... Smooth.tough.mechanical and electric intensity Electrical insulating paper Model: P.4.1 Standard: IEC641 - 3 - 2 Density: 1.0 - 1 ... of dielectric, mechnical, smooth and tough, they are widely used in the fields of transformer, engines, power cable, electrical ... appliance and instruments as insulating material, and also used to make polyester film/Kraft paper flexible laminate, electrical ...