UNunnums
1051

UN 1051Hydrogen cyanide, stabilized with less than 3 percent water

Division 6.1

Toxic substances

Summary

UN 1051 is the UN number for hydrogen cyanide, stabilized with less than 3 percent water. It is classed in Division 6.1 (toxic substances) of Class 6 for transport. Packing group I. Emergency responders use ERG guide 117P.

Emergency response

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

  • Guide117PHydrogen cyanide, stabilizedHighlighted 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.

A “P” after the guide number means the material may suffer a violent polymerization.

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 1051
Name
Hydrogen cyanide, stabilized with less than 3 percent water
Hazard class
Class 6: Toxic and infectious substances
Division
6.1: Toxic substances
Packing group
I
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

The entry for this number in 49 CFR 172.101.

  • UN1051Hydrogen cyanide, stabilized

    with less than 3 percent water

    Special provisions: 1, 387, B35, B61, B65, B77, B82

    Class
    6.1
    Packing group
    I
    Labels
    6.1, 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 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: