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First of all, power insulation heat shrink in the wall thickness is medium thickness, to be slightly thinner than the casing.

Second, the hot-shrinkable coating of the wall tube is hot melts, 75-caliber straight-coated, 75-caliber and above specifications using the spiral coating method, from the appearance of the difference is obvious, is a mechanical coating of the products, but the casing is usually hand-painted at both ends, can also be fully coated, the coating is the glue layer is cold glue, waterproof performance is inferior to the wall casing.

Because the gelatinize way is not the same, in general, the heat shrink in the wall tube to do the largest caliber is 200, and the heat shrink casing can do 300, mainly in the middle wall tube large caliber spiral coating equipment is more expensive. In addition, the two products of polyethylene substrate formulations are not the same, the middle wall tube material is softer.

Finally, due to the many differences, there are also many differences in the use of heat-shrinkable wall tubes and heat-shrinkable casing, which are mainly used in the middle connection of the cable, and can be used in other products such as automobiles, while the heat-shrinkable casing is basically used as the inner and outer sheath of the cable intermediate connection. At the same time, the hot shrinkage of the wall tube products abroad used more, the domestic market is not very large.

The electric insulating casing is a kind of common insulation protection heat shrink casing on the cable, this kind of product main material is PE, after irradiation crosslinking and heating expands these two processes, have the heat shrinkage function, the shrinkage ratio is about 3:1, caliber from 50-350mm unequal. It can be used as heat shrink inner sheath, outer sheath, and outer insulating waterproof casing in cable accessories.

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