ppr管為什么會有低溫脆性的特點？它是由單體和少量乙烯單體在加熱、加壓和催化劑作用下無規共聚得到的。乙烯單體隨機地分布到長鏈中，其中乙烯單體一般控制在3-5%之間。乙烯含量和乙烯與的聚合方式決定了其具有低溫脆性的特點。
why does ppr pipe have the characteristics of low temperature brittleness? it is obtained by random copolymerization of monomer&a small amount of ethylene monomer under heating， pressure&catalyst. ethylene monomer is randomly distributed in long chain，ðylene monomer is generally controlled between 3-5%. the content of ethylene&the polymerization of ethylene determine its low temperature brittleness.ppr管雖然熔焊簡捷，但是在加熱后，準確快速地把持管件的方向不容易掌握。因為管子和管件加熱軟化后，連接時間很短，獨立采暖常采用小管徑的管子，只留有約3 - 4秒的時間，杭州pvc管業，要想在這樣短的時間里將管件例如三通、彎頭矯正不容易。
although the fusion welding of ppr pipe is ---， it is not easy to grasp the direction of pipe fitting accurately&quickly after heating. because the connection time of pipes&fittings is very short after they are heated&softened， small diameter pipes are often used for independent heating， which only takes about 3-4 seconds. it is not easy to correct the fittings (such as tee&elbow) in such a short time.
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