Mineral insulated cables are referred to as MI cables. When used for wiring, they are commonly known as mineral fireproof cables and mineral cables in China. Mineral insulated cables are composed of mineral insulating materials, copper cores and copper and other metal sheaths. In addition to good mechanical and physical properties, electrical conductivity and fire resistance, this cable also has good non-combustibility. In the event of a fire, this cable can not only ensure the firefighting power supply during the duration of the fire, but also does not produce toxic smoke, which can delay the fire.
According to industry sources, the reason why the price of wires varies greatly is due to the different raw materials used in the production process. The main raw materials for the production of electric wires are electrolytic copper, insulating materials and sheathing materials. At present, electrolytic copper in the raw material market is more than 70,000 yuan per ton, while the recycled miscellaneous copper is much cheaper; the price difference between high-quality products and defective products of insulating materials and sheathing materials is even greater. In addition, insufficient length and insufficient glue content of insulators are also important reasons for the price difference. The length of each coil of wire is 100 meters for the superior product, while the inferior product is only about 90 meters; the superior product with glue content in the insulator accounts for 35% to 40%, while the defective product is only 15%. By comparison, it is not difficult for consumers to see that the finished product The difference in the selling price of wires is caused by the tricky material. So, how to identify the pros and cons when buying wires? First, check whether there is a quality system certification; check whether the certificate of conformity is standardized; see whether there is a factory name, factory address, inspection stamp, and production date; see whether there are trademarks, specifications, voltages, etc. printed on the wires. It also depends on the cross-section of the copper core of the wire. The superior-quality copper has a bright color and a soft color, otherwise it is a defective product. The second thing to try is to take a wire end and bend it repeatedly by hand. Any product with soft hand feel, good fatigue resistance, plastic or rubber with high flexibility and no cracks on the wire insulator is a superior product.