PET Film Electrical Insulation

PET Film Supply Company manufactures PET Film Electrical Insulation for motors, transformers, coils, electrical tapes, battery insulation pads, and electronic insulation parts. As a manufacturer of electrical grade PET film, we make this film for insulation structures that require stable dielectric strength, clean slit edges, controlled thickness, and reliable shrinkage. It is supplied in rolls, slit rolls, sheets, strips, or die-cut pieces for slot liners, interturn insulation, coil barriers, and precision assemblies.

Product Overview

This polyester insulation film is used where a thin dielectric layer must separate conductive parts without adding much thickness. After slitting, folding, winding, laminating, or die cutting, the film still needs to keep insulation strength and dimensional stability. In motor slots, it should enter narrow spaces without edge cracking, burr dust, or folding marks. In transformer coils, it should stay flat between winding layers and resist shrinkage under heat and voltage stress.

PET Film Supply Company controls film gauge, surface defects, roll tension, and slit-edge quality. Burrs, dust, pinholes, gel spots, black spots, or uneven thickness may increase leakage current risk or reduce breakdown margin. For common batches, thickness tolerance can be controlled around ±3%, and slit width tolerance can normally reach within ±0.2 mm for many roll widths. This electrical grade PET film can also be used with flame retardant PET film or heat resistant polyester film when flame behavior, thermal class, dielectric strength, heat shrinkage, and coating compatibility need to be checked together.

Benefits

• Reliable dielectric barrier:Approx. 180–250 kV/mm dielectric strength helps reduce short circuit, leakage current, and breakdown risk.
• Stable gauge:Thickness tolerance around ±3% supports predictable breakdown voltage and cleaner die-cut parts.
• Good strength:Approx. 150–220 MPa tensile strength and 80–130% elongation help resist tearing, folding, winding pressure, and slot insertion.
• Controlled shrinkage:Typical MD ≤1.5% and TD ≤0.8% after 150°C × 30 min, depending on thickness and grade.
• Cleaner converting:Smooth slit edges, stable roll tension, and low dust help reduce scratches, wrinkles, and misalignment.
• Practical thickness choice:Thin film fits compact coils and narrow slots; thick film improves puncture resistance and insulation margin.

How does PET Film Electrical Insulation improve motor and transformer safety?

PET Film Electrical Insulation works as a stable dielectric layer between conductive areas. In motors, it is used as slot liner, phase insulation, wedge insulation, or interturn insulation, where the material must handle bending, insertion pressure, and edge friction. In transformers, it separates coil layers and keeps the winding structure compact. Reliable insulation depends on more than high voltage resistance alone. Edge cleanliness, thickness tolerance, pinhole control, shrinkage, and stability after folding, slitting, and winding are also important.

TDS

Applications

• Motor slot insulation film:Slot liner, slot separator, wedge insulation, and phase insulation where clean insertion matters.
• Transformer insulation film:Layer insulation, coil barrier, winding separator, and insulation gasket where flatness and shrinkage control matter.
• Electrical coils:Winding layer separation without too much build-up thickness.
• Insulating tapes:PET electrical insulation tape after adhesive coating or lamination.
• Battery electrical insulation:Cell spacing, pack insulation pads, and dielectric protection layers.
• Wire and cable systems:Wrapping, barrier film, and insulation layer conversion.
• Electronic parts:Membrane switches, flexible circuits, sensors, and die-cut spacers.

What should be checked before selecting PET film for electrical insulation?

Before choosing PET film for electrical insulation, confirm working voltage, film thickness, dielectric strength, thermal class, heat exposure, and converting method. Thicker film gives stronger puncture resistance and a higher insulation margin, but it may be less flexible in narrow motor slots or small transformer coils. For motor use, check slit edge smoothness, folding resistance, and burr control. For transformer use, check shrinkage, flatness, layer consistency, and long-term voltage stress. If the film will bond with paper, resin, adhesive, or flame retardant laminate, surface tension and coating compatibility should be tested before mass production.

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Loading Details

FAQ

Is PET Film Electrical Insulation suitable for motor slot liners?

Yes. It is used for motor slot liner, phase insulation, and interturn insulation when thickness, edge quality, folding resistance, and dielectric strength match the design.

What thickness is commonly used for transformer insulation?

Common options include 50, 75, 100, 125, and 188 micron, depending on voltage level, winding structure, shrinkage requirement, and insulation margin.

Can the film be supplied as die-cut insulation parts?

Yes. PET Film Supply Company supplies rolls, slit rolls, sheets, strips, or die-cut parts according to drawing, thickness, slit tolerance, flatness, and edge quality requirements.

Does this film replace flame retardant PET film?

Not always. Standard electrical grade PET film focuses on dielectric insulation. If flame resistance is required, a flame retardant PET film option or tested insulation system may be needed.