Pre compressed Press Board,insulating cardboard ,Transformer insulating paper board ,Electrical Insulation paper ,Transformer Pressboard,  Laminated Pressboard, Transformer insulating paper board, Pre-compressed pressboard is used in windings as opposed to the softer materials used in earlier days. The major insulation ( between windings, between windings and yoke, etc.) consists of a number of oil ducts formed by suitably spaced insulating cylinders / barriers. Well profiled angle rings, angle caps and other special insulation components are also used competitive quote in china.