UNunnums
2793

UN 2793Ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heating

Division 4.2

Spontaneously combustible

Summary

UN 2793 is the UN number for ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heating. It is classed in Division 4.2 (spontaneously combustible) of Class 4 for transport. Packing group III. Emergency responders use ERG guide 170.

Emergency response

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

  • Guide170Ferrous metal borings, shavings, turnings or cuttings

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 2793
Name
Ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heating
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.

  • UN2793Ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings

    in a form liable to self-heating

    Special provisions: A1, A19, B134, B136, IB8, IP3, IP7, IP21, W100

    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: