[ARC5] Disc Capacitors

[wb3fau55 at neo.rr.com]

Don't use  diameter as a rule of thumb  to determine unknown voltage rating.  There  have been
some  pretty bad dielectric materials used in past.  Ceramics and epoxies are very good.
Some plastics from  years ago not too good.  Unless it is  marked as  rated  for 500v, I would
not use it on high voltage.  73 Russ.
---- Robert  Eleazer <releazer at earthlink.net> wrote: 
> I have some .01 mfd caps that are not marked as to max voltage capability.  They are pretty good size, at least a half inch in diameter, maybe more.  I also have a bunch of .01 mfd caps that are marked "50V" and are no more than 3/16 inch in diameter.   I need some that are good for at least 500V.
> 
> Does anyone know a good rule of thumb for diameter versus voltage relative to disk caps?  Bigger means higher voltage; that follows logically, since you need more insulation, but what kind of a estimate can we make based on size?
> 
> Thanks.
> 
> Wayne     
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