PPR tubes on the market are mainly white, gray and green. Under normal circumstances, recycled plastics can not make white, so consumers often think that white is the best. In fact, this view is more one-sided. With the progress of technology, color is not the standard to identify PP-R tube. The quality of the pipeline can not solve the problem. If it is touched, rough particles are likely to be mixed with other impurities. 2. "Smell": keep odorless. The main material of PP-R pipe is polypropylene. Good pipe has no smell, bad, and has a strange smell. It is willing to mix with polyethylene instead of polypropylene. 3. "Extrusion": PP-R tube has considerable hardness and can be extruded into deformed tube, which is certainly not PP-R tube. 4. "Crushing": a good PP-R tube has good "elasticity" and is too easy to crush. Naturally, it is not a good PP-R tube. However, strong hardness is not equal to good elasticity. How not to break PP-R pipe will leave consumers a problem. Because some illegal manufacturers increase the hardness of pipelines by adding too much calcium carbonate and other impurities, brittle cracks are easy to occur in this kind of work for a long time. 5. "Combustion": ignition, very intuitive and effective. PP-R pipe is mixed with recycled plastics and other impurities to produce black smoke and pungent smell; Good materials burn without black smoke or peculiar smell, but the molten liquid is still clean after combustion. The characteristics of commonly used plastic pipes and PVC pipes for main purposes have good tensile strength and compressive strength, but they are more flexible than other plastic pipes and have good corrosion resistance. They are the cheapest among all kinds of plastic pipes, but they are bonded, looped and flange threaded connection at low temperature. They are mainly used for residential life, mining, agricultural water supply and drainage, irrigation, gas supply, gas supply and drainage.

How to connect PP pipes:
1. Using the molten pipe, also cut the damaged pipe into a length equal to the length of the corresponding molten pipe plus 2 cm. 2. Remove the damaged part of the hose. 3. Thoroughly clean the surfaces of the two parts to be jointed with sandpaper and solvent, and wait for the pipe parts to be completely dry. 4. Remove the liner from the two melted sleeves. 5. Place the welded joint completely in the pipe section. A new hose with the same length and diameter as the damaged hose. 6. Cut a new pipe with the same length and diameter as the damaged pipe. 7. Place the new pipe in the damaged position. Move the two melting sleeves towards the new pipe to about half the length of the melting sleeve (at this time, the part to be joined is in the center of the melting sleeve). 8. Use fusion welding tools to weld joints. I need to buy PPR pipe welding machine. Now I use it. For example, if I want to connect the pipe to an elbow, I just need to replace the solder heating head of the corresponding size, and replace two heating heads on the weld heating plate at the same time. One is used to heat the outside of the pipe and the other is used to heat the inside of the elbow. The specific heating time can be carried out according to the description of the weld or experience. After heating, Take out the pipe and elbow at the same time.