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What is large diameter heat shrink tubing?
[Technical Explanation] What is large-diameter heat shrink tubing? Explaining its features and selection points
Heat shrink tubing is essential for protecting and bundling wires, but in recent years there has been a growing demand for large diameter (Φ30mm or more) products . Large diameter types are particularly useful in sites where large structures are used, such as for processing large diameter cables, piping, and harnesses with connectors.
This time, we will focus on large-diameter heat shrink tubing and explain its features and points to consider when selecting it.
1. Features of large diameter heat shrink tubing
● Large diameter objects can be coated all at once
Most heat shrink tubing is typically around 1 to 20 mm in diameter, but there are also larger diameter products available that can accommodate diameters from 30 mm to a maximum of 400 mm .
It can also be applied to bundled cables, large diameter hoses, pipes, etc. all at once.
● Many products have high shrinkage rates
Even with large diameters, many products have a shrinkage ratio of 2:1 to 4:1 , allowing them to accommodate a wide range of target sizes.
It is particularly easy to fit even when there are steps (such as connectors or terminals) along the way.
● Excellent insulation and mechanical protection performance
Although it depends on the material, most are made of polyolefin , which has excellent insulation, abrasion resistance, and weather resistance.
Additionally, if you choose a thicker type or a flame-retardant grade , you can use it safely outdoors or around heavy machinery.
2. Application examples
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Power cable branch protection
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Main cable processing and bus bar covering for switchboards
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Protection and identification of large diameter hoses and piping
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Terminal processing for large equipment in factories
3. Checkpoints when selecting
| Check items | Content |
|---|---|
| Maximum outer diameter of the object | Select a size that is sufficiently larger than the inner diameter of the heat shrink tubing before shrinking . |
| Shrinkage Ratio | Choose based on how tight you want it to fit after shrinking (e.g. 3:1 or 4:1). |
| Usage environment | Select the material based on whether it is required for outdoor use, high temperature, oil resistance, or flame retardancy (e.g., weather-resistant grade). |
| Minimum shrinkage diameter | Check that it fits snugly to the object after shrinking. Thickness must also be taken into consideration. |
| Shrinkage temperature and method | Check that the shrinkage temperature is appropriate for the heating method (heat gun, torch, etc.). |
4. Denka Electron's proposal
We offer large diameter heat shrink tubing available in sizes from Φ30 to Φ400mm.
We are also able to provide OEM services with a focus on domestic quality, and are flexible in handling small lots, custom cutting, printing, and more.
I don't know which size to choose.
"I want it to be thick enough for outdoor use."
"I need flame retardancy, but I also want flexibility."
Our expert staff will provide you with the best possible advice .
summary
Large diameter heat shrink tubing is ideal for protecting and insulating large diameter areas that cannot be covered with conventional tubing.
By selecting the correct size and material , wiring processing can be performed with high workability and reliability.
If you have any questions about large diameter heat shrink tubing or would like to request a sample, please feel free to use the inquiry form .
