A circuit board was burned-in before product released, for some reasons, a component on it was replaced by a new one. Just to add some background info to the question 4 previous to this one. Two capacitors have been stored in the same general location. One energised and one not.
Testing reveals correct capacitance and insulation resistance.
The main information required is 1 What is likely to be causing this expansion of the capacitor walls. How can the extent of any degradation be tested for. How to determine when they need to be put out of service. I am interested in ordering the Electric reliability, nonelectric reliability and failure mode distribution cd's. However, I noticed that the publication dates are 1997 and 1998.