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Factors affecting shelf life of Cold Shrinkable Accessories

2022-04-08
Cold Shrinkable Accessories is a polymer material expanded after vulcanization of silicone rubber, so there will be aging problems of polymer materials, including temperature cycle, ultraviolet rays, foreign bodies and so on. In addition, the shrinkage range of the cold shrinkage accessories is limited. If the deformation is too large and exceeds the design allowance, the shrinkage may not be in place, and the shelf life of the cold shrinkage accessories is generally not too long. During the storage period, the cold shrinkage parts will not have obvious permanent deformation or elastic stress relaxation, otherwise, after installation on the cable can not ensure enough elastic compression force. Now let's take a look at the factors that affect the shelf life of Cold Shrinkable Cable Accessories:

Before the Installation

1.Aging of polymer materials. As the Cold Shrinkable Accessories are mainly made of silicone rubber vulcanized after expansion, the influence of temperature cycle, ultraviolet radiation, material magazines and so on will lead to the aging of polymer materials. This means that from the beginning of raw material production, has entered the aging cycle. Especially after the expansion of cold shrinkage cable accessories, the aging degree will be greatly increased. The higher the aging degree, the lower the shrinkage deformation rate.

2.Permanent deformation is excessive. If the permanent deformation is too large to exceed the design allowance, improper shrinkage may occur and lead to installation quality problems. Generally speaking, there will be obvious permanent deformation after half a year of expansion of cold shrinkable cable accessories. So cold shrinkable cable accessories are rarely in stock, are real-time production according to order requirements.

3.Storage environment. The shelf life of cold shrinkage cable accessories will be greatly affected by long-term storage in places with large and rapid temperature changes, long-term close to heat source, long-term high temperature exposure and so on. And in cold weather or cold areas, because the temperature is too low, low temperature brittleness of silicone rubber will appear, which will greatly affect the shrinkage performance of cold shrinkable tube, and even lead to unavailability. Brittle cracking may occur after installation, which is also the reason why cold shrinkable material cannot be widely used in cold areas.

After the Installation

Operating Environment Impact. Cold shrinkable cable accessories due to the use of a variety of environment, complex and changeable, at the same time the line itself running conditions and other factors, will also affect the shelf life of cold shrinkable cable accessories. For example, external attachment leads to cracking of cold shrinkable cable accessories.

In recent years, with the progress of technology, especially the improvement of vulcanization process of silicone rubber, the shelf life of high quality cold shrinkable cable accessories can reach two years or more. The cold shrinkable cable accessories produced by HUAYI CABLE ACCESSORIES Co.,Ltd. are made of imported silicone rubber materials, with more scientific material formula and more advanced expansion technology, which greatly improves the life of cold shrinkable cable accessories. However, it needs to be reminded that, in order to ensure the best use effect of cold shrinkage cable accessories, it is recommended to install and use them within half a year after purchase, do not store them for too long, and arrange the purchase plan reasonably according to the construction period.


cold shrinkable termination tube

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