Second, the comparison between PPR water pipe and pe water pipe:
For drinking water, PE is generally used as cold water pipe; PPR (special hot water material) can be used as hot water pipe; There is also PPR (cold water material) of cold water pipe;
If you want to make hot water pipes, PPR is certainly good;
(If it is a drinking water pipe in home decoration, there is no difference, basically PPR is used more than pe) If it is a cold water pipe, please refer to the following differences:
Comparison of temperature resistance between 1.PPR water pipe and polyethylene water pipe
In normal use, the highest stable temperature of PE water pipe is 70℃ and the lowest temperature is -30℃. That is to say, it is safe and reliable to use PE water pipes for a long time in such a temperature range.
Under normal use, the highest stable temperature of PPR water pipeline is 70℃ and the lowest stable temperature is-10℃, which also shows that it is safe and reliable to use PPR water pipeline for a long time in this temperature range. It is concluded that PE water pipe and PPR water pipe have the same high temperature resistance. However, PE water pipe is superior to PPR water pipe in low temperature performance.
Second, the difference between PE water pipes and PPR water pipes in hygiene. The main chemical molecular component of PE water pipe is polyethylene. Readers who have studied organic chemistry know that this product consists of two carbon atoms combined with five hydrogen atoms, one of which is combined with carbon atoms through a double bond, and then ethylene molecules are polymerized in a certain way. This product is a polyethylene product. So what is PPR water pipe? The main component of PPR water pipe is propylene, that is, three carbon atoms are combined with seven hydrogen atoms, and one hydrogen atom is combined with carbon atoms by double bonds, and then the product formed by polymerization is polypropylene products. Such products are almost the same in health and safety. What matters is whether the raw materials used by the enterprise meet the requirements, not whether there are differences between the two products. It is also unfounded to promote that PE water pipes are more sanitary than PPR water pipes in newspapers. All qualified PE water pipes and PPR water pipe products must pass sanitary inspection (except fake and shoddy products). It is also cheating consumers to say that PE water pipes are more hygienic and safer than PPR water pipes.
Third, elastic modulus.
The elastic modulus of PPR water pipe is 850MPa, and pe water pipe belongs to medium density polyethylene, and the elastic modulus is only about 550MPa. Good flexibility and insufficient rigidity. When used in the field of building water supply, the pipeline is not straight, easy to bend and deform, and the pipeline is not beautiful.
Thermal conductivity: PPR water pipe 0.24, pe water pipe 0.42, nearly twice as high. If used in floor heating, this is its strength. Good heat dissipation means better heat dissipation effect, but it is its disadvantage to use it in hot water pipes. Good heat dissipation leads to large heat loss and high surface temperature of the tube, which is easy to burn hands.
Fourth, solderability.
Although both PPR water pipes and PE water pipes can be welded by hot melt, PPR water pipes are easier to operate, and the flanging of PPR water pipes is round, while the flanging of PE water pipes is irregular and easy to block. Welding temperature is also different, PPR water pipe 260℃, pe water pipe 230℃. The special welding machine for PPR water pipe in the market is easy to cause water leakage. In addition, due to the easy oxidation of PE water pipe material, the oxide scale on the surface must be scraped off with special tools before welding, otherwise a truly complete pipe cannot be formed, and the pipe is prone to water leakage, which makes the construction more troublesome.
Five, low temperature impact strength:
This is the strength of PE water pipe material in index. PPR water pipe is stronger than pe water pipe, and PE water pipe is more flexible than PPR water pipe, which is determined by the nature of the material. However, it is meaningless to exaggerate the cold brittleness of PPR water pipes. PPR water pipes have been used in China for more than ten years. Through effective packaging and strengthening publicity, manufacturers gradually minimize the hidden dangers caused by improper handling. Rough handling and construction can also cause scratches and stress cracking on the surface of PE water pipes. When used at low temperature, any pipeline must be insulated, otherwise it will freeze and crack due to volume expansion caused by icing. 6. The maximum size of 6.PE tube can be dn 1000, and the maximum size of PPR is dn 160. Therefore, PE pipes are used for drainage pipes and PPR is generally used for water supply pipes.