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Why there is an air vent structure on the rubber seal of radial lead-type capacitors.

Radial lead-type aluminum electrolytic capacitors are designed based on the assumption of mounting via adhesion to the printed substrate. (excludes cases of purposely leaving space open for terminal processing, etc.)
The majority of series of radial lead-type aluminum electrolytic capacitors are designed with concave and convex sections of the rubber seal. This is known as an air vent structure.
Fig.1 Air vent structure on the rubber seal

Fig.1 Air vent structure on the rubber seal

  • Purpose of the air vent structure
    Comprising an air vent structure enables ease of ventilation for air existing between the printed substrate and the rubber seal during soldering. This has the benefit of reducing declines in solderability caused by the thermal expansion of air.
    Fig.2 Flow of air when there is no air vent structure

    Fig.2 Flow of air when there is no air vent structure

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