Abstract: Provided is a covering material, in which the covering material is a covering material for covering a superconducting wire, a tensile strength at break thereof at ?196° C. is 12.0 N/3 mm or more, and a tensile elongation at break thereof at ?196° C. is 12% or more. The covering material preferably includes a backing made of a polyimide resin. The covering material preferably includes a viscoelastic layer formed on one surface of the backing.

Abstract: The covering material for a rectangular electric wire of the present invention is a covering adhesive tape for covering a rectangular electric wire, wherein a viscoelastic material layer is disposed on one side of the backing of the covering material. In particular, in the covering material for a rectangular electric wire of the present invention, the viscoelastic material layer preferably includes a silicone-based adhesive agent composition, and the backing preferably includes a polyimide resin.

Abstract: Provided is a covering material, which includes a backing having an upper surface and a lower surface opposite to the upper surface, and a viscoelastic layer formed on the upper surface of the backing, in which the covering material is a covering material for covering a rectangular electric wire, and an adhesive force of the viscoelastic layer to the lower surface of the backing as measured by peeling at a peeling angle of 180° and a tensile rate of 300 mm/min is 0.05 N/20 mm or more and 10 N/20 mm or less. A covered rectangular electric wire includes the covering material and a rectangular electric wire covered with the covering material. An electrical device is produced by using the covered rectangular electric wire.