UNunnums
3394

UN 3394Organometallic substance, liquid, pyrophoric, water-reactive

Division 4.2

Spontaneously combustible

Summary

UN 3394 is the UN number for organometallic substance, liquid, pyrophoric, water-reactive. It is classed in Division 4.2 (spontaneously combustible) of Class 4 for transport. Packing group I. Emergency responders use ERG guide 135.

Emergency response

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

  • Guide135Organometallic substance, liquid, pyrophoric, water-reactive

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 3394
Name
Organometallic substance, liquid, pyrophoric, water-reactive
Hazard class
Class 4: Flammable solids
Division
4.2: Spontaneously combustible
Packing group
I
What the class covers
Substances liable to spontaneous combustion.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN3394Organometallic substance, liquid, pyrophoric, water-reactive

    • Technical name required in parentheses

    Special provisions: B11, T21, TP2, TP7, TP36, TP47

    Class
    4.2
    Packing group
    I
    Labels
    4.2, 4.3

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: