1. Conductor Material: High-purity electrolytic copper with a purity of up to 99.95% is used. High-purity copper has excellent conductivity, with a conductivity of 101% IACS (International Annealed Copper Standard), which can minimize energy loss during current transmission and improve power transmission efficiency. At the same time, copper has excellent ductility and toughness, which is convenient for processing into fine copper wires for stranding. The stranded conductor, while maintaining good conductivity, also has excellent flexibility and mechanical strength, and can adapt to complex underground laying environments.

2. Insulation layer material: XLPE (cross-linked polyethylene) material is selected. XLPE is a three-dimensional network structure polymer formed by cross-linking polyethylene molecules through chemical or physical methods. Compared with ordinary polyethylene, it has higher heat resistance, with a long-term operating temperature of up to 90°C and a maximum short-circuit temperature of 250°C, which can maintain stable insulation performance when the cable transmits large currents for a long time and generates more heat. In addition, XLPE also has excellent chemical corrosion resistance, can resist the erosion of acid-base substances, oil stains, etc. in underground soil, and has strong aging resistance, with a service life of more than 40 years.

3. Jacket material: PVC (polyvinyl chloride) material is used. The PVC jacket has excellent mechanical strength, with a tensile strength greater than 12MPa and an elongation at break greater than 150%, which can withstand external pressure, tensile force during underground laying, and friction from hard objects such as stones in the soil, effectively protecting the internal conductor and insulation layer. At the same time, PVC material has good moisture resistance, with a water absorption rate of less than 0.5%, which can block underground moisture from entering the cable, and has certain chemical corrosion resistance, further enhancing the adaptability of the cable in complex underground environments.

4. Style design: The cable is cylindrical in overall shape, with a black PVC jacket, and the surface is smooth and flat without obvious protrusions, depressions or scratches. This design is not only convenient for laying in underground pipes, reducing frictional resistance, but also enables the cable to be in full contact with the soil when directly buried, which is conducive to heat dissipation. The two ends of the cable are usually sealed to prevent moisture and impurities from entering. Before leaving the factory, it will be cut into different lengths according to customer needs, with common specifications such as 100 meters, 200 meters, and 500 meters, which is convenient for customers to cut and lay according to actual construction needs.

1. Conductor stranding: First, high-purity electrolytic copper is processed into fine copper wires with a diameter of about 0.4mm. In the stranding process, multiple copper wires are stranded together according to a specific stranding pitch (about 16-20 times the outer diameter of the conductor). During the stranding process, the untwisting stranding technology is adopted to ensure that each copper wire is stressed evenly, avoiding uneven conductor resistance caused by improper stranding. After stranding, the conductor is annealed by heating it to 300-400°C and keeping it warm for a period of time to eliminate internal stress generated during the stranding process and improve the flexibility and conductivity of the conductor.

2. XLPE insulation layer extrusion: After the conductor is pretreated (such as cleaning and drying), it enters the XLPE insulation layer extrusion process. XLPE granular raw materials are added to the extruder and heated to 120-150°C in the extruder to melt them. The molten XLPE material is evenly coated on the surface of the conductor through a die to form an insulation layer with a thickness of about 2.0mm. During the extrusion process, the extrusion temperature, speed and pressure are strictly controlled to ensure that the insulation layer has uniform thickness, a smooth surface, is closely combined with the conductor, and has no defects such as bubbles and pinholes. After extrusion, the insulation layer is cross-linked by means of warm water cross-linking or steam cross-linking to form a three-dimensional network structure of XLPE molecules, enhancing its heat resistance and mechanical properties.

3. Shielding layer wrapping (some models): For some cables that require shielding performance, a layer of semi-conductive shielding tape is wrapped outside the insulation layer. The shielding tape is made of semi-conductive material, which can eliminate the air gap between the insulation layer and the jacket, reduce the local electric field strength, and improve the insulation reliability of the cable. During the wrapping process, the overlap rate of the shielding tape should be ensured to be between 15% and 20% to ensure the continuity of the shielding effect.

4. PVC jacket extrusion: The PVC jacket is extruded outside the insulation layer (or shielding layer). PVC granules are added to another extruder and heated to 160-180°C to melt them. The molten PVC material is coated outside the insulation layer through a die to form a jacket with a thickness of about 2.5mm. During the extrusion process, various parameters are also controlled to ensure that the jacket has uniform thickness, a flat surface, is closely combined with the internal structure, and has no cracks, depressions and other problems. After extrusion, the cable is cooled to make the jacket solidify and form quickly.

5. Finished product inspection: The produced cables undergo a series of strict inspections. Electrical performance testing includes insulation resistance testing, withstand voltage testing and partial discharge testing. The insulation resistance test uses a 5000V megohmmeter, requiring the insulation resistance value to be not less than 1000MΩ; the withstand voltage test applies 2500V AC voltage to both ends of the cable for 5 minutes without breakdown; the partial discharge test requires that the partial discharge amount is not more than 10pC under 1.73 times the rated voltage. Mechanical performance testing includes tensile strength and elongation at break tests to ensure that the mechanical properties of the jacket and insulation layer meet the standards. In addition, the appearance, size, conductor resistance, etc. of the cable will also be inspected. Only cables that meet all indicators can leave the factory.

For urgent orders, the company will open a green channel to give priority to production, goods preparation and delivery. During the delivery process, if customers have any questions or special requirements, the customer service staff will communicate and coordinate with relevant departments in a timely manner to ensure that customer needs are met.

1. Quality guarantee: The product has a warranty period of 15 years. During the warranty period, if there is a quality problem with the product itself (such as aging and cracking of the insulation layer, conductor breakage, jacket damage, etc., which are not caused by human factors), the company will provide free repair or replacement services. Customers need to provide purchase certificates and photos of the fault. After verification by the company's technical personnel, a solution will be given within 7 working days.

2. Technical support: If customers encounter any technical problems during the installation, laying, or use of the cable, they can call the company's after-sales service hotline at any time, or consult through online customer service, email, etc. The company's technical team is composed of experienced engineers, who will provide professional answers and guidance within 24 hours, such as providing suggestions on installation plans, solving technical problems during laying, and analyzing the causes of faults.

3. On-site service: For large engineering projects or complex fault situations, the company can arrange technical personnel to provide on-site services. Technical personnel will inspect the installation quality of the cable, guide construction personnel in correct laying and connection, assist customers in troubleshooting and maintenance. The cost of on-site service is determined according to the service content and distance, and a detailed quotation will be provided to customers in advance for confirmation.

4. Complaint handling: If customers have complaints about product quality, delivery delay, or service attitude, they can feedback through the company's after-sales complaint channels. The company will record and sort out the complaints, and assign special personnel to follow up and handle them. For general complaints, a reply will be given within 24 hours; for more complex complaints, the handling progress will be reported to customers regularly, and a final solution will be proposed within 10 working days to ensure customer satisfaction.

5. Return and exchange policy: If the received products have problems such as inconsistent specifications, damaged packaging, or quality defects, customers can apply for return or exchange within 15 days of receiving the goods. The company will verify the situation, and after confirmation, arrange for the return or exchange of the goods in a timely manner, and bear the relevant transportation costs. For customized products, return or exchange is only allowed if there is a quality problem caused by the company.

6. Regular follow-up: After the product is sold, the company will conduct regular follow-up visits to customers through telephone, email, or on-site inspections to understand the use of the product and collect customer opinions and suggestions. This helps the company continuously improve product quality and service levels, and establish long-term and stable cooperative relations with customers.