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Polyethylene is abbreviated as PE in English; it is a polymer of ethylene and is non-toxic. It is easy to color, has good chemical stability, is resistant to cold and radiation, and offers excellent electrical insulation properties. It is suitable as packaging material for food and drugs, for making tableware and medical devices, and can also be used as an insulating material in the electronics industry. For example: shielded cables for computers. Polyvinyl chloride, abbreviated as PVC in English, is a polymer of vinyl chloride. It has good chemical stability and is resistant to the erosion of acids, alkalis, and certain chemicals. It is resistant to moisture, aging, and fire. Its operating temperature must not exceed 60°C, as it becomes hard at lower temperatures. Polyvinyl chloride is divided into soft plastics and hard plastics. Soft types are mainly made into films for use as packaging materials, rainproof products, and agricultural seedling cultivation films; they can also be used as insulation layers for cables and wires, as well as in synthetic leather products. Rigid types are generally made into pipes and sheets; pipes are used as water pipes and for transporting corrosion-resistant fluids, while sheets are used as linings and floors for various tanks. For example: 0.6/1kv polyvinyl chloride insulated power cable. Cross-linked polyethylene, abbreviated as XLPE in English, is an important technique for improving the properties of PE. PE that has been modified through cross-linking can see a significant improvement in its properties. Not only are its mechanical properties, resistance to environmental stress cracking, chemical corrosion, creep resistance, and electrical properties all enhanced markedly, but its temperature resistance also increases substantially – the heat resistance of PE can be raised from 70°C to over 90°C, thereby **expanding the range of applications for PE. Currently, cross-linked polyethylene (XLPE) is widely used in pipes, films, cable materials, and foam products. For example: Cross-linked polyethylene insulated power cables of 35 kV and below.