrigerant gas R 1142.2—
UN1963Helium, refrigerated liquid (cryogenic liquid)2.2—
UN1968Insecticide gases, n.o.s.2.2—
UN1970Krypton, refrigerated liquid (cryogenic liquid)2.2—
UN1973Chlorodifluoromethane and chloropentafluoroethane mixture or Refrigerant gas R 502 with fixed boiling point, with approximately 49 percent chlorodifluoromethane2.2—
UN1974Chlorodifluorobromomethane or Refrigerant gas R 12B12.2—
UN1976Octafluorocyclobutane, or Refrigerant gas RC 3182.2—
UN1977Nitrogen, refrigerated liquid cryogenic liquid2.2—
UN1982Tetrafluoromethane or Refrigerant gas R 142.2—
UN19831-Chloro-2,2,2-trifluoroethane or Refrigerant gas R 133a2.2—
UN1984Trifluoromethane or Refrigerant gas R 232.2—
UN2036Xenon, compressed2.2—
UN2037Receptacles, small, containing gas or gas cartridges (non-flammable) without release device, not refillable and not exceeding 1 L capacity2.2—
UN2037Receptacles, small, containing gas or gas cartridges (oxidizing), without release device, not refillable and not exceeding 1 L capacity2.2—
UN2073Ammonia solution, relative density less than 0.880 at 15 degrees C in water, with more than 35 percent but not more than 50 percent ammonia2.2—
UN2187Carbon dioxide, refrigerated liquid2.2—
UN2193Hexafluoroethane, or Refrigerant gas R 1162.2—
UN2201Nitrous oxide, refrigerated liquid2.2—
UN2422Octafluorobut-2-ene or Refrigerant gas R 13182.2—
UN2424Octafluoropropane or Refrigerant gas R 2182.2—
UN2451Nitrogen trifluoride2.2—
UN2591Xenon, refrigerated liquid (cryogenic liquids)2.2—
UN2599Chlorotrifluoromethane and trifluoromethane azeotropic mixture or Refrigerant gas R 503 with approximately 60 percent chlorotrifluoromethane2.2—
UN2602Dichlorodifluoromethane and difluoroethane azeotropic mixture or Refrigerant gas R 500 with approximately 74 percent dichlorodifluoromethane2.2—
UN2857Refrigerating machines, containing non-flammable, non-toxic gases, or ammonia solutions (UN2672)2.2—
UN3070Ethylene oxide and dichlorodifluoromethane mixture, with not more than 12.5 percent ethylene oxide2.2—
UN3136Trifluoromethane, refrigerated liquid2.2—
UN3156Compressed gas, oxidizing, n.o.s.2.2—
UN3157Liquefied gas, oxidizing, n.o.s.2.2—
UN3158Gas, refrigerated liquid, n.o.s. (cryogenic liquid)2.2—
UN31591,1,1,2-Tetrafluoroethane or Refrigerant gas R 134a2.2—
UN3163Liquefied gas, n.o.s.2.2—
UN3164Articles, pressurized pneumatic or hydraulic containing non-flammable gas2.2—
UN3220Pentafluoroethane or Refrigerant gas R 1252.2—
UN3296Heptafluoropropane or Refrigerant gas R 2272.2—
UN3297Ethylene oxide and chlorotetrafluoroethane mixture with not more than 8.8 percent ethylene oxide2.2—
UN3298Ethylene oxide and pentafluoroethane mixture with not more than 7.9 percent ethylene oxide2.2—
UN3299Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxide2.2—
UN3311Gas, refrigerated liquid, oxidizing, n.o.s. (cryogenic liquid)2.2—
UN3318Ammonia solution, relative density less than 0.880 at 15 degrees C in water, with more than 50 percent ammonia2.2—
UN3337Refrigerant gas R 404A2.2—
UN3338Refrigerant gas R 407A2.2—
UN3339Refrigerant gas R 407B2.2—
UN3340Refrigerant gas R 407C2.2—
UN3500Chemical under pressure, n.o.s2.2—
UN3502Chemical under pressure, toxic, n.o.s2.2—
UN3503Chemical under pressure, corrosive, n.o.s2.2—
UN3511Adsorbed gas, n.o.s2.2—
UN3513Adsorbed gas, oxidizing, n.o.s2.2—
UN3538Articles containing non-flammable, non-toxic gas, n.o.s.2.2—
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Other hazard classes

Class 1Class 2.1Class 2.3Class 3Class 4.1Class 4.2Class 4.3Class 5.1Class 5.2Class 6.1Class 6.2Class 7Class 8Class 9
Source: 49 CFR §172.101 via eCFR.gov, current as of Oct 23, 2026. Reference only.