UNunnums
1228

UN 1228Mercaptans, liquid, flammable, toxic, n.o.s. or mercaptan mixtures, liquid, flammable, toxic, n.o.s.

Class 3

Flammable liquids

Summary

UN 1228 is the UN number for mercaptans, liquid, flammable, toxic, n.o.s. or mercaptan mixtures, liquid, flammable, toxic, n.o.s. It is classed in Class 3 (flammable liquids) for transport. Packing group II or III, depending on the form. Emergency responders use ERG guide 131.

Emergency response

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

  • Guide131Mercaptan mixture, liquid, flammable, poisonous, n.o.s.Mercaptan mixture, liquid, flammable, toxic, n.o.s.Mercaptans, liquid, flammable, poisonous, n.o.s.Mercaptans, liquid, flammable, toxic, 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 1228
Name
Mercaptans, liquid, flammable, toxic, n.o.s. or mercaptan mixtures, liquid, flammable, toxic, n.o.s.
Hazard class
Class 3: Flammable liquids
Packing group
II, III
What the class covers
Flammable liquids (and, in the U.S., combustible liquids).

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.

  • UN1228Mercaptans, liquid, flammable, toxic, n.o.s. or Mercaptan mixtures, liquid, flammable, toxic, n.o.s.

    Special provisions: IB2, T11, TP2, TP27

    Class
    3
    Packing group
    II
    Labels
    3, 6.1

  • UN1228Mercaptans, liquid, flammable, toxic, n.o.s. or Mercaptan mixtures, liquid, flammable, toxic, n.o.s.

    Special provisions: B1, IB3, T7, TP1, TP28

    Class
    3
    Packing group
    III
    Labels
    3, 6.1

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 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: