Author Topic: Electrolytics with organic (non water) electrolytes  (Read 514 times)

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Offline dom0Topic starter

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Electrolytics with organic (non water) electrolytes
« on: November 04, 2019, 09:41:42 pm »
Here's what I think I learned so far:

- Water-based electrolytes give you higher CV, lower ESR
- Water-based electrolytes are chemically aggressive (ie corrosive)

So essentially all 85 °C and 105 °C (boiling point of the water-based electrolyte has to be higher than 100 °C?) capacitors use water-based electrolytes. Old capacitors (pre-mid80s) use electrolytes based on organic solvents like GBL.

Organic electrolytes are chemically not nearly as aggressive, but result in lower CV, so poorer density.

Now, from a hobbyist's "I want stuff to last" perspective non-water electros seem to be the better choice. But they seem to be relatively rare. However, it seems like 125 °C and higher capacitors cannot be made using water-based electrolytes. For example, the Rifa/Kemet PEG124 series use GBL electrolyte. They don't advertise it, but this paper confirms it. These capacitors would seem like a perfect fit to replace wet slug tantalums sometimes found in older test gear, among other things.

=> Are organic electrolytes truly superior in terms of reliability than water-based electrolytes?
=> Which are commonly available cap series using organic electrolytes?
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