Vulcanized Fibre/Polyester Film Composite 190

This composite offers the forming and mechanical properties of vulcanized fibre with the excellent electrical properties of polyester film. The composite is obtained in rolls and can be converted into other forms. Polyester film can be applied to one or both sides. It can also be placed between 2 plys of vulcanized fibre. The union of vulcanized fibre with polyester film results in higher dielectric strength, tear strength, and bursting strength when compared to standard vulcanized fibre. Polyester film will also act as a moisture barrier in applications where standard vulcanized fibre is too sensitive to moisture.
Recommended for use as slot insulation where vulcanized fibre is shaped to fit the slot and acts as a backer for poly-ester film. In this application, vulcanized fibre adds the required stiffness or rigidity to allow the wedge to be properly inserted.

Thickness Range
Vulcanized Fibre: 0.005" to 0.020"
Polyester Film: 0.001" and 0.002"

Sheet, Roll and Coil

Property Unit ASTM Typical Value
Vulcanized Fibre Thickness in D-374 0.010 0.010 0.020
Polyester Film Thickness in D-374 0.001 0.002 0.002
Tensile Strength


psi D-828 17,000 16,000 21,000


psi D-828 10,000 11,000 12,000
Bursting Strength, Mullen psi D-202 230 300 390
Tear Strength, Elmendorf          


gm D-689 370 670 770


gm D-689 410 690 890
Dielectric Strength volts/mil D-149 700 900 760
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