HazMat Tool — substance information

Capacitor, electric double layer with an energy storage capacity greater than 0.3 Wh

HMT May 2026
UN / ID
UN 3499
Hazard class
9
Packing group
ERG guide
ERG 171
Special provisions
SP 361
Source
49 CFR §172 (2026/05)

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Capacitor, electric double layer with an energy storage capacity greater than 0.3 Wh


A capacitor is a device that stores electrical energy by accumulating electric charges on two closely spaced surfaces that are insulated from each other. It is a passive electronic component with two terminals. A capacitor was originally known as a condenser, a term still encountered in a few compound names, such as the condenser microphone. Colloquially, a capacitor may be called a cap. The utility of a capacitor depends on its capacitance. Wikipedia

Emergency Response Guide No. 171

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

9
Miscellaneous hazardous materials

(4) Identification number Help

UN 3499

(5) Packing Group Help

n/a

(6) Labels Help

Miscellaneous hazardous materials (9)

(7) Special Provisions (§172.102) Help

×Note:
Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs.
361

(8) Packing Authorizations (§173.***) Help

(8A) Exceptions176see 49 CFR §173.176
(8B) Non-bulk176see 49 CFR §173.176
(8C) Bulk176see 49 CFR §173.176

(9) Quantity Limits Help

(9A) Passenger aircraft/railNo limit
(9B) Cargo aircraft onlyNo limit

(10) Vessel stowage Help

(10A) Location
(10B) Other n/a

Segregation chart for load, transport, and storage

This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.

No compatibility information for class 9 in 49 CFR §177.848 included.

Scope & sources (important)Click to show CFR references

This check evaluates segregation per 49 CFR §177.848. Additional loading/unloading and handling requirements may still apply; see 49 CFR §177 Subpart B (Loading and Unloading):

  • §177.834 - General requirements
  • §177.835 - Class 1 materials
  • §177.837 - Class 3 materials
  • §177.838 - Class 4 (flammable solid) materials, Class 5 (oxidizing) materials, and Division 4.2 (pyroforic liquid) materials
  • §177.839 - Class 8 (corrosive) materials
  • §177.840 - Class 2 (gases) materials
  • §177.841 - Division 6.1 and Division 2.3 materials
  • §177.842 - Class 7 (radioactive) material
  • §177.843 - Contamination of vehicles

Similar substances

UN / IDProper shipping nameHazard class
UN 3508Capacitor, asymmetric with an energy storage capacity greater than 0.3 Wh9