MGC Moser Glaser, the well-known Swiss company, invented the resin impregnated paper (RIP) technology in 1958 – a process that is designed to insulate electrical conductors for bushings and busbars for HV and MV applications. The insulation lies directly on the aluminium or copper conductor and consists of wrapped paper dried under vacuum and impregnated with epoxy resin.

Conductive grading layers are embedded in the insulation during the wrapping process to provide field control. The RIP technology provides an oil free/dry type bushing that can be created in short lengths for transformer and wall bushing applications, or up to 10m lengths for busbar systems.