UNunnums
1003

UN 1003Air, refrigerated liquid, (cryogenic liquid) or Air, refrigerated liquid (cryogenic liquid) non-pressurized

Division 2.2

Non-flammable, non-toxic gases

Summary

UN 1003 is the UN number for air, refrigerated liquid, (cryogenic liquid) or Air, refrigerated liquid (cryogenic liquid) non-pressurized. It is classed in Division 2.2 (non-flammable, non-toxic gases) of Class 2 for transport. Emergency responders use ERG guide 122.

Emergency response

The Emergency Response Guidebook (ERG2024) guide for this number:

  • Guide122Air, refrigerated liquid (cryogenic liquid)

From the 2024 Emergency Response Guidebook (ERG2024), published by U.S. Department of Transportation, PHMSA. Read the full guide in the ERG or on CAMEO Chemicals.

Identification

UN number
UN 1003
Name
Air, refrigerated liquid, (cryogenic liquid) or Air, refrigerated liquid (cryogenic liquid) non-pressurized
Hazard class
Class 2: Gases
Division
2.2: Non-flammable, non-toxic gases
What the class covers
Gases which are neither flammable nor toxic, including asphyxiant and oxidizing gases.

U.S. Hazardous Materials Table

2 entries share this number in 49 CFR 172.101, by name, packing group or where the shipment is going.

  • UN1003Air, refrigerated liquid

    (cryogenic liquid)

    Special provisions: T75, TP5, TP22

    Class
    2.2
    Packing group
    None
    Labels
    2.2, 5.1

  • UN1003Air, refrigerated liquid

    (cryogenic liquid) non-pressurized

    Special provisions: T75, TP5, TP22

    Class
    2.2
    Packing group
    None
    Labels
    2.2, 5.1

From the eCFR edition of 49 CFR 172.101 dated 2026-10-05 (section last amended 2026-09-08). The eCFR is an editorial compilation, not the official legal edition. Read the current table.

About Class 2

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.

See all Class 2 UN numbers

Check the official sources

For emergency response, packaging and quantity limits, use these: