I never noticed any glue in the caps I have disassembled when I was a
kid. They seemed to be sealed by pressure of the waist in the metal can
around the rubber stopper.

Cheers,

Isaac



Em 26/02/2018 02:08, DrSkip escreveu:
> I suspect the X is initially weaker than the glue holding the can on, so
> rapid pressure increase will break open there. Perhaps over the 30
> minutes heat weakened the glue to the point of it being the weak point
> for a gradual pressure buildup.
>
> Dr Skip
>
>
> On 02/25/2018 08:36 PM, Bob Blick wrote:
>> By mistake I put an electrolytic capacitor in backwards. A very generic =
100uF, 50V cap exposed to 16V with the equivalent of about 700 ohms in seri=
es with it. It lasted about 30 minutes, then went off with a bang. You can =
maybe see the damaged heatshrink where the can hit an immovable object.
>>
>> Please note the scored cross on the top of the can. Isn't that supposed =
to split and protect me from its rapid self-disassembly? Yes, I was right t=
here, close at hand, trying to figure out why all the voltages were wrong. =
Perhaps their die for the venting "X" was worn out after 20 million caps. I=
 guess that's what I get when I pay USD 0.03 for caps off of Aliexpress ins=
tead of USD 0.11 at Digi-Key :)
>>
>> I guess I learned a lesson in false economy today. I didn't lose an eye,=
 but I'm going to change my buying habits a little. Obviously I made a mist=
ake putting the cap in wrong, but if I'd used a quality cap perhaps I'd hav=
e only been startled with a scary hiss instead of a projectile. Take heed! =
How many lives do you really have?
>>
>> Cheerful regards,
>>
>> Bob
>>
>>
>>
>>

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