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Class 2: Gases

241 UN numbers

Class 2 covers gases, whether compressed, liquefied, dissolved under pressure or refrigerated. Division 2.1 is flammable gases such as propane, 2.2 is non-flammable, non-toxic gases such as nitrogen, and 2.3 is toxic gases such as chlorine.

Class 2, no division listed

These entries are recorded with the main class only. Check the official table for the division.

UN numberName
1014Carbon dioxide and oxygen mixtures, compressedGases
1015Carbon dioxide and nitrous oxide mixturesGases
1979Rare gases, mixtures, compressedGases
1980Rare gases and oxygen mixtures, compressedGases
1981Rare gases and nitrogen mixtures, compressedGases
2600Carbon monoxide and hydrogen mixture, compressedGases

Division 2.1: Flammable gases

Gases which ignite on contact with an ignition source.

UN numberName
1001Acetylene, dissolvedFlammable gases, guide 116
1010Butadienes, inhibitedFlammable gases, guide 116P
1011ButaneFlammable gases, guide 115
1012ButyleneFlammable gases, guide 115
1027CyclopropaneFlammable gases, guide 115
10301,1-Difluoroethane or Refrigerant gas R 152aFlammable gases, guide 115
1032Dimethylamine, anhydrousFlammable gases, guide 118
1033Dimethyl etherFlammable gases, guide 115
1035EthaneFlammable gases, guide 115
1036EthylamineFlammable gases, guide 118
1037Ethyl chlorideFlammable gases, guide 115
1038Ethylene, refrigerated liquid (cryogenic liquid)Flammable gases, guide 115
1039Ethyl methyl etherFlammable gases, guide 115
1041Ethylene oxide and carbon dioxide mixtures with more than 9 percent but not more than 87 percent ethylene oxideFlammable gases, guide 115
1049Hydrogen, compressedFlammable gases, guide 115
1055IsobutyleneFlammable gases, guide 115
1057Lighters or Lighter refills cigarettes, containing flammable gasFlammable gases, guide 115/128
1060Methyl acetylene and propadiene mixtures, stabilizedFlammable gases, guide 116P
1061Methylamine, anhydrousFlammable gases, guide 118
1063Methyl chloride, or Refrigerant gas R 40Flammable gases, guide 115
1075Petroleum gases, liquefied or Liquefied petroleum gasFlammable gases, guide 115
1077PropyleneFlammable gases, guide 115
1081Tetrafluoroethylene, inhibitedFlammable gases, guide 116P
1083Trimethylamine, anhydrousFlammable gases, guide 118
1085Vinyl bromide, inhibitedFlammable gases, guide 116P
1086Vinyl chloride, inhibited or Vinyl chloride, stabilizedFlammable gases, guide 116P
1087Vinyl methyl ether, inhibitedFlammable gases, guide 116P
1860Vinyl fluoride, inhibitedFlammable gases, guide 116P
1912Methyl chloride and methylene chloride mixturesFlammable gases, guide 115
1954Compressed gas, flammable, n.o.s.Flammable gases, guide 115
1957Deuterium, compressedFlammable gases, guide 115
19591,1-Difluoroethylene or Refrigerant gas R 1132aFlammable gases, guide 116P
1961Ethane, refrigerated liquidFlammable gases, guide 115
1962Ethylene, compressedFlammable gases, guide 116P
1964Hydrocarbon gas mixture, compressed, n.o.s.Flammable gases, guide 115
1965Hydrocarbon gas mixtures, liquefied, n.o.s.Flammable gases, guide 115
1966Liquid hydrogen, refrigerated liquid (cryogenic liquid)Flammable gases, guide 115
