At present, polypropylene (PP) pipes for building drainage are mainly used in home decoration, and HDPE pipes are mainly used for municipal buildings. Consumers should pay attention to the following points when choosing polypropylene (PP) pipes, homopolypropylene (PPH) and HDPE pipes for building drainage: first choose products that implement the national standard, and consumers should pay attention to observing the pipes when purchasing pipes. Whether it is marked to implement the national standard, if the implementation is the enterprise standard, attention should be paid to it; pay attention to observe the appearance of the pipe, the pipe should be smooth, flat, free of bubbles, discoloration and other defects, uniform in color, no impurities, and uniform wall thickness; pay attention to the water supply pipe. Pressure level, pay attention to select the pressure level that meets the actual use requirements. Generally speaking, pipes with pipe series S below 2.5 should be used for hot water pipes, that is, the wall thickness of pipes with an outer diameter of 20 should be more than 3.4 mm, and the wall thickness of pipes with an outer diameter of 25 should be more than 4.2 mm; the pipes should have sufficient rigidity. In particular, the drainage pipe should not be deformed when pressing the pipe by hand; the raw material should be selected from a manufacturer with stable supply and quality.
