In the previous period, PP-c pipes and fittings appeared in the domestic market, and their installation methods were consistent with pp-r. Many people don't know the difference between PP-R and PP-c, resulting in many misunderstandings and confusion. In the international standard, polypropylene cold and hot water pipes are divided into pp-h, PP-B and PP-R, without pp-c. The difference between the three PP pipes is that the stiffness of pp-h, PP-B and PP-R pipes decreases in turn, and the impact strength increases in turn.
Among the three kinds of PP pipes, the impact resistance of pipes is PP-R > PP-B > pp-h, the thermal deformation temperature of pipes is pp-h > PP-B > PP-R, the rigidity of pipes is pp-h > PP-B > PP-R, the bursting temperature of pipes at room temperature is pp-h > PP-B and PP-R, and the chemical corrosion resistance of pipes is pp-h >PP{{0}}B ak pp-r. Konpare ak lòt tiyo PP, avantaj eksepsyonèl PP-R tiyo se ke li pa sèlman amelyore frajil tanperati ki ba -p-h, men tou li gen bon tan{{5. }}tèm rezistans presyon dlo nan tanperati ki pi wo (60 degre), espesyalman lè yo itilize pou tiyo dlo cho, fòs alontèm -pi bon pase pp-h ak pp{{ 9}}b. 1 PP-c tiyo sou mache a se aktyèlman PP-B tiyo, ak materyèl bwit li yo se materyèl espesyal pou blòk copolymerized tiyo polypropylène. PP-B tiyo se yon kalite tiyo dlo frèt ak cho, ki relativman bon mache, ak rezistans chalè li yo ak rezistans presyon yo trè diferan de pp-r. Pou egzanp, kondisyon sèvis yo klase kòm 2, presyon konsepsyon an se 0.6MPa, epesè miray la nan tiyo dn25mm, PP-R tiyo se 3.5mm, ak epesè miray la nan PP-B ( PP-c) tiyo se 5.1mm; Presyon konsepsyon an se 0.8MPa, dn25mm, epesè miray PP-R tiyo a se 4.2mm, epi PP-B (PP-c) pa ka itilize. Paske epesè miray ki nesesè a twò epè. Tiyo PP-c ak menm estrikti ak menm gwosè ak PP-R nan mache a gen kondisyon sèvis ki pi ba yo epi yo pa ka melanje ak tiyo PP-R, alewè ranplase PP{ {37}}R tiyo ak PP-c tiyo apre yo fin detèmine kondisyon sèvis yo. Kondisyon sèvis 2 endike ke tanperati konsepsyon an se 70 degre pou dlo chofaj.
