There have been many posts here about Rifa safety capacitors (usually class X, I believe) that have failed in commercial equipment, either discrete components or included in mains-input line filter modules.
I own some test equipment from the era in question (such as -hp-), but have yet to suffer this problem (knock on wood).
In the US, of course, my capacitors have been exposed to only 120 V, but the equipment is designed to apply either 120 or 240 V to the components in question, depending on country.
Obviously, the stress on an individual capacitor is worse at 240 V than at 120 V.
In the actual experience of the members here, is this problem much more prevalent in 240 V countries?