With a series of products is shrinking underground and overhead corrosion and weld steel pipe insulation pipe insulation designed to complement mouth. It is made of radiation crosslinked polyolefin composite substrate made of hot melt and specialty seals, special seals hot melt and polyolefin substrate and the surface and solid epoxy coating can form a good bond. WK-WSS shrinking with the installation of heating, the radial contraction of the substrate at the same time, the internal composite layer melted, tightly covered the mouth at the meeting, together with the base material into a solid shape in the pipeline corrosion body has excellent resistance to abrasion, corrosion resistance, impact resistance and good UV resistance and aging properties of light. Also known in the industry with a shrinking loop, the relative thermal sets of sets of terms called death, in addition to shrinking with the subject, comes with plastic strips and fixed film, and shrink with the ease of mass production, the construction also a lot easier.