UNunnums
2557

UN 2557Nitrocellulose, with not more than 12.6 percent nitrogen, by dry mass, or Nitrocellulose mixture with pigment or Nitrocellulose mixture with plasticizer or Nitrocellulose mixture with pigment and plasticizer

Proper shipping name: Nitrocellulose, mixture with or without plasticizer, with or without pigment

Division 4.1

Flammable solids

Summary

UN 2557 is the UN number for nitrocellulose, with not more than 12.6 percent nitrogen, by dry mass, or Nitrocellulose mixture with pigment or Nitrocellulose mixture with plasticizer or Nitrocellulose mixture with pigment and plasticizer. It is classed in Division 4.1 (flammable solids) of Class 4 for transport. Packing group II. Emergency responders use ERG guide 133.

Emergency response

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

  • Guide133Nitrocellulose mixture, with or without pigmentNitrocellulose mixture, with or without plasticizer

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 2557
Name
Nitrocellulose, with not more than 12.6 percent nitrogen, by dry mass, or Nitrocellulose mixture with pigment or Nitrocellulose mixture with plasticizer or Nitrocellulose mixture with pigment and plasticizer
Hazard class
Class 4: Flammable solids
Division
4.1: Flammable solids
Packing group
II
What the class covers
Flammable solids, self-reactive substances and solid desensitized explosives.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN2557Nitrocellulose, mixture with or without plasticizer, with or without pigment

    with not more than 12.6 percent nitrogen, by dry mass

    Special provisions: 44, W31

    Class
    4.1
    Packing group
    II
    Labels
    4.1

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 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: