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Rag Paper – Electrical grade rag papers are made from cotton fibers by a process expressly designed to produce a high density, uniform sheet. Because of their high density, these papers have excellent tear resistance and good electric strength. Electrical grade rag papers are available in gauges from .004" through .025".

Fish Paper- Fish paper is made from high quality rag paper by a chemical process using zinc chloride. It has a harder surface and is stiffer than ordinary rag paper. Fish paper has excellent forming qualities and good electric strength. It is available in gauges from .004" to .030".

Kraft Paper – Kraft is a low cost electrical paper made from wood pulp.

It is used in applications where high mechanical strength is not required.

Paper/Polyester Film – These composites are available in both two ply and three ply combinations. For general purpose applications, the composites are bonded with adhesives which have good solvent resistance and heat stability. For hermetic motors, the constructions are bonded with adhesives formulated to resist the effects of refrigerants.

Two ply combinations are normally used in small units where the optimum in space savings is desired. Three ply combinations of the paper/film/paper type are used in larger units where mechanical protection of the film is important and space is not critical. Three ply constructions of the film/paper/film type are used in specialized applications where moisture resistance and surface resistivity is of prime importance.