Coating
    The cores are coated with epoxy, flame retardant in
    accordance with “UL 94V-0”; UL file number E 228348.
    The colour is white.
    Maximum operating temperature is 200 °C.

Isolation voltage
    DC isolation voltage: 2000 V.
    Contacts are applied on the edge of the ring core, which is
    also the critical point for the winding operation.