Shrink ratio is one of the important performance parameters of cold shrink tube. So what is the shrink ratio? Shrink ratio also can be called expansion ratio, it refers to the change of inner diameter of prefabricated silicone tube after the main body is expanded, that is, the ratio of inner diameter after expansion to that before expansion.
The shrink ratio can be expressed by a formula like this:  
 
Shrink ratio= Before shrink ID / After shrink ID %. 



Do you know that the importance of shrink ratio for cold shrink tube ? We know that the shrink ratio is a very important technical parameter of the cold shrink tube. So how to increase the expansion rate is related to many technical factors. First, it is the raw material. Silicone rubber production and processing technology has matured and has long-term application experience. It is recognized as the preferred raw material for cold-shrinkable products. Traditional ethylene-propylene rubber has been gradually eliminated due to its harder texture. Even if silicone rubber is used, the technical formulas of different manufacturers are different, the expansion force that the silicone rubber can withstand is also different, which will limit the expansion rate.


Volsun silicone rubber material cold shrink tube has a high shrink ratio 5:1, and the shrink ratio of EPDM cold shrink tube is 3.5:1. 
The greater the expansion rate of silicone tube, the greater the radial pressure generated after shrinkage, so that the interface electrical performance and waterproof sealing performance is better, the insulation protection will be more safe and durable. 



Cold shrink tubes are mostly used for waterproof sealing insulation purpose of cables, connectors, joints in telecom industry or electric power industry. For same size cold shrink tube, the bigger shrink ratio, the better waterproof seal performance.
 
Cold shrink products are small, but with a big function, connecting a wonderful world. Welcome to contact us for more details via volsun2006@szvolsun.com
Or please browse the following website:
www.coldshrinktubing.com         www.szvolsun.com

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