Dual wall heat shrinkable tube is a semi-flexible heat shrinkable tube with hot melt adhesive in the inner layer. The outer layer is composed of radiant crosslinked polyolefin, the inner layer is specially designed for the colloidal inner wall, when heated the glue will melt and cover the surface of the object, forming a good sealing system. It is mainly used in the insulation seal of the automobile wire harness.

and automotive wiring harness using China's production of heat shrinkable pipe market accounted for a lower ratio, estimated at around 20%, most of the United States and Japan, but with the domestic certification of the automotive industry and cost advantages, cable casing, wire casing, automotive heat shrinkable casing market share is expected to further improve.

At present, the domestic production of double-walled pipe prices only the United States and Japanese enterprises 20%~40%, if the quality of a certain competitiveness of this piece of the prospect is still considerable, a car using China's heat shrinkable pipe is probably between the 100~200 yuan, and the use of foreign countries will reach 200~500 yuan.

Thermal shrinkage casing when the external heat is applied to the heat shrinkage sleeve, the polymer material forming the heat shrinkage sleeve restores the heat shrinkage tube into the memory form to begin to shrink, and the bonding material in the heat shrinkage sleeve is also activated. Adhesive material is to ensure that it and wires, cables, pipes, steel tightly bonded together. This process makes wires, cables, pipes, steel and heat shrinkable tubes a unified whole. Heat shrinkable tubes are wires, cables, pipes, and steels that prevent harmful elements, such as water, oil, acids, alkalis, and other environmental hazards. Heat Shrinkable Tube is the best choice for insulation and anticorrosion, so it is widely used.

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双壁热缩管的发展前景

双壁热缩管是一种内层附有热熔胶的半柔性热缩管。外层是由辐射交联聚烯烃组成，内层是专门设计的胶性内壁，加热时胶会融化覆盖在物体的表面，形成良好的密封系统。主要运用在汽车线束的绝缘密封。

而汽车线束使用中国生产的热缩管市场占比比较低，估计在20%左右，大部分都被美国和日本占据，但随着国内在汽车行业认证上的全面通过以及成本上的优势，电缆套管、电线套管、汽车用热缩套管的市场占比有望进一步提高。

目前国内生产的双壁管价格只有美国和日本企业的20%~40%，如果能在质量上有一定的竞争力这一块前景还是相当可观的，一台汽车使用中国的热缩管大概在100~200元之间，而使用国外的将达到200~500元之间。

热收缩套管当外部热量应用于热收缩套时，组成热收缩套的高分子材料恢复热缩管成记忆形态开始收缩，热收缩套内的粘合材料也被激活。粘合材料是保证它与电线、电缆、管道、钢材紧紧的粘合在一起。这个过程使电线、电缆、管道、钢材与热缩管成为一个统一的整体。热缩管是防止有害的元素，例如水，油，酸，碱和其它环境危害的电线、电缆、管道、钢材。热缩管是绝缘、防腐的最佳选择，所以它应用广泛。