The copper material used in copper cables should be electrolytic copper. At present, electrolytic copper in the raw material market costs more than 70,000 yuan per ton, while recycled miscellaneous copper is much cheaper; the price difference between high-quality products and defective products of insulation materials and sheathing materials is even greater. In addition, insufficient length and insufficient glue content in the insulator are also important reasons for the price difference. The length of each coil of wire is 100 meters for high-quality products, but only about 90 meters for defective products. The glue content of the insulator accounts for 35% to 40% of high-quality products, while only 15% is for defective products. Through comparison, it is not difficult for consumers to see that the difference in sales price of finished wires is caused by the flaws in the materials.

How to identify the pros and cons when buying wires?

One thing to watch. Check whether there is a quality system certification; whether the certificate of conformity is standardized; whether there is the factory name, factory address, inspection seal, production date; whether there are trademarks, specifications, voltage, etc. printed on the wires. Also look at the cross-section of the copper core of the wire. High-quality copper is bright and soft in color, otherwise it is a defective product.

Second, try. You can take a piece of wire and bend it repeatedly by hand. Any wire that feels soft to the touch, has good fatigue resistance, has high plastic or rubber feel and has no cracks in the wire insulation is a high-quality product.