One: observation
The quality of copper pipe can be judged by observation, we first look at the color of the copper pipe, roughly divided into purple copper, brass. Under normal circumstances, the color of the copper pipe presents a single color, such as purple copper pipe, general color reddish basically can be concluded that it is good, look carefully at the color of the adulteration, and even the appearance of impurities, basically concluded that this copper has impurities, belong to the poor quality of the copper pipe.
Second: test
Good quality copper pipe must be made of pure copper, copper metal has a characteristic: good ductility. High-quality copper pipe will have a dark line appears, this dark line is not that it is a little flawed quality, on the contrary, is to show that its ductility is very good.
In the purchase, you can also scratch a copper pipe inside, if the inner wall and outer wall is the same, it shows that the overall quality of the copper pipe fittings is relatively good. If the inner wall and outer wall is obviously a little different, then beware, the copper may contain some iron.
Three: tensile
When the appearance and simple test are qualified, the last inspection process is stretching. Processing and molding of copper pipe, mainly divided into hard state, semi-hard state, soft state of three, different forms, show the flexibility is not the same you only need a little force on the copper stretching. Good quality brass tube, is slightly easy to deform, on the contrary, very hard, or not easy to deform.
