UNunnums
1040

UN 1040Ethylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° C

Division 2.3

Toxic gases

Summary

UN 1040 is the UN number for ethylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° C. It is classed in Division 2.3 (toxic gases) of Class 2 for transport. Emergency responders use ERG guide 119P.

Emergency response

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

  • Guide119PEthylene oxideEthylene oxide with nitrogenHighlighted in green: see Table 1

Highlighted in green in the ERG. If there is no fire, go to ERG Table 1 for initial isolation and protective action distances, and also use the guide. If a fire is involved, use the guide's evacuation distances and protect downwind according to Table 1.

A “P” after the guide number means the material may suffer a violent polymerization.

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 1040
Name
Ethylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° C
Hazard class
Class 2: Gases
Division
2.3: Toxic gases
What the class covers
Gases known or presumed to be toxic or corrosive to humans.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN1040Ethylene oxide or Ethylene oxide with nitrogen

    up to a total pressure of 1 MPa (10 bar) at 50 degrees C

    Special provisions: 4, 342, T50, TP20

    Class
    2.3
    Packing group
    None
    Labels
    2.3, 2.1

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: