UNunnums
1611

UN 1611Hexaethyl tetraphosphate, liquid or Hexaethyl tetraphosphate, solid

Division 6.1

Toxic substances

Summary

UN 1611 is the UN number for hexaethyl tetraphosphate, liquid or Hexaethyl tetraphosphate, solid. It is classed in Division 6.1 (toxic substances) of Class 6 for transport. Packing group II. Emergency responders use ERG guide 151.

Emergency response

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

  • Guide151Hexaethyl tetraphosphate

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 1611
Name
Hexaethyl tetraphosphate, liquid or Hexaethyl tetraphosphate, solid
Hazard class
Class 6: Toxic and infectious substances
Division
6.1: Toxic substances
Packing group
II
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.

  • UN1611Hexaethyl tetraphosphate

    liquid

    Special provisions: IB2, N76, T7, TP2

    Class
    6.1
    Packing group
    II
    Labels
    6.1

  • UN1611Hexaethyl tetraphosphate

    solid

    Special provisions: IB8, IP2, IP4, N76

    Class
    6.1
    Packing group
    II
    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: