UNunnums
3544

UN 3544Articles containing oxidizing substance, n.o.s.

Division 5.1

Oxidizing substances

Summary

UN 3544 is the UN number for articles containing oxidizing substance, n.o.s. It is classed in Division 5.1 (oxidizing substances) of Class 5 for transport. Emergency responders use ERG guide 140.

Emergency response

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

  • Guide140Articles containing oxidizing substance, n.o.s.

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 3544
Name
Articles containing oxidizing substance, n.o.s.
Hazard class
Class 5: Oxidizers and organic peroxides
Division
5.1: Oxidizing substances
What the class covers
Substances which may cause or contribute to the combustion of other material, generally by yielding oxygen.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN3544Articles containing oxidizing substance, n.o.s.

    • Technical name required in parentheses

    Special provisions: 131, 391

    Class
    5.1
    Packing group
    None
    Labels
    5.1

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 5

Class 5 covers substances that supply oxygen or otherwise intensify a fire. Division 5.1 is oxidizers such as ammonium nitrate and hydrogen peroxide; 5.2 is organic peroxides, which may also be thermally unstable.

See all Class 5 UN numbers

Check the official sources

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