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Moisture resistance of aluminum electrolytic capacitors

Placing an aluminum electrolytic capacitor in high-temperature, high-humidity conditions could cause a moisture incursion from the seal into the inside of the capacitor. This could result in withstand voltage deterioration and reduced product endurance. Condensation could cause terminal rusting or cause the deterioration of the aluminum case or the exterior sleeve.

If planning for long-term use in a high-temperature, high-humidity environment, then please consider the use of a resin coat (note) or other moisture prevention measures.

(Note) If using a resin coat, then make sure to check the precautions concerning coating agents.

As moisture resistance for our aluminum electrolytic capacitors, we guarantee compliance with the content outlined in Japanese Industrial Standards (JIS).
(Conditions will vary for conductive polymer aluminum solid capacitors and conductive polymer hybrid aluminum electrolytic capacitors. See the following table for details.)

Aluminum Electrolytic Capacitors: (JIS C 5101-1 4.22 compliant)

Series Test parameters
all series 40℃ at 90 to 95%RH: Left for 240 hours with no voltage applied

Conductive Polymer Aluminum Solid Capacitors:

Series Test parameters
PXJ/PXG/PXK/PXS/
PXF/PXD/PXH/PSW/
PSJ/PSG/PSK/PSF/PSE
60℃ at 90 to 95%RH: Rated voltage applied for 1,000 hours.
(Size code: 500 hours for E40, E46, and F46)

Products compatible with 85℃ at 85%:

Series Test parameters
PXN/PXT 85℃ at 85%RH: Rated voltage applied for 1,000 hours.
HXF/HXE/HXJ/HXC/
HXD/HSE/HSC/HSD
85℃ at 85%RH: Rated voltage applied for 2,000 hours.
*We may be able to provide test data for certain automotive products not included above.

Please note that there is a high possibility of a malfunction in extreme environments of high heat and humidity (100℃ and above with high humidity), such as the environment created during a pressure cooker test (PC test). As such, these products are not compatible with such uses.

If you have any questions or inquiries that do not apply to the above, please contact us at the following address.

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