PVC, the abbreviation PVC (Polyvinyl chloride polymer = PVC molecular structure) is formed by the polymerization of vinyl chloride in the role of initiator of the thermoplastic resin. Vinyl chloride homopolymer. Vinyl chloride homopolymers and copolymers of vinyl chloride resin system call. PVC is amorphous white powder, a small degree of branching. Industrial production of PVC molecular weight generally in the range of 50,000 to 120,000, with a large polydispersity, molecular weight increases with decreasing polymerization temperature; no fixed melting point, 80 ~ 85 ℃ begins to soften pvc pipe, 130 ℃ becomes sticky elastic state, 160 ~ 180 ℃ began to change for the viscous flow state; have good mechanical properties, tensile strength of about 60MPa, the impact strength of 5 ~ 10kJ / m2; has excellent dielectric properties. But for light and heat stability is poor, at above 100 ℃ or after prolonged exposure to sunlight pvc pipe manufacturers, it will break down and produce hydrogen chloride, and further autocatalytic decomposition, causing discoloration, physical and mechanical properties also decreased rapidly in the practical application stabilizer must be added to improve heat and light stability. PVC composition structure character as a slightly yellow translucent and shiny. Transparency better than polyethylene, polypropylene, polystyrene poor, with the additive, divided into soft and hard PVC, soft products soft and tough, sticky feel five pvc pipe, hard ware is harder than the low-density polyethylene, and polypropylene pvc pipe below the agency, at the inflection point appears bleaching. Common products: plates, pipes, shoe soles, toys, doors and windows, wire jacket, stationery, packaging boxes. From the early 1980s, the state vigorously promote the use of upvc pipe, and formulated a series of policies, systems, standards, and has accumulated a lot of experience. To today, already we have a sound product standards, standard detection methods and means of detection, construction engineering and technical specifications, so as to unify the standard size and quality indicators of products, and product compatibility. This shows that the development of pvc water supply pipe has entered a mature stage, product quality and construction quality are a guarantee to ensure the use of effects pvc water supply pipe. The water supply pipe pe international standard (ISO4427) officially released until 1996. Our reference in 1999 to write a national standard ISO4427 GB / T13663, and promulgated in 2000, but has standard pe pipe fittings, engineering and other technical specification continues perfected. This shows that domestic pe pipe quality has not been stable, pipe fittings matching is not perfect, and therefore can not ensure the production, construction quality. pvc pipe agents | pvc pipe | sea Widex Widex provided by Qingdao Rubber Material Co., Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) strong, credible, in Qingdao, Shandong Province industrial products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve the innovation concept and benefits of the sea will lead you hand into the brilliant, for a better future!