This is clearly not true for any electrolytic capacitor thats been crafted to not care about the polarity. Bipolar capacitors on the other hand use a different dielectric that allows charging in both directions.

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Both foils have had oxide grown on them to resist voltage.

Electrolytic capacitor bipolar. As a result an electrolytic capacitor can only be charged in one direction. Rare is the case where high values of capacitance are needed and they must be non polarized. Yes you can play around with biasing the pins and stuff but the end result is you are still running audio through a lossy cap or two.
A 407 6pcs ncc nippon chemi con sme radial electrolytic capacitor 10uf 100v bp np bipolar non polarized d 3. All electrolytic bipolar caps are really two caps insides connected in series. Unfortunately the chemical paste used in the electrolytics insulator.
Bipolar aluminum electrolytic capacitors radial leaded are available at mouser electronics. This becomes significant for larger values typically used in power supplies and loudspeakers. As such the losses are double for that of a polarized cap.
Mundorf ecap ac 470uf 63v bipolar electrolytic capacitor raw 445 mundorf ecap ac 47uf 70v bipolar electrolytic capacitor plain 520 mundorf ecap ac 56uf 70v bipolar electrolytic capacitor plain 163 mundorf ecap ac 560uf 63v bipolar electrolytic capacitor raw 520 mundorf ecap ac 56uf 100v. Capacitance polarized capacitors are not a problem. This oxide layer acts as the dielectric of the capacitor.
Either they are filtering power supply lines where they are seeing pretty much a single polarity signal or they are carrying ac where one terminal is clearly more positive than the other. Mouser offers inventory pricing datasheets for bipolar aluminum electrolytic capacitors radial leaded. Bipolar implying two polarities is more fitting because thats how a bipolar electro cap is made.
No different than doing it yourself with a pair of polarized caps. Electrolytic and nonpolar electrolytic capacitors rg electrolytics are smaller than the other types for a given value of capacitance. An electrolytic capacitor occasionally abbreviated e cap is a polarized capacitor whose anode or positive plate is made of a metal that forms an insulating oxide layer through anodization.

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