1969IsobutaneFlammable gases, guide 115
1971Methane, compressed or Natural gas, compressed (with high methane content)Flammable gases, guide 115
1972Methane, refrigerated liquid (cryogenic liquid) or Natural gas, refrigerated liquid (cryogenic liquid), with high methane contentFlammable gases, guide 115
1978PropaneFlammable gases, guide 115
2034Hydrogen and Methane mixtures, compressedFlammable gases, guide 115
20351,1,1-Trifluoroethane, compressed or Refrigerant gas R 143aFlammable gases, guide 115
2037Gas cartridges (flammable) without a release device, non-refillable or Receptacles, small, containing gas (gas cartridges) flammable or nonflammable, without release device, not refillable and not exceeding 1 L capacityFlammable gases, guide 115
20442,2-DimethylpropaneFlammable gases, guide 115
2200Propadiene, inhibitedFlammable gases, guide 116P
2203Silane, compressedFlammable gases, guide 116
2419BromotrifluoroethyleneFlammable gases, guide 116
2452Ethylacetylene, inhibitedFlammable gases, guide 116P
2453Ethyl fluoride or Refrigerant gas R 161Flammable gases, guide 115
2454Methyl fluoride, or Refrigerant gas R 41Flammable gases, guide 115
25171-Chloro-1,1-difluoroethane or Refrigerant gas R 142bFlammable gases, guide 115
2601CyclobutaneFlammable gases, guide 115
3138Ethylene, acetylene and propylene mixture, refrigerated liquid, with not less than 71,5 % ethylene, not more than 22,5 % acetylene and not more than 6 % propyleneFlammable gases, guide 115
3150Devices, small, hydrocarbon gas powered or Hydrocarbon gas refills for small devices, with release deviceFlammable gases, guide 115
3153Perfluoro(methyl vinyl ether)Flammable gases, guide 115
3154Perfluoro(ethyl vinyl ether)Flammable gases, guide 115
3161Liquefied gas, flammable, n.o.s.Flammable gases, guide 115
3167Gas sample, non-pressurized, flammable, n.o.s., not refrigerated liquidFlammable gases, guide 115
3252Difluoromethane or Refrigerant gas R 32Flammable gases, guide 115
3312Gas, refrigerated liquid, flammable, n.o.s.Flammable gases, guide 115
3354Insecticide gas, flammable, n.o.s.Flammable gases, guide 115
3358Refrigerating machines, containing flammable, non-toxic, liquefied gasFlammable gases, guide 115
3374Acetylene, solvent freeFlammable gases, guide 116
3468Hydrogen in metal hydride storage systemFlammable gases, guide 115
3478Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment, containing liquefied flammable gasFlammable gases, guide 115
3479Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment, containing hydrogen in metal hydrideFlammable gases, guide 115
3501Chemical under pressure, flammable, n.o.sFlammable gases, guide 115
3504Chemical under pressure, flammable, toxic, n.o.sFlammable gases, guide 119
3505Chemical under pressure, flammable, corrosive, n.o.sFlammable gases, guide 118
3510Adsorbed gas, flammable, n.o.sFlammable gases, guide 174
3529Engine, internal combustion, flammable gas powered or Engine, fuel cell, flammable gas powered or Machinery, internal combustion, flammable gas powered or Machinery, fuel cell, flammable gas poweredFlammable gases, guide 115
3537Articles containing flammable gas, n.o.s.Flammable gases, guide 115

