UNunnums
3370

UN 3370Urea nitrate, wetted, with not less than 10% water by mass

Division 4.1

Flammable solids

Summary

UN 3370 is the UN number for urea nitrate, wetted, with not less than 10% water by mass. It is classed in Division 4.1 (flammable solids) of Class 4 for transport. Packing group I. Emergency responders use ERG guide 113.

Emergency response

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

  • Guide113Urea nitrate, wetted with not less than 10% water

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 3370
Name
Urea nitrate, wetted, with not less than 10% water by mass
Hazard class
Class 4: Flammable solids
Division
4.1: Flammable solids
Packing group
I
What the class covers
Flammable solids, self-reactive substances and solid desensitized explosives.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN3370Urea nitrate, wetted

    with not less than 10 percent water by mass

    Special provisions: 162, A8, A19, N41, N84, W31

    Class
    4.1
    Packing group
    I
    Labels
    4.1

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 4

Class 4 covers flammable solids and other substances that can catch fire. Division 4.1 is flammable solids and self-reactive substances, 4.2 is substances that can spontaneously combust in air, and 4.3 is substances that give off flammable gas when wet.

See all Class 4 UN numbers

Check the official sources

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