Abstract: A bushing for a transformer is provided, the bushing comprising an elongate enclosure body to accommodate a conductor extending along a longitudinal axis, the conductor having a first terminal end a second terminal end, the ends extending from opposite sides of the enclosure body; and a mounting flange fitted to the enclosure body to enable the bushing to be mounted to an enclosure of the transformer. The enclosure body comprises two electrically insulating layers partially surrounding the conductor, a first layer of the insulating layers being substantially provided by a first polymeric material and a second layer of the insulating layers being substantially provided by a second polymeric material, the layers being arranged about the conductor in such a manner that the bushing is substantially cavity-free. In an embodiment, the first layer defines an inner core, with the second layer providing an outer cover which at least partially covers the inner core.