Heat shrinking tubing

Heat shrinking tubing

Designed to meet a wide range of needs in commercial and industrial applications, heat-shrinkable sleeves guarantee: effective electrical insulation, protection against moisture, mechanical safety of components, as well as facilitating the identification of cables and elements. In our wide selection of products, you will find low, medium and high thickness wall cladding, available with and without internal adhesive, as well as a variety of internal diameters to suit your specific needs. Rely on RTE for reliable, high-quality solutions for your applications.




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thermal shrinking sheaths

Frequently Asked Questions

How to choose the right sheath
Heat shrink sheaths are used in many sectors (Automotive, Aeronautics, Aerospace, Railway, Petrochemical, Home Appliance, Electronics, Electrical wiring, Electrical panel construction, etc.), so in order to choose the sheath suitable for the use we intend to make of it, we must first know the application sector. There are multiple types of heat-shrinkable sheaths that are distinguished from each other by type of material, electrical insulation voltage, measurements, colors, and shrinkage factors.
How to choose between the various types of sheaths
You can choose between heat shrink sheaths with a low-thickness wall, a medium-thickness wall, a high-thickness wall, with internal adhesive or without internal adhesive. Sheaths with internal adhesive, in addition to ensuring electrical insulation and better mechanical efficiency, are particularly suitable for use in environments where there is moisture.
How to choose the shrinkage factor
The shrinkage or ratio factor is the value that indicates how much the sheath shrinks after being heated. The most commonly used shrinkage factors are: 2:1 – 3:1 – 4:1 – 6:1 - 3:1 With internal adhesive – 4:1 With internal adhesive. The greater the irregularity of the object to be covered, the greater the shrinkage ratio must be.
How to choose the inner diameter?
The internal diameter of the heat-shrinkable sheath must preferably be chosen so that, after free shrinkage, it is roughly 20% less than the object to be covered.
How to remove the heat shrink sleeve?
To remove the heat shrink sheath, simply cut it longitudinally using a scissor.
How to use the heat-shrinkable sheath
  • Measure the diameter of the cable or the maximum width of the object to be covered.
  • Define shrink ratio
  • Depending on the shrinkage ratio chosen, calculate the diameter of the suitable sheath.
  • Cover the cable or the object to protect
  • Proceed with the heat shrinkage of the sheath using hot air guns or tunnels.
Indications for heat shrinkage
  1. For shrinking the heat-shrinking sheath, use equipment made for this specific operation such as, for example, guns or hot air tunnels.
  2. Shrink the sheath starting at one end, the most critical, and then proceed slowly to the opposite end. This method avoids the formation of air bubbles between the inner wall of the heat shrink sleeve and the object it covers.
  3. In the event that the object to be covered is made of metal or a good heat conductor, it is advisable to preheat the object to avoid "cold zones", so as to allow a perfect and soft adaptation of the heat-shrinking sheath.
  4. In order to avoid overheating of the heat shrink sleeve, ensure a regular heat distribution. Excessive overheating of the material during the shrinking process can cause bubbling, discoloration and in some cases even breakage of the heat shrink sheath.
What is the spiral sheath used for?
The spiral sheath is used to group multiple cables or tubes in a safe and orderly manner. Its spiral shape gives the sheath flexibility, as well as making it particularly suitable for the protection of electrical conductors, telecommunications and hydraulic tubes from mechanical stress.
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