1. Locate polarity in the documented construction
Polarity is more than a convenient stock-list category for aluminium electrolytic capacitors. Nichicon's general description relates it to the rectifying properties of the oxide film. The same passage explains bipolar, or nonpolar, construction using oxide films on both foils. That gives a seller a specific construction distinction to retain when an exact series is identified. It is different from deciding which end of an unknown component a photograph appears to show, and it supplies no instruction for applying voltage to unidentified material.
A shared capacitance description cannot settle that construction question. Two inventory lines can carry similar nominal-value language while referring to different documented polarity categories. Keep the series reference beside the polarity description so the recipient can follow how the category was established. If an existing record uses nonpolar and another says only electrolytic, those descriptions have different levels of detail. Preserve the supported construction without completing the less specific record from appearance or from the characteristics of another series stored nearby.
2. Preserve the limitation on AC wording
Nichicon's circuit-design guidance discusses bipolar capacitors in the context of possible reversed polarity, then expressly says they cannot be used for AC voltage application. Its later explanatory passage also excludes continuous AC application for bipolar capacitors. Preserve that limitation when describing the construction. The word nonpolar should not be expanded into a broad AC-capacitor category, a proposed circuit use or permission to demonstrate the component by applying alternating voltage. Those would answer a different question from identifying the product offered.
This distinction matters when a former equipment description has become a warehouse nickname. A record saying AC service could refer to a larger circuit or to an earlier owner's shorthand; it is not an independent manufacturer application approval. Keep such history as context alongside the exact capacitor reference. Where a recipient needs an application decision, the appropriate exact-product requirements remain necessary. The classification here supplies neither a reverse-voltage experiment nor an operating recommendation, and it does not turn the absence of a polarity mark into evidence of unrestricted use.
3. Keep electrolyte category and endurance independent
Polarity construction and electrolyte construction describe different aspects of a capacitor. The existing wet, polymer and hybrid guide concerns what electrolyte category the applicable product reference identifies. This article asks about the documented polarity construction. One description should not silently fill the other: a broad aluminium-electrolytic entry can still leave either question unresolved. Retaining both at their supported level is more informative than replacing them with a single general-purpose capacitor label that hides which technical distinction has actually been established.
Endurance and storage records address another layer. A construction description explains the product represented by the code; it is not a current leakage result or a prediction of usable life. The existing storage-and-endurance article preserves the difference between operating-test context and warehouse history. Keep that discussion with its own evidence rather than importing a shelf-life judgement into the polarity field. Known construction can remain useful identification even when a particular lot has no available electrical report, provided no condition result is implied by the label.
4. Retain meaningful polarity groups in the offer
When supported series records distinguish polarised and nonpolar products, keep those groups distinguishable even if an older inventory system combines them by nominal value. The useful technical result is preserving the construction difference that would otherwise disappear in a value-only list. Keep the original source terminology where abbreviated labels could be confusing. Do not relabel all capacitors from a shared programme as bipolar merely because one identifiable group has that construction, and do not merge unresolved items into an identified nonpolar group to simplify the offer.
For an ICULTRA review, provide the exact identities and the supported polarity descriptions, with the manufacturer's limitation retained where nonpolar wording could be misunderstood. Wider packing and quantity details belong in the general stock list. Explain whether a history statement concerns the component or the equipment it came from, and keep any existing electrical report within its own coverage. This preparation does not energise, treat or test the material. It identifies a narrower technical question for review without promising application suitability, remaining life or acceptance.
Sources and further reading
Nichicon's bounded oxide-film/bipolar text and explicit AC limitations support this qualitative construction distinction. No reverse-voltage test, treatment, life calculation, numerical rating or application approval is provided.