1.Heat-shrinkable composite joint closure system for environmental and mechanical protection of joints are widely used in overhead erection of pipeline, the splice closure of buried and submarine communication cable; can work under an environment from -30℃to 90℃ for a long time. 2.Of super composite fibre structure and secondary sealing, with excellent mechanical strength, tear-resistant, shrinkage and resistance to weathering. 3.The sealing material is high-quality Henkel Rubber imported from Germany, its super binding strength contributes to the excellent sealing of this product.