UNunnums
3356

UN 3356Oxygen generator, chemical

Division 5.1

Oxidizing substances

Summary

UN 3356 is the UN number for oxygen generator, chemical. 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:

  • Guide140Oxygen generator, chemicalOxygen generator, chemical, spent

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 3356
Name
Oxygen generator, chemical
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

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

  • UN3356Oxygen generator, chemical

    (including when contained in associated equipment, e.g., passenger service units (PSUs), portable breathing equipment (PBE), etc)

    Class
    5.1
    Packing group
    None
    Labels
    5.1

  • NA3356Oxygen generator, chemical, spent

    • Name, class and packing group fixed by regulation

    Special provisions: 61

    Class
    9
    Packing group
    III
    Labels
    9

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: