5. Measure thickness
In addition, you can use a vernier caliper to measure whether the wall thickness of the pipe meets the standard and is uniform. Generally, good pipes are produced in strict accordance with the national standard, but this method requires a certain understanding of the national standard for PP-R pipes.
6. Listen the sound
The sound of PP-R pipe landing is dull, and the sound of pseudo PP-R pipe landing is clearer. 6. Smashing
A good PP-R pipe has good resilience. It is naturally not a good PP-R pipe If easy to smash, but you need to know that even a good PP-R pipe can be smashed if the temperature is lower than 10 degrees. The strong hardness is not equal to good elasticity. Some manufacturers increase the hardness by adding too much calcium carbonate and other impurities, and it will not break, but it will be brittle after a long time.
7. Burn smoke smell
The PP-R pipe mixed with recycled plastic and other impurities in the raw material When you set it on fire it will emit black smoke and have a pungent odor. After a good material is burned, it will not emit black smoke and odorless. After burning, the molten liquid is still very clean.
8. Melt
When the PP-R pipe is welded, the normal welding temperature is within the range of 260-290℃, and the welding quality will be better guaranteed during this temperature range. If the normal welding parameters are used, the product can easily enter the welding die during welding. And the welding accumulation tumor is close to the liquid state, indicating that the product is not made of authentic PPR raw material, and if the welding accumulation tumor can be quickly cooled and hardened (usually within 10 seconds), it can also indicate that the product is not an authentic PP-R raw material. It is produced because one of the characteristics of PP-R is that it has better heat preservation effect, and its cooling rate will naturally be slower. And check whether the inner diameter of the pipe is deformed and whether the pipe fittings are drawn. A good PPR pipe cannot be drawn, and the inner diameter is not easily deformed.