The first and main factor is the material of heat shrink tube. Compared with the PVDF and PTFE, under same shrink ratio, the heat shrink time of PE is shorter by same heating way .
Secondly, it depends on the size of the heat shrink tube. The size of the heat shrink tube includes the wall thickness and the length of the heat shrink tube. Obviously, the smaller the heat shrink tube is, the faster it shrink.
Finally, it is the heating tool. The heating tools are many, such as lighters, flame guns, ovens, boiling, hot air guns, etc. Obviously, the heat time of the hot air gun is faster than the hairdryer. So choosing the appropriate heating tool is one of the important reasons that affect the shrinkage time of the heat shrink tube.
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