UNunnums
2784

UN 2784Organophosphorus pesticides, liquid, flammable, toxic, flashpoint less than 23° C

Class 3

Flammable liquids

Summary

UN 2784 is the UN number for organophosphorus pesticides, liquid, flammable, toxic, flashpoint less than 23° C. It is classed in Class 3 (flammable liquids) for transport. Packing group I or II, depending on the form. Emergency responders use ERG guide 131.

Emergency response

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

  • Guide131Organophosphorus pesticide, liquid, flammable, poisonousOrganophosphorus pesticide, liquid, flammable, toxic

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 2784
Name
Organophosphorus pesticides, liquid, flammable, toxic, flashpoint less than 23° C
Hazard class
Class 3: Flammable liquids
Packing group
I, II
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.

  • UN2784Organophosphorus pesticides, liquid, flammable, toxic

    flash point less than 23 degrees C

    Special provisions: T14, TP2, TP13, TP27

    Class
    3
    Packing group
    I
    Labels
    3, 6.1

  • UN2784Organophosphorus pesticides, liquid, flammable, toxic

    flash point less than 23 degrees C

    Special provisions: IB2, T11, TP2, TP13, TP27

    Class
    3
    Packing group
    II
    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: