UNunnums
1403

UN 1403Calcium cyanamide with more than 0.1 percent of calcium carbide

Division 4.3

Dangerous when wet

Summary

UN 1403 is the UN number for calcium cyanamide with more than 0.1 percent of calcium carbide. It is classed in Division 4.3 (dangerous when wet) of Class 4 for transport. Packing group III. Emergency responders use ERG guide 138.

Emergency response

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

  • Guide138Calcium cyanamide, with more than 0.1% calcium carbide

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 1403
Name
Calcium cyanamide with more than 0.1 percent of calcium carbide
Hazard class
Class 4: Flammable solids
Division
4.3: Dangerous when wet
Packing group
III
What the class covers
Substances which, in contact with water, emit flammable gases.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN1403Calcium cyanamide

    with more than 0.1 percent of calcium carbide

    Special provisions: A1, A19, IB8, IP4, T1, TP33, W31

    Class
    4.3
    Packing group
    III
    Labels
    4.3

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 4

Class 4 covers flammable solids and other substances that can catch fire. Division 4.1 is flammable solids and self-reactive substances, 4.2 is substances that can spontaneously combust in air, and 4.3 is substances that give off flammable gas when wet.

See all Class 4 UN numbers

Check the official sources

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