Crepe paper 

 Insulation crease paper is one of the most important
  solid insulation of the transformer's oil-paper insulation
  system .
 Characters
   Wrinkles uniformly, has no folds, breakages, and has no
   any impurity, pinhole, water trace and clump. The pruning
   edges should be orderly and thickness should be uniform.

 Applications:
   The product applies to insulation crease paper, which is
   used to oil immersion transformer
 Thickness: base cable paper 0.05mm ,0.08mm ,0.13mm
   Width: 625mm or tapes.