[ARC5] Disc Capacitors

[Robert Eleazer]

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