1. From the connection mode, the aluminum-plastic pipe adopts the physical connection mode, which is simple and convenient. Unless the operation is improper, its safety and reliability are very high. PE and PP-R are connected by hot melting or electric melting, which is complex and easy to produce stacking defect area, resulting in stress concentration, thus affecting the long-term performance of the pipeline; In addition, the local high temperature of the electric fuse is easy to promote the degradation of the pipeline material and accelerate the aging of the pipeline.

2. In terms of long-term health performance, the middle aluminum layer of aluminum plastic pipe can isolate oxygen, and microorganisms and algae are not easy to breed. Antioxidant is allowed to be added to the outer PE, which will not cause water pollution in the inner layer. PE pipe and PP-R pipe can not block oxygen, which is easy to cause the reproduction of microorganisms and algae and affect the sanitation of drinking water; It also contains a large number of antioxidants, which is easy to cause water pollution.

3. In terms of high temperature resistance, the long-term service temperature specified in the national standard of aluminum plastic pipe is 95 ℃, and the maximum service temperature is 110 ℃, which can fully meet the needs of domestic water; The performance of PE pipe decreases rapidly with the increase of temperature, which is limited to cold water transportation; The long-term service temperature specified in PP-R national standard is 70 ℃, and the maximum service temperature is 95 ℃, which has certain limitations in the use of hot water pipes.

4. From the perspective of aging resistance, the molecular structure of aluminum-plastic pipe is stable, the inner and outer layers are separated by PE, and sufficient anti light and anti oxygen stabilizers are allowed to be added to the outer layer without affecting the sanitation of the inner layer in contact with water; The molecular structure of PE pipe is stable, but the single-layer structure is not conducive to the addition of stabilizer, which is easy to cause secondary pollution of water in the pipe; PP-R tubes contain a large number of unstable tertiary carbon atoms, which are easy to be aged by light, oxygen and impurities.