Heat shrinkable sleeve, also known as mending shrinking sets, closed sets, we are usually referred to as thermal units. Heat shrinkable sleeve mending insulation products for underground and overhead weld steel pipe corrosion and heat pipe design. Heat shrinkable sleeve is mainly used in all pipe diameters ranging between DN25-DN2000, can also be used for pipe flange joints, sealing corrosion lock hoop site. Substrate thickness from 1.0 to 2.0mm, layer thickness from 0.8-2.0mm. Heat shrinkable sleeve structure consisting of: a composite of radiation crosslinked polyolefin substrate and special seals made of hot melt, hot melt adhesives and specialty sealing polyethylene substrate, the steel surface and solid epoxy coating can form a good bond . Advantages of heat shrinkable sleeve: heat shrinkable sleeve when installed in a radial contraction of the substrate at the same time, internal composite layer melted, tightly covered in the mending, together with the substrate in the pipeline has become a solid shape antiseptic body, has excellent wear resistance, corrosion resistance, impact resistance and good resistance to UV and light aging properties. Heat shrinkable sleeve performance parameters: heat shrinkable sleeve Application Guide (Executive Standard: SY / T0413-2002 and EN12008) TS50 (mastic) TS60 TS80 maximum operating temperature of 60 ℃ 70 ℃ 85 ℃ applicable external corrosion coating PE, FBE, PP or steel PE, FBE, PP PE, FBE, PP pipe preheating temperature 60 ℃ 75 ℃ 85 ℃ recommended rust grade Sa2.5, St3.0 Sa2.5, St3.0 Sa2.5, St3.0 heat shrinkable sleeve Performance indicators Performance Test Method Typical Typ WSS50 (mastic) WSS60 primer solids content (%) GB / T1728 99.5 99.5 cathodic stripping (65 ℃, 48h) mm Q / SY GJX0113-2007 (Appendix D) 8 8 substrate Tensile strength Mpa GB / T1040-92 18 19 Elongation at break% GB / T1040-92 500 550 Dielectric strength MV / m GB / 1408.1-99 28 28 Volume resistivity Ω · m GB / T1410-89 4.0 × 1015 4.0 × 1015 Water Absorption% ASTM D570 0.02% 0.02% thermal aging (150 ℃, 21 天) GB / T1040-92 Tensile strength Mpa 17 18 450 480% elongation at break of resistance to UV aging EN12068 Elongation at break% 440 480 Hot Melt softening point ℃ GB / T4507-85 78 114 heat shrink peel strength GB / T2792-98 primed steel N / cm 70 160 对 PE N / cm 70 80 cathodic stripping (70 ℃, 30d) mm SY / T 0413-2002 / 10 hot soak ASTMD870-2002 no delamination under test conditions, no traces of water erosion is no stratification under test conditions, no traces of water erosion