UNunnums
2283

UN 2283Isobutyl methacrylate, inhibited

Proper shipping name: Isobutyl methacrylate, stabilized

Class 3

Flammable liquids

Summary

UN 2283 is the UN number for isobutyl methacrylate, inhibited. It is classed in Class 3 (flammable liquids) for transport. Packing group III. Emergency responders use ERG guide 130P.

Emergency response

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

  • Guide130PIsobutyl methacrylate, stabilized

A “P” after the guide number means the material may suffer a violent polymerization.

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 2283
Name
Isobutyl methacrylate, inhibited
Hazard class
Class 3: Flammable liquids
Packing group
III
What the class covers
Flammable liquids (and, in the U.S., combustible liquids).

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN2283Isobutyl methacrylate, stabilized

    Special provisions: 387, B1, IB3, T2, TP1

    Class
    3
    Packing group
    III
    Labels
    3

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 3

Class 3 covers flammable liquids such as gasoline, diesel, solvents, paints and alcohols. In the United States, some liquids with higher flash points can also be shipped as combustible liquids under the same class.

See all Class 3 UN numbers

Check the official sources

For emergency response, packaging and quantity limits, use these: