How to distinguish copper wire? Copper wire is a wire mainly containing copper, with a content of 99.90% to 99.97%, which is very difficult to distinguish with the naked eye. When buying copper wire, generally choose a soft wire with a smooth surface, no series of patterns, and more. There are many knowledge about copper wire identification. Before copper wire identification, let's briefly understand copper. The chemical symbol of copper is Cu, and its atomic number is 29, which is a transition metal. Copper was once used to make currency, weapons, utensils, etc. A layer of green patina is formed on the surface of copper: the main component is basic copper carbonate Cu2(OH)2CO3. Copper is a purple-red shiny metal with a density of 8.92 g/cm3. The melting point is 1083.4±0.2°C, and the boiling point is 2567°C. It has good malleability.

When buying copper wire, how do you distinguish the quality of the copper wire?

1. Look at the plastic skin.

The plastic sheath of the regular wire is soft and smooth, and the color is uniform. On its surface, there should also be several items printed on the product certificate, such as specifications and models, factory name and address, etc. At the same time, the handwriting must be clear and not easy to erase. The insulating layer of fake wires seems to be very thick, but in fact, most of them are made of recycled plastics for optical cables. Over time, the insulating layer will age and leak electricity.

2, look at the length.

For the question of length enough, you can first count the number of turns, then measure the length of each turn, and then multiply the length of each turn by the total number of turns, and the number obtained is the actual wire length.

3. Look at the product label.

The electric wires should be purchased at a regular store, and look for the national electrical certification mark (3C mark). For wires produced by regular manufacturers, there will be a certificate of conformity under each bundle of transparent wrapping paper. The contents of the certificate of conformity should include: factory name, address, Certification number, specification model, wire length, rated voltage, etc. Counterfeit and inferior wires are often "three no products", but they also have ambiguous origin and other signs, such as made in China, made in a certain province or city in China, etc., which is actually equivalent to unmarked origin.

4. Identify if it is pure copper and burn the copper wire with a lighter. Many counterfeit products look bright copper on the surface, but the actual interior is aluminum, and the surface is plated with copper. The authentic copper wire will not become soft when burned with a lighter, copper-clad Aluminum becomes soft as soon as it is burned.