That would make sense too, since the coefficient of expansion for the alumi= num can is greater than the plastic or rubber base, which might even soften= slightly or deform rather than unglue if it was a crimp or friction fit. Dr Skip On February 26, 2018 12:56:30 PM EST, "Isaac M. Bavaresco" wrote: >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 series 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 there, 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 instead 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 mistake putting the cap in wrong, but if I'd used a quality cap >perhaps I'd have only been startled with a scary hiss instead of a >projectile. Take heed! How many lives do you really have? >>> >>> Cheerful regards, >>> >>> Bob >>> >>> >>> >>> > >--=20 >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .