The cold shrink tube is a kind of rubber insulating sleeve that expands in advance on the ejectable support tube. When in use, the support tube can be ejected only after positioning, and the radial pressure can be used to form a coating, which plays the role of waterproof and moisture-proof sealing.
Support tube is an indispensable part of the cold shrink tube, so how to choose the support tube?
The support tube is available in PP and PE materials.
PE has excellent chemical stability, resistance to various chemical corrosion at room temperature, low water absorption, excellent electrical insulation.
PP density is small, is one of the lightest plastic varieties; Except impact resistance, mechanical properties and other mechanical properties are better than PE, has good molding performance; The transparency of PP products is better than that of high density PE products. Also, the most outstanding performance is the resistance to bending fatigue.
In conclusion, PP materials has a better performance than PE. Volsun has been using PP material support tube to produce cold shrink tube.
In addition, the size of the support core should be selected according to the range of use. The following table is the size and recommended range of wolshing support core:
| Size (mm) | Application range（ID） | Length（L） |
| 6×1.5mm | ≤Ø40 | ≤350mm |
| 7×1.8mm | Ø45-Ø60 | ≤450mm |
| 7×2.0mm | Ø60-Ø80 | ≤600mm |
| 8×3.3mm | ≥Ø90 | ≤1000mm |
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