Division 2.2: Non-flammable, non-toxic gases

Gases which are neither flammable nor toxic, including asphyxiant and oxidizing gases.

UN numberName
1002Air, compressedNon-flammable, non-toxic gases, guide 122
1003Air, refrigerated liquid, (cryogenic liquid) or Air, refrigerated liquid (cryogenic liquid) non-pressurizedNon-flammable, non-toxic gases, guide 122
1006Argon, compressedNon-flammable, non-toxic gases, guide 120
1009Bromotrifluoromethane or Refrigerant gas, R 13B1Non-flammable, non-toxic gases, guide 126
1013Carbon dioxideNon-flammable, non-toxic gases, guide 120
1018Chlorodifluoromethane or Refrigerant gas R 22Non-flammable, non-toxic gases, guide 126
1020Chloropentafluoroethane or Refrigerant gas R 115Non-flammable, non-toxic gases, guide 126
10211-Chloro-1,2,2,2-tetrafluoroethane or Refrigerant gas R 124Non-flammable, non-toxic gases, guide 126
1022Chlorotrifluoromethane or Refrigerant gas R 13Non-flammable, non-toxic gases, guide 126
1028Dichlorodifluoromethane or Refrigerant gas R 12Non-flammable, non-toxic gases, guide 126
1029Dichlorofluoromethane or Refrigerant gas R 21Non-flammable, non-toxic gases, guide 126
1043Fertilizer ammoniating solution with free ammoniaNon-flammable, non-toxic gases, guide 125
1044Fire extinguishers containing compressed or liquefied gasNon-flammable, non-toxic gases, guide 126
1046Helium, compressedNon-flammable, non-toxic gases, guide 120
1056Krypton, compressedNon-flammable, non-toxic gases, guide 120
1058Liquified gases, nonflammable charged with nitrogen, carbon dioxide, or airNon-flammable, non-toxic gases, guide 120
1065Neon, compressedNon-flammable, non-toxic gases, guide 120
1066Nitrogen, compressedNon-flammable, non-toxic gases, guide 120
1070Nitrous oxideNon-flammable, non-toxic gases, guide 122
1072Oxygen, compressedNon-flammable, non-toxic gases, guide 122
1073Oxygen, refrigerated liquid (cryogenic liquid)Non-flammable, non-toxic gases, guide 122
1078Refrigerant gases, n.o.s.Non-flammable, non-toxic gases, guide 126
1080Sulfur hexafluorideNon-flammable, non-toxic gases, guide 126
1858Hexafluoropropylene, compressed or Refrigerant gas R 1216Non-flammable, non-toxic gases, guide 126
1913Neon, refrigerated liquid (cryogenic liquid)Non-flammable, non-toxic gases, guide 120
1950Aerosols, corrosive, Packing Group II or III, (each not exceeding 1 L capacity) or Aerosols, flammable (each not exceeding 1 L capacity) or Aerosols, flammable, n.o.s. (engine starting fluid) (each not exceeding 1 L capacity) or Aerosols, nonflammable (each not exceeding 1 L capacity) or Aerosols, poison, each not exceeding 1 L capacityNon-flammable, non-toxic gases, guide 126
1951Argon, refrigerated liquid (cryogenic liquid)Non-flammable, non-toxic gases, guide 120
1952Ethylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxideNon-flammable, non-toxic gases, guide 126
1956Compressed gas, n.o.s.Non-flammable, non-toxic gases, guide 126
19581,2-dichloro-1,1,2,2-tetrafluoroethane or Refrigerant gas R 114Non-flammable, non-toxic gases, guide 126
1963Helium, refrigerated liquid (cryogenic liquid)Non-flammable, non-toxic gases, guide 120
1968Insecticide gases, n.o.s.Non-flammable, non-toxic gases, guide 126
1970Krypton, refrigerated liquid (cryogenic liquid)Non-flammable, non-toxic gases, guide 120
1973Chlorodifluoromethane and chloropentafluoroethane mixture or Refrigerant gas R 502 with fixed boiling point, with approximately 49 percent chlorodifluoromethaneNon-flammable, non-toxic gases, guide 126
1974Chlorodifluorobromomethane or Refrigerant gas R 12B1Non-flammable, non-toxic gases, guide 126
1976Octafluorocyclobutane, or Refrigerant gas RC 318Non-flammable, non-toxic gases, guide 126
1977Nitrogen, refrigerated liquid cryogenic liquidNon-flammable, non-toxic gases, guide 120
