UNunnums
1856

UN 1856Rags, oily

Division 4.2

Spontaneously combustible

Summary

UN 1856 is the UN number for rags, oily. It is classed in Division 4.2 (spontaneously combustible) of Class 4 for transport. Packing group III. Emergency responders use ERG guide 133.

Emergency response

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

  • Guide133Rags, oily

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 1856
Name
Rags, oily
Hazard class
Class 4: Flammable solids
Division
4.2: Spontaneously combustible
Packing group
III
What the class covers
Substances liable to spontaneous combustion.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN1856Rags, oily

    • Regulated only when shipped by air
    • Regulated only when shipped by water
    Class
    4.2
    Packing group
    III
    Labels
    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 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: