UNunnums
2845

UN 2845Pyrophoric liquids, organic, n.o.s.

Division 4.2

Spontaneously combustible

Summary

UN 2845 is the UN number for pyrophoric liquids, organic, n.o.s. It is classed in Division 4.2 (spontaneously combustible) of Class 4 for transport. Packing group I. Emergency responders use ERG guide 135.

Emergency response

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

  • Guide135Ethyl phosphonous dichloride, anhydrousMethyl phosphonous dichloridePyrophoric liquid, organic, n.o.s.Highlighted in green: see Table 1

Highlighted in green in the ERG. If there is no fire, go to ERG Table 1 for initial isolation and protective action distances, and also use the guide. If a fire is involved, use the guide's evacuation distances and protect downwind according to Table 1.

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 2845
Name
Pyrophoric liquids, organic, n.o.s.
Hazard class
Class 4: Flammable solids
Division
4.2: Spontaneously combustible
Packing group
I
What the class covers
Substances liable to spontaneous combustion.

U.S. Hazardous Materials Table

3 entries share this number in 49 CFR 172.101, by name, packing group or where the shipment is going.

  • UN2845Pyrophoric liquids, organic, n.o.s

    • Technical name required in parentheses

    Special provisions: B11, T22, TP2, TP7, W31

    Class
    4.2
    Packing group
    I
    Labels
    4.2

  • NA2845Ethyl phosphonous dichloride, anhydrous

    pyrophoric liquid

    • U.S. domestic shipments only

    Special provisions: 2, B9, B14, B32, T20, TP4, TP12, TP13, TP38, TP45

    Class
    6.1
    Packing group
    I
    Labels
    6.1, 4.2

  • NA2845Methyl phosphonous dichloride

    pyrophoric liquid

    • U.S. domestic shipments only

    Special provisions: 2, B9, B14, B16, B32, T20, TP4, TP12, TP13, TP38, TP45

    Class
    6.1
    Packing group
    I
    Labels
    6.1, 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: