Copper core color

Good copper cores are usually purple red in color, with high brightness and a good hand feel,

Poor quality copper chips are yellow and white. When it comes to buying, you need to peel off the outer layer of the wire to see,

Rubbing the copper core on white paper, if there is black material, it is not a good wire。

Insulation layer

Not only is the light core important, but the insulation layer is also important. Repeatedly bending the wire, the deeper the crease, the worse the quality,

The quality of copper wire

Judging from the quality of the copper wire, the higher the brightness, the better the copper quality, and the brightness should be uniform, glossy, and without any layering. A qualified copper core wire should have a purple red color, luster, and soft touch. If you can peel off a small piece of plastic skin, carefully inspect the copper wire inside, and lightly touch the top of the copper wire with your palm, the feeling should be flat and without any sharp pain, with a relatively soft touch. However, counterfeit copper core wires have copper cores that are purple black, yellowish or white, with many impurities and poor mechanical strength,Poor toughness, it can break with a little force, and there are often broken wires inside. When checking, you just need to peel off one end of the wire by 2CM, and then rub a piece of white paper slightly on the copper core. If there is black substance on the white paper, it indicates that there are more impurities in the copper core. In addition, the insulation layer of fake and inferior wires may seem thick, but in reality, most of them are made of recycled plastic. Over time, the insulation layer will age and leak electricity, which is inevitably a low-quality product.

Quality of insulation sleeve

The second factor that determines the quality of a wire is the insulation sleeve, which is the plastic skin on the outside of the wire. A good insulation layer should be evenly thick and tightly adhered to the core, so that the wire core does not have too much on one side or too little on the other.

In addition, regardless of the color of the insulation sleeve, the surface is smooth. Take a wire head and bend it repeatedly by hand. A high-quality product is one that feels soft, has good fatigue resistance, has a strong plastic or rubber feel, and has no cracks on the wire insulation.