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The heat-shrinkable sleeves are made from high-quality polymers. They are scientifically formulated and mechanically blended into polymer alloys. After forming, they undergo radiation cross-linking with an electron accelerator and continuous expansion. They possess excellent flame retardancy, environmental safety, and insulation properties. They are very soft and elastic, have a low shrinkage temperature, and rapid shrinkage. They are particularly suitable for protecting temperature-sensitive components and can also be widely used in coating and insulation protection during wire processing, solder joint protection, and encapsulation of electronic components.