Dual Wall heat shrinkable tube is a semi-flexible heat-shrinkable tube with a hot-melt adhesive inside. The outer layer is composed of radiation-crosslinked polyolefin. The inner layer is a specially designed gelled inner wall. When heated, the inner wall melts and shrinks with the outer wall. Fill the pores or gaps, and after cooling, the wall thickness of Dual Wall heat shrinkable tube is uniform and firm. It is widely used in the waterproofing of electronic equipment, the sealing of wire branches, the corrosion protection of metal pipelines, and the prevention of looseness and shedding caused by the relaxation of polymer chains, such as underwater lighting, automobile tubing, and advanced wiring harnesses.