1982Tetrafluoromethane, compressed or Refrigerant gas R 14Non-flammable, non-toxic gases, guide 126
19831-Chloro-2,2,2-trifluoroethane or Refrigerant gas R 133aNon-flammable, non-toxic gases, guide 126
1984Trifluoromethane or Refrigerant gas R 23Non-flammable, non-toxic gases, guide 126
2036Xenon, compressedNon-flammable, non-toxic gases, guide 120
2073Ammonia solution, relative density less than 0.880 at 15° C in water, with more than 35 percent but not more than 50 percent ammoniaNon-flammable, non-toxic gases, guide 125
2187Carbon dioxide, refrigerated liquidNon-flammable, non-toxic gases, guide 120
2193Hexafluoroethane, compressed or Refrigerant gas R 116Non-flammable, non-toxic gases, guide 126
2201Nitrous oxide, refrigerated liquidNon-flammable, non-toxic gases, guide 122
2422Octafluorobut-2-ene or Refrigerant gas R 1318Non-flammable, non-toxic gases, guide 126
2424Octafluoropropane or Refrigerant gas R 218Non-flammable, non-toxic gases, guide 126
2451Nitrogen trifluoride, compressedNon-flammable, non-toxic gases, guide 122
2591Xenon, refrigerated liquid (cryogenic liquids)Non-flammable, non-toxic gases, guide 120
2599Chlorotrifluoromethane and trifluoromethane azeotropic mixture or Refrigerant gas R 503 with approximately 60 percent chlorotrifluoromethaneNon-flammable, non-toxic gases, guide 126
2602Dichlorodifluoromethane and difluoroethane azeotropic mixture or Refrigerant gas R 500 with approximately 74 percent dichlorodifluoromethaneNon-flammable, non-toxic gases, guide 126
2857Refrigerating machines, containing nonflammable, nontoxic, liquefied gas or ammonia solution (UN2672)Non-flammable, non-toxic gases, guide 126
3070Ethylene oxide and dichlorodifluoromethane mixture with not more than 12.5 percent ethylene oxideNon-flammable, non-toxic gases, guide 126
3136Trifluoromethane, refrigerated liquidNon-flammable, non-toxic gases, guide 120
3156Compressed gas, oxidizing, n.o.s.Non-flammable, non-toxic gases, guide 122
3157Liquefied gas, oxidizing, n.o.s.Non-flammable, non-toxic gases, guide 122
3158Gas, refrigerated liquid, n.o.s. (cryogenic liquid)Non-flammable, non-toxic gases, guide 120
31591,1,1,2-Tetrafluoroethane or Refrigerant gas R 134aNon-flammable, non-toxic gases, guide 126
3163Liquefied gas, n.o.s.Non-flammable, non-toxic gases, guide 126
3164Articles, pressurized pneumatic or Hydraulic (containing non-flammable gas)Non-flammable, non-toxic gases, guide 126
3220Pentafluoroethane or Refrigerant gas R 125Non-flammable, non-toxic gases, guide 126
3296Heptafluoropropane or Refrigerant gas R 227Non-flammable, non-toxic gases, guide 126
3297Ethylene oxide and chlorotetrafluoroethane mixture with not more than 8.8 percent ethylene oxideNon-flammable, non-toxic gases, guide 126
3298Ethylene oxide and pentafluoroethane mixture with not more than 7.9 percent ethylene oxideNon-flammable, non-toxic gases, guide 126
3299Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxideNon-flammable, non-toxic gases, guide 126
3311Gas, refrigerated liquid, oxidising, n.o.s.Non-flammable, non-toxic gases, guide 122
3337Refrigerant gas R404ANon-flammable, non-toxic gases, guide 126
3338Refrigerant gas R407ANon-flammable, non-toxic gases, guide 126
3339Refrigerant gas R407BNon-flammable, non-toxic gases, guide 126
3340Refrigerant gas R407CNon-flammable, non-toxic gases, guide 126
3500Chemical under Pressure, N.O.S.}Non-flammable, non-toxic gases, guide 126
3502Chemical under pressure, toxic, n.o.sNon-flammable, non-toxic gases, guide 123
3503Chemical under pressure, corrosive, n.o.sNon-flammable, non-toxic gases, guide 125
3511Adsorbed gas, n.o.sNon-flammable, non-toxic gases, guide 174
3513Adsorbed gas, oxidizing, n.o.sNon-flammable, non-toxic gases, guide 174
3538Articles containing non-flammable, non-toxic gas, n.o.s.Non-flammable, non-toxic gases, guide 120

