UNunnums
3100

UN 3100Oxidizing solid, self-heating, n.o.s.

Division 5.1

Oxidizing substances

Summary

UN 3100 is the UN number for oxidizing solid, self-heating, n.o.s. It is classed in Division 5.1 (oxidizing substances) of Class 5 for transport. Packing group I or II, depending on the form. Emergency responders use ERG guide 135.

Emergency response

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

  • Guide135Oxidizing solid, self-heating, 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 3100
Name
Oxidizing solid, self-heating, n.o.s.
Hazard class
Class 5: Oxidizers and organic peroxides
Division
5.1: Oxidizing substances
Packing group
I, II
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.

  • UN3100Oxidizing solid, self-heating, n.o.s.

    • Technical name required in parentheses

    Special provisions: 62

    Class
    5.1
    Packing group
    I
    Labels
    5.1, 4.2

  • UN3100Oxidizing solid, self-heating, n.o.s.

    • Technical name required in parentheses

    Special provisions: 62

    Class
    5.1
    Packing group
    II
    Labels
    5.1, 4.2

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: