1."touch" the texture. Generally speaking, coarse particles are likely to be mixed with impurities.
2. "Look at" the color. There are mainly white, gray, and green PP-R tubes. Consumers often think that white is the best. In fact, color is not a criterion for judging quality.
3. "Smell" the smell. The main material of PP-R pipe is polypropylene. Good pipes have no odor, and poor ones have strange odors. It is likely that they are blended with polyethylene instead of polypropylene.
4. "Pinch" hardness. The PP-R tube has considerable hardness, and the tube that can be deformed at will is definitely not a PP-R tube.
Fifth, "smashing" flexibility. A good PP-R tube has good "resilience" and is easy to smash, which is naturally not a good PP-R tube. But strong hardness does not mean good elasticity. Some manufacturers increase the hardness by adding too much calcium carbonate and other impurities.
6. "Burn" the smell of smoke. The PP-R pipe mixed with recycled plastic and other impurities in the raw material 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.