Ron Rich wrote:Gotta dis-agree here--"paper" type do "age" ! Ron Rich
Depends on how they were made and used.
If the paper is acid-free, sealed from any external attacks, not overheated, and not subjected to overvoltage, it lasts forever.
Paper washed in acid slowly deteriorates.
If the seal is less than perfect, the paper oxidizes.
If the sealant is wax and it is allowed to overheat and soak into the paper, the value and maximum voltage changes.
If the capacitor is overheated to the point where it affects the paper, the capacitor can short.
If the leads were overheated when the capacitor was installed, the paper is damaged, and the internal connection might be.






