Why Polyimide Film
Polyimide film - often called Kapton®-type film in the trade (Kapton is a registered trademark of DuPont, used here for reference only) - earns its place in electronics on five properties:
Extreme heat resistance. Continuous operation at 260 °C, with short-term peak resistance up to 300 °C–350 °C - enough to survive a lead-free reflow profile intact.
Electrical insulation. High dielectric strength with excellent insulation resistance, ideal where film must isolate traces, coils, or terminations.
Zero yellowing. The film holds its colour through thermal cycling, so printed barcodes and markings stay legible after the oven.
Chemical resistance. Resists solder flux, alcohol, and common process solvents without lifting or hazing.
Thin, flexible, dimensionally stable. Available from 25 μm, it conforms to tight geometries while keeping its shape through temperature swings.
For comparison, a standard PET film system operates from -40 °C to +150 °C. Polyimide holds its mechanical and dielectric performance across a far wider thermal window, which is why it is specified wherever a reflow oven, a motor winding, or a battery pack is involved.
1. Polyimide Film in Rolls
Buy PI film the way a converter wants it: on the roll, at your width, with clean edges and consistent release.
Jumbo rolls and slit rolls
Supply in jumbo (master) rolls for in-house slitting and coating, or in slit rolls cut to your finished width. Slit rolls arrive with controlled edge quality so they feed high-speed coaters and rotary die-cutters without wandering.
Custom width, core and length
Specify the roll width, core diameter, and running length you need. Custom widths reduce your trim waste and let you load the material straight onto an existing line - no re-slitting on your side.
For tape makers, coaters and label converters
Roll stock is the right format if you coat your own adhesive, laminate your own construction, or slit down to multiple finished widths. Ask for matched release-force grades so your downstream die-cutting and auto-labelling run cleanly.
Typical keywords this section answers: polyimide film roll, PI film jumbo roll, slit polyimide film custom width, polyimide film for tape converting.
2. Die-Cut Polyimide Film - Converted to Your Drawing
If you would rather receive finished parts than run a converting line, send us your drawing and we will ship the geometry.
Send your drawing, get finished parts
Provide a DXF, PDF, or dimensioned sketch and we manufacture die-cut parts, sheets, and pre-cut shapes to those dimensions - including holes, tabs, and complex outlines that are hard to punch in-house.
Die-cut, kiss-cut, sheets and pre-cut shapes
Choose full die-cutting for separate parts, or kiss-cutting where the film stays on a carrier liner for easy pick-and-place and auto-application. Pre-cut sheets suit lab, prototype, and low-volume builds where a full roll is overkill.
Why buy converted instead of converting in-house
Converting in-house ties up a press and adds scrap. Buying finished polyimide parts shifts the setup, tooling, and tolerance risk to us, shortens your lead time on new builds, and keeps your line free for revenue work. Tolerances and material grade are agreed against your drawing before production.
3. Polyimide Adhesive Tape
When you need the film already coated and ready to apply, Weshare supplies finished polyimide tape - single- or double-sided, on silicone or acrylic adhesive.
Single-sided and double-sided PI tape
Single-sided tape suits masking and surface insulation; double-sided tape bonds and insulates in one step, for laminating and fixture work where both faces need adhesion.
High-temperature masking tape for PCB and SMT
Polyimide masking tape is the standard way to protect gold fingers, connector pads, and through-holes during wave soldering and reflow. It resists solder, flux, and the wash cycle, then peels clean without leaving adhesive residue on the board.
Silicone vs acrylic adhesive
Silicone adhesive gives the widest temperature window and the cleanest high-heat release; acrylic offers strong, economical bonding for less extreme temperatures. Specify by your peak process temperature and the surface you are masking.
Typical keywords this section answers: polyimide tape, high temperature polyimide tape, polyimide masking tape for PCB, silicone adhesive polyimide tape, single sided polyimide tape, double sided polyimide tape.
Which Supply Format Do You Need?
| Your situation | Buy this |
|---|---|
| You coat, laminate, or slit material in-house | Polyimide film in jumbo or slit rolls |
| You need a specific finished width, no re-slitting | Polyimide film in custom-width slit rolls |
| You want finished parts and do not run a press | Die-cut polyimide film to your drawing |
| You apply parts by hand or with a pick-and-place line | Kiss-cut polyimide on a carrier liner |
| You need masking or bonding straight from the roll | Finished polyimide adhesive tape |
Specifications
| Parameter | Option |
|---|---|
| Base film | Polyimide (PI) film |
| Static control | ESD-safe (anti-static) grade available for SMT and component labels |
| Film thickness | 25 μm / 50 μm (other thicknesses on request) |
| Adhesive (tape grades) | High-temperature silicone or acrylic PSA |
| Adhesive coating weight | 20–25 μm |
| Release liner (label grades) | Anti-static PET release film, light-to-medium release force |
| Continuous operating temperature | 260 °C |
| Short-term peak resistance | 300 °C – 350 °C |
| Release force grades | 3–5 g / 10–15 g / 30 g+ |
| Compliance | RoHS 2.0, REACH (SVHC), Halogen-Free |
Applications
SMT / PCB - reflow traceability labels and high-temperature masking tape for SMT fixtures and solder masking.
Motor & transformer - slot, phase, and layer insulation where PI film is used as a thin, high-temperature dielectric. (See our dedicated polyimide film for motor insulation.)
EV battery - pack insulation and cell termination where heat and electrical isolation are both critical.
Flexible electronics - carrier and cover film for flexible printed circuits.
Semiconductor & IC - wafer, microchip, and board-level labels in ESD-safe constructions.
Frequently Asked Questions
What is the best high temperature label material for SMT PCB reflow soldering? Polyimide (PI) film combined with a high-temperature-resistant acrylic or silicone adhesive is the industry standard for SMT PCB assembly. It withstands reflow peak temperatures of 260 °C to 300 °C without yellowing or falling off.
Are Weshare's industrial electronic adhesive materials RoHS and REACH compliant? Yes. All our electronic label materials, industrial tapes, and PET release liners comply with RoHS 2.0, REACH (SVHC), and Halogen-Free global standards.
Can I get polyimide film die-cut to my own drawing? Yes. Send a DXF, PDF, or dimensioned drawing and we manufacture die-cut parts, sheets, and kiss-cut shapes to those dimensions. Tolerances and material grade are confirmed against your drawing before production.
What is the difference between polyimide film and polyimide tape? Polyimide film is the bare base film - supplied in rolls or die-cut parts. Polyimide tape is the same film already coated with a high-temperature silicone or acrylic adhesive, ready to apply for masking or bonding.
Is polyimide film the same as Kapton? Polyimide film is the generic material; Kapton® is a DuPont brand of it. Weshare supplies polyimide film that meets equivalent high-temperature and insulation performance - Kapton is referenced only as an industry comparison, not as a Weshare trademark.
Get a Polyimide Film Quote - Rolls, Parts, or Tape
Tell us which format you need and we will come back with a matched construction:
Rolls: your width, core, length, and release-force grade.
Die-cut parts: upload your drawing and we will quote to your geometry.
Tape: adhesive type (silicone / acrylic), single- or double-sided, and roll size.