What does EKR(ROE) mean in capacitor markings?
Like Leon said, EKR devices were made by Roederstein. But I also found them at Frolyt, a manufacturer I never heard of before, frankly.
This datasheet suggests that it's a series of low-impedance elcos, which indeed is what you want for SMPSs. Other than that the document doesn't mention what EKR means, materials-wise or process-wise.