PP-R pipe, how to identify performance 
 "Smell" the smell of 
 PP-R pipe material is polypropylene, a good pipe does not smell, poor smell is likely to be blending a polyethylene instead of polypropylene; 
 "Pinch" hardness 
 PP-R pipe has considerable hardness, casually can pinch the deformation of the tube, is certainly not of PP-R pipe; 
 "Quantity" wall thickness 
 In addition to measurements with a vernier caliper, and the tube wall thickness is standard and uniform, the general good tubes are produced strictly according to GB, but this method requires a certain understanding of the national standard PP-R pipe. 
 "Listen to" sound 
 PP-R pipe landing sound more boring, pseudo-PP-R pipe landing sound more crisp. 
 "Smashing" flexible 
 Good PP-R pipe, resilience, easy to smash the natural is not good PP-R pipe, but the temperature below 10 degrees even the best PP-R pipe can be smashed. But hardness does not equal good elasticity, some manufacturers add too much calcium carbonate and other impurities to improve the hardness, how drop is not broken, with a long easy to brittle fracture; (due to the cold brittleness of PP-R materials performance in several temperature range different: 10, -5, -23 ...) 
 "Burn" smoke odor 
 The raw material mixture of recycled plastic and other impurities in the PP-R pipe black smoke, a pungent odor. Not only not good material burning black smoke, odorless, burning, melting liquid is still very clean. (Also "pull" to see it pull "length") 
 "Melt" 
 PP-R pipe fusion, normal welding temperature in the range of 260-290 ℃, temperature welding, weld quality will be better guaranteed, if the normal parameters of welding, welding products can easily enter the welding die. and welding the accumulation of tumor close to the description of the liquid product is not authentic PP-R materials, welding at the same time accumulation of the tumor quickly cools and hardens (usually 10 seconds) can also explain the product is not authentic PP-R materials production, which is one of the characteristics of PP-R is a good insulation effect, the cooling rate will naturally be slower. 
 To see whether the deformation of the pipe inner diameter, pipe fittings whether brushed, good PP-R pipe can not be brushed inside diameter is not easy deformation. 
 "Location" 
 Borrow test equipment to detect and effectively differentiate products the pros and cons. National standard specifies the test requirements of several very important data, such as pipe anti-aging test (in the ring stress is 1.9MPa, the test temperature of 110 ° C, to maintain does not fail the test of 8760 hours), and stability testing of piping systems (hot and cold cycle 5000) and resistance to impact test, so the user in the selection of when to require manufacturers or merchants to provide the above test reports to verify. In addition need to be raised is the national standard pipe, pipe fittings by the use of raw materials, an important requirement is the melt index of national standards requirements before and after the value of processing melt index changes in the value of not more than 30 percent, but the industry also have a requirement is the raw material melt index can not be greater than 0.5g/10min. 

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