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Common specifications of Polyolefin heat shrink tubing in industrial applications

Jul 28, 2025

Introduce

The heat shrink property refers to the ability of a material to significantly contract back to its original shape when heated. Materials with heat shrinkability include polyolefin, fluoroplastics, and PVC. These materials are pre-treated through crosslinking and stretching to obtain shape memory. When heated to a temperature range of 70°C to 150°C, they return to their predetermined shape. The dimensional changes occur mainly in radial shrinkage and axial variation.



Why Polyolefin Tubing Can Achieve Heat Shrinkage Performance


Polyolefin material is a heat-shrinkable plastic material type with excellent resistance to fuel, oil, abrasion, solvents, acids, and alkalis.Polyolefin tubing is mainly made from a mixture of polyolefin and PE.


In terms of processing,polyolefin heat shrink tubing that has been treated with crosslinking technology can undergo a heat shrink reaction, which is essentially a shape memory effect of polymer materials.


The heat shrink characteristic of polyolefin tubing is primarily radial, with the diameter typically reduced by about 50%, while the wall thickness correspondingly increases by approximately twofold. The length, however, undergoes only slight variation. Once shrunk back to its predetermined state, the polyolefin tube tightly conforms to the surface of the target object, providing effective protection which enhances the mechanical protection and insulation of the target object, including abrasion and bend resistance, as well as waterproofing, dustproofing, and corrosion protection.


Common specifications of Polyolefin heat shrink tubing in industrial applications


Polyolefin heat shrink tubing specifications


Polyolefin heat shrink tubing offers a wide variety of specifications and dimensions, including classifications by shrink ratio, diameter and wall thickness, length, and functional modifications through various additives,Let's discuss size specifications.


Size(inches)
Size(Millimeters)
Typical Wall Thickness
1/16″1.59 mm0.40 – 0.45 mm
3/32″2.38 mm0.42 – 0.48 mm
1/8″3.18 mm0.45 – 0.50 mm
3/16″4.76 mm0.50 – 0.55 mm
1/4″6.35 mm0.55 – 0.60 mm
3/8″9.53 mm0.60 – 0.70 mm
1/2″12.7 mm0.65 – 0.80 mm
3/4″19.05 mm0.75 – 0.90 mm
1″25.4 mm0.85 – 0.1 mm


These options provide polyolefin tubing with a broader range of applications and the ability to accommodate more complex shape requirements.Fokca offers different sizes and specifications of Polyolefin heat shrink tubing types, which you can choose to purchase according to your needs.



What is Crosslinking Technology?


In the heat shrink characteristics of polyolefin heat shrink tubing, crosslinking technology enables the material to form a three-dimensional network structure. This structure allows the tubing to shrink uniformly when heated without melting, thereby achieving its heat shrink function.


In terms of flame retardancy, after adding flame retardants, the crosslinked tubing structure helps the flame retardant to distribute more stably and function effectively.


Therefore, whether for heat shrinkability or flame retardancy, the application of crosslinking technology is essential in polyolefin heat shrink tubing.


But you need to know although the cross-linking process can make Polyolefin tubing heat-shrinkable, it cannot shrink cyclically. It is stable after cooling and will not shrink when heated later.



Definition of Crosslinking Technology


Cross-linking refers to the process of creating chemical or physical bonds between polymer molecular chains through chemical or physical methods, forming a three-dimensional network structure. This structure prevents the material from melting and flowing like conventional plastics when heated. Instead, it enables the material to "remember" its original shape and return to it, thereby achieving the heat shrink effect.



Common Crosslinking Methods


Radiation Crosslinking: Uses electron beams or gamma rays to induce crosslinking between polymer chains.


Chemical Crosslinking: Involves adding crosslinking agents that promote crosslinking reactions under heat treatment conditions.


Silane Crosslinking: Achieves crosslinking through silane chemical reactions in a humid and warm environment.


Crosslinking technology can be applied to various types of tubing—FEP/PTFE,PVC.



Role of Crosslinking Technology in Heat Shrink Tubing


Heat Shrink Memory: Crosslinked tubing can shrink back to its preset size when heated, ensuring a tight and secure fit around the covered object.


Enhanced Heat Resistance: The crosslinked structure allows the material to remain stable at high temperatures, making it less prone to melting or deformation.


Improved Mechanical Properties: Crosslinking increases the toughness of the tubing, enhancing its tensile strength and abrasion resistance.


Increased Chemical Stability: Crosslinked materials offer greater resistance to solvents, oils, acids, and alkalis.


Environmental Aging Resistance: Crosslinked tubing is more resistant to environmental factors such as UV radiation and ozone, resulting in a longer service life.



Conclusion

If you would like to learn more about the features, four types, applications, and other aspects of Polyolefin Tubing, you can browse our product page online or contact us directly.



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