Double-wall tube refers to the heat-shrinkable tube with hot-melt adhesive in the inner layer. Hot-melt adhesive plays the role of waterproof and displacement prevention. 

Double-wall pipe classification: according to the thickness of the double-wall

wall thickness of 0.4 ~ 0.85 mm 

wall with rubber tube wall thickness 0.9 ~ 1.20 mm 

thick wall with a rubber tube wall thickness 1.4 mm or more 

Double-wall tube is generally used in waterproof  of wire connection, and the sealing or fixed wire and cable branch.

For shrink ratio, it is 3:1 and 4:1 The biggest size can be 52mm. 

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