Copper wire is a cable dominated by copper content, and […]
Copper wire is a cable dominated by copper content, and its composition is 99.90%~99.97%, which is difficult to distinguish by the human eye. In the case of copper wire purchase, generally choose a cable with a smooth surface, no series of product lines and too soft. The conductivity of copper wire is very good, and many are used to produce cables, cable wires, carbon brushes, etc.; with good heat transfer, they are commonly used to produce magnetic instruments and instrument panels that must be protected from magnetic influences, such as feng shui compasses, Airline instrument panels, etc.; plastic deformation is good, easy to press and cold working pressure production and processing, can be made into tubes, rods, wires, strips, strips, plates, foils and other copper materials. There are two types of copper products: smelter products and processed products.
When purchasing copper wires, the ways to distinguish copper wires are as follows:
1. Look at the plastic skin.
The plastic skin of the reliable cable is soft and smooth, with well-proportioned color tone. On its surface, several items on the product qualification certificate should also be printed, such as: model specifications, company name and production location, etc. In addition, the handwriting must be clear and not easy to erase. Fake and shoddy cables and cable sheaths seem to be very strong. In fact, most of them are made of fiber optic cable recycled plastic. Over time, the cable sheath will become brittle and lose electricity.
2. Look at the length.
For the problem of whether the length is sufficient, you can first count the number of turns, and then measure the length of each turn, and then multiply the length of each turn by the total number of turns, and the data obtained is the specific cable length.
3. Look at the product label.
When buying cables, you should buy them in large-scale reliable shopping malls. Choose the Chinese welder's verification mark. The cables produced by reliable manufacturers have a certificate of conformity under each bundle of transparent packaging bags. The content of the certificate of conformity should include: Enterprise Name of production place, verification serial number, model specification, cable length, rated current, etc. Fake and inferior product cables are usually "three no products", but there are also ambiguous signs of origin on the top, such as Chinese manufacturing, production in a certain place or place in my country, etc., which is specifically equivalent to not marking the origin .
4. Look at the copper wire.
When purchasing, you can cut off a small piece of plastic skin and check the copper wire inside. Lightly press the top of the copper wire with the palm of your hand, and the copper core of the copper core cable that meets the standard should be dark purple, shiny, and soft to the touch. The color of the copper wire of the reliable cable is bright and reddish, while the copper core of the fake and inferior copper copper core cable is purple black, dark or purple, with many residues, poor impact toughness, and poor ductility. Broken, and there are often disconnections in the cable. During inspection, if one end of the cable is stripped 2cm, then a piece of white paper is used to rub the copper core slightly. If there are gray-black chemicals on the thin paper, it indicates that there are more residues in the copper core. The fake copper wire is darker in color and strong. Pull the copper wire into a small circle. If there is too much copper wire residue, for example, the copper-clad steel wire will bounce back. If the copper is better, it will not bounce back and become a loop. Then the copper wire is gradually straightened and restored. When it is completely restored, it is confirmed that the copper wire material is indeed very good.