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Datasheet of these capacitors (Panasonic FK series -- surface mount) does not say anything about it (https://industrial.panasonic.com/cdbs/www-data/pdf/RDE0000/ABA0000C1181.pdf). For reliability assessment, I need to know whether they are solid or non-solid electrolyte.

Is there some way to tell, either from the parameters, shape/look, etc.?

I know I can ask Panasonic, but my experience (with manufacturers in general, not necessarily Panasonic specifically) is that in the best case, it will take ages to get an answer from them.

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    \$\begingroup\$ Would you like to share the link to the datasheet with us? \$\endgroup\$
    – brhans
    Jun 9, 2018 at 14:43
  • \$\begingroup\$ Does it have a breather hole? \$\endgroup\$
    – Andy aka
    Jun 9, 2018 at 14:45
  • \$\begingroup\$ @brhans -- I edited the post to include the link \$\endgroup\$
    – Cal-linux
    Jun 9, 2018 at 14:54
  • \$\begingroup\$ @Andyaka -- I don't have one with me, but I can ask some of my colleagues to check. Can you specify what the rule is? (does breather hole mean solid, or non-solid?) \$\endgroup\$
    – Cal-linux
    Jun 9, 2018 at 14:58
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    \$\begingroup\$ Has to be standard al elect based on name and impedance ratio from cold to room temp. \$\endgroup\$
    – Zekhariah
    Jun 9, 2018 at 15:00

3 Answers 3

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Panasonic calls their solid-electrolyte capacitors "Conductive Polymer Electrolytic". All "Aluminum Electrolytic" as well as "Conductive Polymer Hybrid Aluminum Electrolytic" capacitors contain liquid electrolyte.

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Page one of the datasheet mentions a 'pressure relief' in the 'dimensions' section. So my guess is it's a liquid electrolyte.

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Yes, Solid and Non-solid electrolytic capacitors can be differentiated with there shapes (by looking at images in datasheets). Shared below is the link that describes the shapes.

https://en.wikipedia.org/wiki/Aluminum_electrolytic_capacitor

Look at the "Polarity Marking" section, under "Additional Information" block that is written at the last few pages in the above link.

Note: Aluminum electrolytic capacitors with non-solid electrolyte have a polarity marking at the cathode (minus) side. Aluminum electrolytic capacitors with solid electrolyte have a polarity marking at the anode (plus) side.

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