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2949

UN 2949Sodium hydrosulfide, with not less than 25 percent water of crystallization

Class 8

Corrosives

Summary

UN 2949 is the UN number for sodium hydrosulfide, with not less than 25 percent water of crystallization. It is classed in Class 8 (corrosives) for transport. Packing group II. Emergency responders use ERG guide 154.

Emergency response

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

  • Guide154Sodium hydrosulfide, hydrated, with not less than 25% water of crystallizationSodium hydrosulfide, with not less than 25% water of crystallizationSodium hydrosulphide, hydrated, with not less than 25% water of crystallizationSodium hydrosulphide, with not less than 25% water of crystallization

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 2949
Name
Sodium hydrosulfide, with not less than 25 percent water of crystallization
Hazard class
Class 8: Corrosives
Packing group
II
What the class covers
Substances which can damage living tissue or other goods and materials on contact.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN2949Sodium hydrosulfide

    with not less than 25 percent water of crystallization

    Special provisions: A7, IB8, IP2, IP4, T7, TP2

    Class
    8
    Packing group
    II
    Labels
    8

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: