PVC (Polyvinyl Chloride Polymer) is a vinyl based polymeric material made of an amorphous material. PVC materials are often used with stabilizers, lubricants, auxiliary processing agents, colorants, impact resistant agents, and other additives. It has non flammability, high strength, high electrical insulation, weather resistance, and excellent geometric stability. PVC has strong resistance to oxidants, reducing agents, and strong acids. It is insoluble in water, alcohol, and gasoline, and has low gas and water vapor leakage; Under normal temperature, it can withstand any concentration of hydrochloric acid, less than 90% sulfuric acid, 50-60% nitric acid, and less than 20% caustic soda solution. The biggest characteristic of PVC is its flame retardancy, so it is widely used in fire protection applications. Due to its fire and heat resistant properties, PVC is widely used for wire and fiber sheath. However, PVC also has the following disadvantages: it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid, and is not suitable for situations where it comes into contact with aromatic and chlorinated hydrocarbons. Poor thermal stability, prolonged heating can lead to decomposition, releasing HCL gas, and discoloring PVC.

XLPE uses high-density polyethylene as the main raw material. Through the action of high-energy radiation or chemical initiators, it transforms the linear macromolecular structure into a spatial network structure. Crosslinking can significantly improve the performance of polyethylene materials. Compared to polyethylene, crosslinked polyethylene has excellent resistance to environmental stress cracking, heat resistance, thermal strength, heat aging resistance, creep deformation resistance, high tear resistance, notch cracking resistance, electrical insulation, flame retardancy, barrier property, vapor resistance, and aromatic properties, and overcomes the sensitivity of ordinary polyethylene to fillers. In addition, the following materials are often added to the insulation and sheath of cables to make them have special uses.

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