Division 2.3: Toxic gases

Gases known or presumed to be toxic or corrosive to humans.

UN numberName
1005Ammonia, anhydrousToxic gases, guide 125
1008Boron trifluoride, compressedToxic gases, guide 125
1016Carbon monoxide, compressedToxic gases, guide 119
1017ChlorineToxic gases, guide 124
1023Coal gas, compressedToxic gases, guide 119
1026CyanogenToxic gases, guide 119
1040Ethylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° CToxic gases, guide 119P
1045Fluorine, compressedToxic gases, guide 124
1048Hydrogen bromide, anhydrousToxic gases, guide 125
1050Hydrogen chloride, anhydrousToxic gases, guide 125
1053Hydrogen sulfideToxic gases, guide 117
1062Methyl bromideToxic gases, guide 123
1064Methyl mercaptanToxic gases, guide 117
1067Dinitrogen tetroxideToxic gases, guide 124
1069Nitrosyl chlorideToxic gases, guide 125
1071Oil gas, compressedToxic gases, guide 119
1076PhosgeneToxic gases, guide 125
1079Sulfur dioxideToxic gases, guide 125
1082Trifluorochloroethylene, inhibitedToxic gases, guide 119P
1581Chloropicrin and methyl bromide mixturesToxic gases, guide 123
1582Chloropicrin and methyl chloride mixturesToxic gases, guide 119
1589Cyanogen chloride, inhibitedToxic gases, guide 125
1612Hexaethyl tetraphosphate and compressed gas mixturesToxic gases, guide 123
1660Nitric oxide, compressedToxic gases, guide 124
1741Boron trichlorideToxic gases, guide 125
1749Chlorine trifluorideToxic gases, guide 124
1859Silicon tetrafluoride, compressedToxic gases, guide 125
1911Diborane, compressedToxic gases, guide 119
1953Compressed gas, toxic, flammable, n.o.s. Inhalation Hazard Zone A, B, C, or DToxic gases, guide 119
1955Compressed gas, toxic, n.o.s. Inhalation Hazard Zone A, B, C, or DToxic gases, guide 123
1967Insecticide gases, toxic, n.o.s.Toxic gases, guide 123
1975Nitric oxide and dinitrogen tetroxide mixtures or Nitric oxide and nitrogen dioxide mixturesToxic gases, guide 124
2186Hydrogen chloride, refrigerated liquidToxic gases, guide 125
2188ArsineToxic gases, guide 119
2189DichlorosilaneToxic gases, guide 119
2190Oxygen difluoride, compressedToxic gases, guide 124
2191Sulfuryl fluorideToxic gases, guide 123
2192GermaneToxic gases, guide 119
2194Selenium hexafluorideToxic gases, guide 125
2195Tellurium hexafluorideToxic gases, guide 125
2196Tungsten hexafluorideToxic gases, guide 125
2197Hydrogen iodide, anhydrousToxic gases, guide 125
2198Phosphorus pentafluoride, compressedToxic gases, guide 125
2199PhosphineToxic gases, guide 119
2202Hydrogen selenide, anhydrousToxic gases, guide 117
2204Carbonyl sulfideToxic gases, guide 119
2417Carbonyl fluoride, compressedToxic gases, guide 125
2418Sulfur tetrafluorideToxic gases, guide 125
2420HexafluoroacetoneToxic gases, guide 125
2421Nitrogen trioxideToxic gases, guide 124
2534MethylchlorosilaneToxic gases, guide 119
2548Chlorine pentafluorideToxic gases, guide 124
2676StibineToxic gases, guide 119
2901Bromine chlorideToxic gases, guide 124
3057Trifluoroacetyl chlorideToxic gases, guide 125
3083Perchloryl fluorideToxic gases, guide 124
3160Liquefied gas, toxic, flammable, n.o.s. Inhalation Hazard Zone A, B, C, or DToxic gases, guide 119
3162Liquefied gas, toxic, n.o.s. Inhalation Hazard Zone A, B, C, or DToxic gases, guide 123
3168Gas sample, non-pressurized, toxic, flammable, n.o.s., not refrigerated liquidToxic gases, guide 119
3169Gas sample, non-pressurized, toxic, n.o.s., not refrigerated liquidToxic gases, guide 123
3300Ethylene oxide and carbon dioxide mixture with more than 87 percent ethylene oxideToxic gases, guide 119P
3303Compressed gas, toxic, oxidising, n.o.s.Toxic gases, guide 124
3304Compressed gas, toxic, corrosive, n.o.s.Toxic gases, guide 125
3305Compressed gas, toxic, flammable, corrosive, n.o.s.Toxic gases, guide 119
3306Compressed gas, toxic, oxidising, corrosive, n.o.s.Toxic gases, guide 124
3307Liquefied gas, toxic, oxidising, n.o.s.Toxic gases, guide 124
3308Liquefied gas, toxic, corrosive, n.o.s.Toxic gases, guide 125
3309Liquefied gas, toxic, flammable, corrosive, n.o.s.Toxic gases, guide 119
3310Liquefied gas, toxic, oxidising, corrosive, n.o.s.Toxic gases, guide 124
3318Ammonia solution, relative density less than 0.880 at 15 °C in water, with more than 50% ammoniaToxic gases, guide 125
3355Insecticide gas, toxic, flammable, n.o.s.Toxic gases, guide 119
3512Adsorbed gas, toxic, n.o.s.Toxic gases, guide 173
3514Adsorbed gas, toxic, flammable, n.o.s.Toxic gases, guide 173
3515Adsorbed gas, toxic, oxidizing, n.o.s.Toxic gases, guide 173
3516Adsorbed gas, toxic, corrosive, n.o.s.Toxic gases, guide 173
3517Adsorbed gas, toxic, flammable, corrosive, n.o.s.Toxic gases, guide 173
3518Adsorbed gas, toxic, oxidizing, corrosive, n.o.s.Toxic gases, guide 173
3519Boron trifluoride, adsorbedToxic gases, guide 173
3520Chlorine, adsorbedToxic gases, guide 173
3521Silicon tetrafluoride, adsorbedToxic gases, guide 173
3522Arsine, adsorbedToxic gases, guide 173
3523Germane, adsorbedToxic gases, guide 173
3524Phosphorus pentafluoride, adsorbedToxic gases, guide 173
3525Phosphine, adsorbedToxic gases, guide 173
3526Hydrogen selenide, adsorbedToxic gases, guide 173
3539Articles containing toxic gas, n.o.s.Toxic gases, guide 123