Introduction

Use this guide to learn how to use heat shrink tubing to repair frayed sheathing on a wire or cable.

Measure the diameter of the wire, and then choose a piece of heat shrink that will be large enough to slide onto the wire before heating but will still provide a snug fit once heated. The shrunken diameter should be slightly smaller than the wire's diameter to ensure a tight fit.
  • Measure the diameter of the wire, and then choose a piece of heat shrink that will be large enough to slide onto the wire before heating but will still provide a snug fit once heated. The shrunken diameter should be slightly smaller than the wire's diameter to ensure a tight fit.

    • Heat shrink tubing has a shrink ratio that dictates how much the tubing will shrink once heated, so it's important to choose the right ratio for the job. For example, a length of 2:1 ratio tubing with a diameter of 2 mm will shrink to a diameter of 1 mm.

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Measure a length of heat shrink tubing that is slightly longer than the damaged section of wire.
  • Measure a length of heat shrink tubing that is slightly longer than the damaged section of wire.

    • Most heat shrink tubing will also shrink longitudinally (around 5-15%), so be sure to give yourself enough tubing to cover the exposed area after heating.

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  • Use a pair of scissors to cut the tubing to the appropriate length.

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  • Slide the tubing onto the wire so that it covers the damaged/exposed section.

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  • Use a heat gun to shrink the tubing.

    • Keep the heat gun moving back and forth along the length of tubing, as staying in one place can damage the wire even further.

  • Continue heating the tubing until it is tightly secured to the wire.

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Finish Line

16 other people completed this guide.

Geoff Wacker

Member since: 09/30/2013

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84 Guides authored

One Comment

I find that using a rectangular, one-sided razor blade instead of scissors makes for straighter/cleaner ends, especially vs. larger diameter tubing.

Michal Kotelba - Reply

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