UNunnums
1612

UN 1612Hexaethyl tetraphosphate and compressed gas mixtures

Division 2.3

Toxic gases

Summary

UN 1612 is the UN number for hexaethyl tetraphosphate and compressed gas mixtures. It is classed in Division 2.3 (toxic gases) of Class 2 for transport. Emergency responders use ERG guide 123.

Emergency response

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

  • Guide123Hexaethyl tetraphosphate and compressed gas mixtureHighlighted 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 1612
Name
Hexaethyl tetraphosphate and compressed gas mixtures
Hazard class
Class 2: Gases
Division
2.3: Toxic gases
What the class covers
Gases known or presumed to be toxic or corrosive to humans.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN1612Hexaethyl tetraphosphate and compressed gas mixtures

    Special provisions: 3

    Class
    2.3
    Packing group
    None
    Labels
    2.3

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 2

Class 2 covers gases, whether compressed, liquefied, dissolved under pressure or refrigerated. Division 2.1 is flammable gases such as propane, 2.2 is non-flammable, non-toxic gases such as nitrogen, and 2.3 is toxic gases such as chlorine.

See all Class 2 UN numbers

Check the official sources

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