UNunnums
3226

UN 3226Self-reactive solid type D

Division 4.1

Flammable solids

Summary

UN 3226 is the UN number for self-reactive solid type D. It is classed in Division 4.1 (flammable solids) of Class 4 for transport. Emergency responders use ERG guide 149.

Emergency response

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

  • Guide149Self-reactive solid type D

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 3226
Name
Self-reactive solid type D
Hazard class
Class 4: Flammable solids
Division
4.1: Flammable solids
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.

  • UN3226Self-reactive solid type D

    • Technical name required in parentheses
    Class
    4.1
    Packing group
    None
    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: