How to distinguish the quality of PPR pipe

“look” appearance

Color, good PP-R water pipe is soft and uniform, no mottling. (PP-R pipes are mainly white, gray, green and yellow. Consumers often think that white is ppr pipe.

In the best, the color is not the standard for judging the quality. In fact, the quality of the PP-R water pipe has nothing to do with the color of the PP-R water pipe. The plastic particles are mainly white and transparent (other colors have been added to the color masterbatch). As long as the color masterbatch can be produced, the color masterbatch will not be decomposed or change the PP-R quality. It doesn’t matter what color is. According to the national regulations, PP-R water pipes should have good light-closing performance. In this regard, gray or other opaque properties will be better. However, this advantage exists only in the installation of the tube and the pipeline well, and the water pipes in the home are all buried, so there is no such thing as gray is better than other colors. The PP-R tube is completely opaque, and the pseudo PP-R tube is slightly transparent or semi-transparent. White products can only be produced from pure PP-R raw materials. For example, the products produced by adding recycled materials, scraps, and corner materials are not soft or uniform in color, and other color products processed by masterbatch are added with recycled materials, scraps, and corners. The material will not affect the color of the product. This is why many manufacturers who focus on quality and focus on home improvement retail are mainly white); the inner and outer surfaces of the product should be smooth and flat, and no defects such as bubbles, obvious depressions, grooves and impurities are allowed.

“touch” texture

100% of the good PP-R water pipe is PP-R raw material (without any additives). The texture is pure, the surface is smooth, the hand feel is soft, and the pseudo PP-R pipe feels smooth. Generally speaking, the coarse particles are likely to be mixed with impurities;

“smelling” smell

The main material of the PP-R pipe is polypropylene. The good pipe has no odor, and the poor one has a strange smell. It is likely to be blended with polyethylene instead of polypropylene.

“Pinch” hardness

The PP-R tube has a considerable hardness, and the tube that can be pinched and deformed casually is definitely not a PP-R tube;

“quantity” wall thickness

In addition, the caliper can be used to measure whether the wall thickness of the pipe is up to standard and uniform. Generally, the good pipes are produced strictly according to the national standard, but this method requires a certain understanding of the national standard of PP-R pipe.

“listen” sound

PP-R pipe landing sound is more dull, pseudo PP-R pipe landing sound is crisper.

“break” elasticity

A good PP-R tube, “rebound” is good, easy to smash naturally is not a good PP-R tube, but the PP-R tube can be smashed if the temperature is lower than 10 degrees. However, the hardness is not equal to the elasticity. Some manufacturers increase the hardness by adding too much impurities such as calcium carbonate. How can it be broken? It is easy to be brittle after a long time; (due to the cold and brittleness of PP-R raw materials in several temperature ranges) Different: 10, -5, -23…)

“burning” smoke smell

The PP-R tube, which is mixed with recycled plastic and other impurities, emits black smoke and has a pungent odor. After burning a good material, not only will it not emit black smoke or odor, but after burning, the molten liquid will still be very clean. (Also you can “pull” and see its pull “length”)


When the PP-R pipe is welded, the normal welding temperature is in the range of 260-290 °C. The welding quality will be better guaranteed when welding in this temperature range. If the welding is performed under the normal welding parameters, the product can easily enter the welding die. And the fusion deposited tumor is close to the liquid, indicating that the product is not produced by authentic PP-R raw materials. At the same time, if the fusion bonded tumor can be cooled quickly and hardened (usually within 10 seconds), the product is not an authentic PP-R raw material. Produced, this is because one of the characteristics of PP-R is that the insulation effect is better, and its cooling rate will naturally be slower.

Look at whether the inner diameter of the pipe is deformed, whether the pipe is drawn, the good PP-R pipe is not allowed to be drawn, and the inner diameter is not easily deformed.


The use of test instruments for testing effectively distinguishes the advantages and disadvantages of the product. Several nationally important test requirements data are specified in the national standards, such as pipe aging resistance test (test with a ring stress of 1.9 MPa, test temperature of 110 ° C, which does not fail for 8760 hours), and piping system stability test (cold heat) 5,000 cycles) and impact resistance test, etc., so users can ask the manufacturer or merchant to provide the above test report for verification. In addition, it is necessary to put forward that the national standard also has an important requirement for the raw materials used for pipes and fittings: the melt index. The national standard requires that the melt index change value before and after processing cannot exceed 30%, and there is also a requirement in the industry that the raw material melt index cannot be More than 0.5g/10min.

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