UNunnums
2989

UN 2989Lead phosphite, dibasic

Division 4.1

Flammable solids

Summary

UN 2989 is the UN number for lead phosphite, dibasic. It is classed in Division 4.1 (flammable solids) of Class 4 for transport. Packing group II or III, depending on the form. Emergency responders use ERG guide 133.

Emergency response

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

  • Guide133Lead phosphite, dibasic

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 2989
Name
Lead phosphite, dibasic
Hazard class
Class 4: Flammable solids
Division
4.1: Flammable solids
Packing group
II, III
What the class covers
Flammable solids, self-reactive substances and solid desensitized explosives.

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.

  • UN2989Lead phosphite, dibasic

    Special provisions: IB8, IP2, IP4, T3, TP33

    Class
    4.1
    Packing group
    II
    Labels
    4.1

  • UN2989Lead phosphite, dibasic

    Special provisions: IB8, IP3, T1, TP33

    Class
    4.1
    Packing group
    III
    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: