Kapton tape is a thin, high-temperature polyimide film with a low-tack silicone adhesive, used throughout motorsport harness construction. This 9 mm width on a 33 m roll is sized for narrow work — masking individual conductors and small breakouts before a heat-shrink boot is recovered over them. Because the silicone adhesive is clean-release, the tape masks the wires from the boot’s internal adhesive (or applied harness epoxy) so the adhesive bonds to the Kapton rather than the conductors, keeping the termination serviceable for future repair.
Technical Specifications
| Property | Value |
|---|---|
| Material | Polyimide film with silicone adhesive |
| Width | 9 mm |
| Roll length | 33 m |
| Total thickness | ~2.7 mil (69 µm) |
| Continuous temperature | −73 °C to +260 °C |
| Film thermal limit | ~400 °C (film only, short term) |
| Dielectric strength | 7,000 V |
| Adhesive | Low-tack silicone (clean release) |
| Colour | Amber |
The 260 °C continuous rating is the working ceiling — set by the silicone adhesive. The ~400 °C figure applies to the bare polyimide film only, not the tape.
When it is used
- Mask conductors from boot adhesive or harness epoxy during boot recovery
- Compact high-density connector breakouts before strapping or lacing
- Protect wires from heat-gun temperature while shrinking a boot
- Build up and form transitions to match the chosen boot profile
- Temporarily hold bundles before lacing (residue-free clean release)
9 mm or 12 mm?
Use the 9 mm width for narrow, single-breakout work and tight transitions. For bundle wraps, larger boots and faster transition build-up, use the Kapton Tape 12 mm x 33 m. Many builders keep both widths on the bench.
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What temperature can this Kapton tape withstand?
The tape is continuous-rated −73 °C to +260 °C — the silicone adhesive sets the working ceiling. The polyimide film alone tolerates brief excursions toward 400 °C, but 260 °C is the limit for the tape.
Does it leave residue?
No. The silicone adhesive is low-tack and clean-release, which is why it is used for masking and as a releasable layer under boots and epoxy.
Will it survive boot recovery with a heat gun?
Yes. Adhesive-lined boots recover at around 250 °C (480 °F), just below the tape’s 260 °C continuous rating.
Should I buy 9 mm or 12 mm?
Use 9 mm for narrow breakouts and tight transitions; 12 mm for bundle wraps and larger boots. Many builders keep both.
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