UNunnums
3499

UN 3499Capacitor, electric double layer (with an energy storage capacity greater than 0.3 Wh)

Class 9

Miscellaneous dangerous goods

Summary

UN 3499 is the UN number for capacitor, electric double layer (with an energy storage capacity greater than 0.3 Wh). It is classed in Class 9 (miscellaneous dangerous goods) for transport. Emergency responders use ERG guide 171.

Emergency response

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

  • Guide171Capacitor, electric double layer

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 3499
Name
Capacitor, electric double layer (with an energy storage capacity greater than 0.3 Wh)
Hazard class
Class 9: Miscellaneous dangerous goods
What the class covers
Substances and articles which present a hazard during transport not covered by other classes, such as lithium batteries and environmentally hazardous substances.

U.S. Hazardous Materials Table

The entry for this number in 49 CFR 172.101.

  • UN3499Capacitor, electric double layer

    with an energy storage capacity greater than 0.3 Wh

    Special provisions: 361

    Class
    9
    Packing group
    None
    Labels
    9

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 9

Class 9 covers dangerous goods that don't fit any other class, including lithium batteries, dry ice, environmentally hazardous substances, elevated-temperature materials and magnetized material.

See all Class 9 UN numbers

Check the official sources

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