Specification for plastic films for electrical purposes. Specifications for individual materials. Requirements for balanced biaxially oriented polyethylene terephthalate (PET) films used for electrical insulation|Dissipation factor, Density, Film splices, Thermal testing, Dielectric strength, Electrical testing, Polyethylene terephthalate, Corrosion resistance, Plastic films, Plastics, Tensile strength, Deformation, Thermal resistance, Insulating films, Dielectric materials, Permittivity, Designations, Electrical resistivity, Electrical insulating materials, Width, Breakdown voltage, Solid electrical insulating materials, Grades (quality), Defects, Endurance testing, Dimensional changes, Sag (deformation), Diameter, Thickness, Elongation at fracture