How to judge the quality of copper tubes
1
When purchasing, you need to observe the color of the copper tubes and make different color judgments according to the type of copper tubes purchased. For example, red copper with a reddish color is good copper. There are also brass tubes, which are generally better with lighter colors. Some inferior coppers have impurities inside, so they can be broken into two pieces by bending them with your hands. If there are black impurities inside, don't buy them.
2
Touch the inner wall of the copper tube to see if it is smooth and clean, and see if there are defects such as sand holes, oxidation, and cracks. If you are not sure, you can also scrape the copper tube with a sharp object. Generally, good copper tubes are made of pure copper and have better ductility, so high-quality copper tubes will have a deep line. After scratching the inside of the copper tube, if it is the same as the outer wall, it means that the overall quality of the copper pipe fittings is relatively high. But if the color or other aspects are different, it is very likely that some substances such as iron have been added to it.
3
Generally, processed copper tubes are mainly divided into three types: hard, semi-hard, and soft. Different shapes have different flexibility, which can generally be determined by bending the copper tube. High-quality copper tubes are very easy to bend, but if it is difficult to bend or cracks appear after bending, it indicates that the quality of the copper tube is not very good.
