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Performance difference of several water pipes

Source: Date:2015-5-6

At present, the aluminum-plastic pipe, PE pipe, and PP-R pipe commonly used in the home improvement market have large differences in performance due to different materials and processes.

1. From the perspective of the connection method, the aluminum-plastic pipe uses a physical connection, which is simple and convenient. Unless it is operated improperly, its safety and reliability are very high. PE and PP-R are connected by hot-melt or electric fusion. The process is complex, and it is easy to produce stacking defect areas, which leads to stress concentration and affects the long-term performance of the pipeline. In addition, the local high temperature of the electric fuse is easy to promote the degradation of pipeline materials and accelerate pipeline aging. .

2. From the perspective of long-term health performance, the aluminum layer in the middle of the aluminum-plastic pipe is isolated from oxygen, which is not easy to cause the growth of microorganisms and algae. Generally, the outer layer of PE is allowed to be added with antioxidants, which will not cause pollution of the inner layer of water quality. It can't block oxygen, it is easy to cause microorganisms and algae to multiply and affect the sanitation of drinking water; and it contains a lot of antioxidants, which is easy to cause water pollution.

3. From the perspective of high temperature resistance, the long-term use temperature specified by the national standard of aluminum-plastic pipes is 95 ℃, and the maximum use temperature is 110 ℃, which can fully meet the needs of domestic water; PE pipes' performance quickly decreases with the increase of temperature, only Limited to cold water transportation; the long-term use temperature specified by the PP-R national standard is 70 ° C, and the maximum use temperature is 95 ° C, which has certain limitations in the use of hot water pipes.

4. From the perspective of aging resistance, the aluminum-plastic pipe has a stable molecular structure, and the inner and outer layers of PE are separated. The outer layer allows the addition of sufficient light and antioxidant stabilizers without affecting the hygiene of the inner layer in contact with water. The molecular structure of the PE pipe is stable. However, the single-layer structure is not conducive to the addition of stabilizers, which may lead to secondary pollution of the water body in the pipeline; PP-R pipes contain a large number of unstable tertiary carbon atoms, which are susceptible to aging due to the action of light, oxygen, and impurities.

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