UNunnums
2880

UN 2880Calcium hypochlorite, hydrated or Calcium hypochlorite, hydrated mixtures, with not less than 5.5 percent but not more than 10 percent water

Division 5.1

Oxidizing substances

Summary

UN 2880 is the UN number for calcium hypochlorite, hydrated or Calcium hypochlorite, hydrated mixtures, with not less than 5.5 percent but not more than 10 percent water. It is classed in Division 5.1 (oxidizing substances) of Class 5 for transport. Packing group II or III, depending on the form. Emergency responders use ERG guide 140.

Emergency response

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

  • Guide140Calcium hypochlorite, hydrated, with not less than 5.5% but not more than 16% waterCalcium hypochlorite, hydrated mixture, with not less than 5.5% but not more than 16% water

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 2880
Name
Calcium hypochlorite, hydrated or Calcium hypochlorite, hydrated mixtures, with not less than 5.5 percent but not more than 10 percent water
Hazard class
Class 5: Oxidizers and organic peroxides
Division
5.1: Oxidizing substances
Packing group
II, III
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

2 entries share this number in 49 CFR 172.101, by name, packing group or where the shipment is going.

  • UN2880Calcium hypochlorite, hydrated or Calcium hypochlorite, hydrated mixture

    with not less than 5.5% but not more than 16% water

    Special provisions: 165, IB8, IP2, IP4, IP13, W9

    Class
    5.1
    Packing group
    II
    Labels
    5.1

  • UN2880Calcium hypochlorite, hydrated or Calcium hypochlorite, hydrated mixture

    with not less than 5.5% but not more than 16% water

    Special provisions: 165, 171, IB8, IP4, IP13, W9

    Class
    5.1
    Packing group
    III
    Labels
    5.1

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: