UNunnums
1790

UN 1790Hydrofluoric acid, with more than 60 percent strength or Hydrofluoric acid, with not more than 60 percent strength

Class 8

Corrosives

Summary

UN 1790 is the UN number for hydrofluoric acid, with more than 60 percent strength or Hydrofluoric acid, with not more than 60 percent strength. It is classed in Class 8 (corrosives) for transport. Packing group I or II, depending on the form. Emergency responders use ERG guide 157.

Emergency response

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

  • Guide157Hydrofluoric acid

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 1790
Name
Hydrofluoric acid, with more than 60 percent strength or Hydrofluoric acid, with not more than 60 percent strength
Hazard class
Class 8: Corrosives
Packing group
I, II
What the class covers
Substances which can damage living tissue or other goods and materials on contact.

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.

  • UN1790Hydrofluoric acid

    with more than 60 percent strength

    Special provisions: A7, B4, B15, B23, N5, N34, T10, TP2, TP13

    Class
    8
    Packing group
    I
    Labels
    8, 6.1

  • UN1790Hydrofluoric acid

    with not more than 60 percent strength

    Special provisions: A7, B15, IB2, N5, N34, T8, TP2

    Class
    8
    Packing group
    II
    Labels
    8, 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 8

Class 8 covers corrosive substances such as acids, alkalis and battery fluid, which can destroy skin or corrode metal on contact.

See all Class 8 UN numbers

Check the official sources

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