UNunnums
2501

UN 2501Tris-(1-aziridinyl)phosphine oxide, solution

Division 6.1

Toxic substances

Summary

UN 2501 is the UN number for tris-(1-aziridinyl)phosphine oxide, solution. It is classed in Division 6.1 (toxic substances) of Class 6 for transport. Packing group II or III, depending on the form. Emergency responders use ERG guide 152.

Emergency response

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

  • Guide152Tris-(1-aziridinyl)phosphine oxide, solution

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 2501
Name
Tris-(1-aziridinyl)phosphine oxide, solution
Hazard class
Class 6: Toxic and infectious substances
Division
6.1: Toxic substances
Packing group
II, III
What the class covers
Substances liable to cause death, serious injury or harm to health if swallowed, inhaled or absorbed through the skin.

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.

  • UN2501Tris-(1-aziridinyl)phosphine oxide, solution

    Special provisions: IB2, T7, TP2

    Class
    6.1
    Packing group
    II
    Labels
    6.1

  • UN2501Tris-(1-aziridinyl)phosphine oxide, solution

    Special provisions: IB3, T4, TP1

    Class
    6.1
    Packing group
    III
    Labels
    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 6

Class 6 covers poisons and infectious material. Division 6.1 is toxic substances that harm people if swallowed, inhaled or absorbed through the skin; 6.2 is infectious substances such as cultures and medical waste.

See all Class 6 UN numbers

Check the official sources

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