UNunnums
3138

UN 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 % propylene

Proper shipping name: Ethylene, acetylene and propylene in mixture, refrigerated liquid

Division 2.1

Flammable gases

Summary

UN 3138 is the UN number for ethylene, acetylene and propylene mixture, refrigerated liquid, with not less than 71,5 % ethylene, not more than 22,5 % acetylene and not more than 6 % propylene. It is classed in Division 2.1 (flammable gases) of Class 2 for transport. Emergency responders use ERG guide 115.

Emergency response

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

  • Guide115Ethylene, acetylene and propylene mixture, refrigerated liquid containing at least 71.5% ethylene with not more than 22.5% acetylene and not more than 6% propylene

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 3138
Name
Ethylene, acetylene and propylene mixture, refrigerated liquid, with not less than 71,5 % ethylene, not more than 22,5 % acetylene and not more than 6 % propylene
Hazard class
Class 2: Gases
Division
2.1: Flammable gases
What the class covers
Gases which ignite on contact with an ignition source.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN3138Ethylene, acetylene and propylene in mixture, refrigerated liquid

    with at least 71.5 percent ethylene with not more than 22.5 percent acetylene and not more than 6 percent propylene

    Special provisions: T75, TP5

    Class
    2.1
    Packing group
    None
    Labels
    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: