Many of the exotic dielectrics do not provide a DC rating; they are expected to be used only in an AC circuit.....datasheet doesnt say.
The document is confusing at best. Some samples:As VICOR white paper explains...
I don't recommend such a test.If my question I'd buy samples from different manufacturers and test.
I presume what is called leakage current is actually the reactive current; else we should see a linear part in the curve.Leakage currents graph: all caps have a parallel resistance, for
2.2nF and 500Vac I_leak expected below approx. 300uA.
It is entirely possible that a high voltage (very little current) can crack the dielectric and can cause the capacitor to fail; the capacitor can fail without being overheated or any symptom of burning. A crack can severely reduce the effective voltage rating of the capacitor. In fact, most of the exotic dielectrics used in these capacitors experience considerable stress while under a DC voltage.The so called XY safety ratings standard is just a half-way job because Voltages alone do not overheat or burn things: It’s a combination of enough Voltage and enough current, Amperes burn things.