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2741

UN 2741Barium hypochlorite with more than 22 percent available chlorine

Division 5.1

Oxidizing substances

Summary

UN 2741 is the UN number for barium hypochlorite with more than 22 percent available chlorine. It is classed in Division 5.1 (oxidizing substances) of Class 5 for transport. Packing group II. Emergency responders use ERG guide 141.

Emergency response

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

  • Guide141Barium hypochlorite, with more than 22% available chlorine

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 2741
Name
Barium hypochlorite with more than 22 percent available chlorine
Hazard class
Class 5: Oxidizers and organic peroxides
Division
5.1: Oxidizing substances
Packing group
II
What the class covers
Substances which may cause or contribute to the combustion of other material, generally by yielding oxygen.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN2741Barium hypochlorite

    with more than 22 percent available chlorine

    Special provisions: A7, A9, IB8, IP2, IP4, N34, T3, TP33

    Class
    5.1
    Packing group
    II
    Labels
    5.1, 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 5

Class 5 covers substances that supply oxygen or otherwise intensify a fire. Division 5.1 is oxidizers such as ammonium nitrate and hydrogen peroxide; 5.2 is organic peroxides, which may also be thermally unstable.

See all Class 5 UN numbers

Check the official sources

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