I. Aluminum-plastic composite pipe

1, check the product appearance.

High-quality aluminum composite pipe generally has a smooth outer wall, and the trademark, specification, applicable temperature and meter number are clearly marked on the pipe wall. The manufacturer also prints the production number on the pipe wall to monitor the product quality at any time. The product is well packaged, and all kinds of signs on the package are equally clear. The name, address and telephone number of the manufacturer are printed in a prominent position. Fake and shoddy products generally have rough outer walls, unclear or incomplete marks, simple packaging and unknown address or telephone number.

2, aluminum layer can not be ignored.

A good aluminum-plastic composite pipe is welded at the lap joint of aluminum layer, and the aluminum layer and plastic layer are closely combined without delamination. However, the aluminum layers of some fake and inferior products are not welded, and some aluminum layers and plastic layers are often layered and not tight.

Second, PP-R tube

1. Product name: The product name of real PP-R should be "polypropylene pipe for cold and hot water" or "PP-R pipe for cold and hot water", and the irregular names of superfine particle modified polypropylene pipe (PP-R) or PP-R cold water pipe, PP-R hot water pipe and PP-E pipe are all pseudo-PP-R pipes.

2. The density of fake PP-R is slightly higher than that of real PP-R. ..

3. The true PP-R tube is white matt or matt of other colors, and the false PP-R tube is bright or bright.

4. The real PP-R tube is completely opaque, while the fake PP-R tube is slightly or translucent.

5. The real PP-R tube feels soft, while the fake PP-R tube feels smooth.

6. The landing sound of the real PP-R pipe is dull, and the landing sound of the fake PP-R pipe is crisp.

It should be pointed out that the service life of pseudo-PP-R tube is only 15 years, while the service life of real PP-R tube is more than 50 years.

Third, copper pipes.

Copper tube has the advantages of corrosion resistance and sterilization, and is the first-class product in water pipes. There are two ways to connect copper pipes: clamping and welding. Like aluminum-plastic pipes, ferrules have the problem of aging and water leakage for a long time, so users who install copper pipes mostly use welding, that is, welding the joints together with oxygen, so that it will never leak like PP-R water pipes. One disadvantage of copper tube is its fast heat conduction, so the hot water pipes produced by well-known copper tube manufacturers are all wrapped with plastic and foaming agent to prevent heat dissipation. Another disadvantage of copper tube is its high price. There are few residential water supply systems made of copper pipes, and I am afraid they will only be seen in export apartments and high-end villas. If you plan to change the water pipe and think the copper pipe is good, it is recommended to use welded joints.

Four, stainless steel pipe

It is a very expensive water pipe, which is difficult to construct and rarely used, and its performance is similar to that of copper pipe.