Polyester Mylar and polyimide (Kapton) tapes for transformers, motors, capacitors, batteries, coils, power supplies and high-temperature electrical insulation.
These tapes sit between conductors, or between a conductor and a metal part, to hold voltage back and to keep a winding in place. Typical places they are used: layer insulation and interleaving in transformers, slot and phase insulation in motors, wrapping on coils and solenoids, insulation inside capacitors and power supplies, and barrier or tab insulation in battery packs.
Polyester (Mylar) insulation tape is the general-purpose film where the part stays within moderate temperatures. Polyimide (Kapton) insulation tape is chosen where the part runs hotter or where thin insulation has to survive soldering and short-term overload. Both are commonly supplied as slit rolls for winding machines, as sheets, or as die-cut pieces for a specific slot or barrier shape.
What decides the choice
Temperature class of the design. The insulation has to match the hottest point the winding sees in service, not the average.
Thickness and dielectric requirement. Thinner film saves space in a slot. The voltage the part must hold decides whether that is acceptable.
Winding method. Machine winding, hand wrapping and insertion into a slot each need a different balance of stiffness, tack and elongation.
Impregnation and potting. Varnish, resin or potting compound has to be compatible with the tape and must not attack the adhesive.
Documents the project requires. If your customer or end market asks for specific test reports or compliance documents for the insulation, state that at enquiry stage so the correct construction and paperwork can be confirmed before the order.
Formats and converting
Common supply is a slit roll wound to the width the winding machine needs, with core size and roll length matched to the equipment. Sheet material and die-cut parts are used where the insulation is a slot liner, a barrier, a washer or a cover rather than a wrap. Adhesive on one side, adhesive on both sides, or film with no adhesive at all are all possible within this range.
What to send for a quotation
The application: transformer, motor, coil, capacitor, battery or power supply.
Working temperature and the voltage the insulation must hold.
Required thickness and width, plus roll or sheet format.
Any documentation the project requires, so it can be confirmed before ordering.
It depends on the temperature class and the space available. Polyester film is the usual choice for moderate-temperature designs where thickness is not critical. Polyimide is used where the winding runs hotter or the insulation must be thinner for the same duty. Compare both against the actual temperature the winding reaches.
Can the tape be supplied in slit rolls for a winding machine?
Yes. Slit rolls can be produced to the width, core size and roll length the machine accepts, which is the normal format for coil and transformer winding.
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Inquiry type: Quotation request
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