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From: John R Walliker <jrwalliker@gmail.com>
Newsgroups: sci.electronics.design
Subject: Re: heating a cap
Date: Fri, 4 Oct 2024 19:15:14 +0100
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On 04/10/2024 18:00, Cursitor Doom wrote:
> On Thu, 03 Oct 2024 16:36:24 -0700, john larkin <jl@glen--canyon.com>
> wrote:
> 
>> I got a small (under 1" long) aluminum electro cap, 220 uF 63v, and
>> cranked up the voltage. It started drawing a bunch of current at 105
>> volts, got hot, and folded back to 80 mA at 87v.
>>
>> It got too hot to touch in a couple of minutes, after roughly 500
>> joules. Freeze spray let it go back up to 100 volts or so.
>>
>> None of that seemed to damage it, so an electrolytic cap sort of has a
>> built-in MOV.
> 
> That's a hell of sweeping conclusion to come to based on a test of
> just one random electrolytic!

I once tried heating a large electrolytic salvaged from a valve TV.
With a blowtorch.  The side started to bulge, then it split.
A large flame maybe 1m long emerged, coloured a brilliant green.
I was wearing safety glasses.
John