UNunnums
3318

UN 3318Ammonia solution, relative density less than 0.880 at 15 °C in water, with more than 50% ammonia

Division 2.3

Toxic gases

Division 2.2 for U.S. domestic shipments

Summary

UN 3318 is the UN number for ammonia solution, relative density less than 0.880 at 15 °C in water, with more than 50% ammonia. It is classed in Division 2.3 (toxic gases) of Class 2 for transport. Emergency responders use ERG guide 125.

Emergency response

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

  • Guide125Ammonia solution, with more than 50% ammoniaHighlighted 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.

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 3318
Name
Ammonia solution, relative density less than 0.880 at 15 °C in water, with more than 50% ammonia
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

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

  • UN3318Ammonia solution

    relative density less than 0.880 at 15 degrees C in water, with more than 50 percent ammonia

    • International shipments

    Special provisions: 4, N87, T50

    Class
    2.3
    Packing group
    None
    Labels
    2.3, 8

  • UN3318Ammonia solution

    relative density less than 0.880 at 15 degrees C in water, with more than 50 percent ammonia

    • U.S. domestic shipments only

    Special provisions: 13, T50

    Class
    2.2
    Packing group
    None
    Labels
    2.2

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: