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| PP-R (Poly Propylene Random) tube, the PP-tube, commonly used in today's developed a new type of pipe material. PP-R pipe in Europe for over 10 years of experience, because of its excellent performance, its market share in recent years, far ahead of other plastic pipe materials. China PP-R pipe production and application are also a few years, with the country to promote the application of chemical building materials, chemical building materials in China has entered a stage of industrial development, including the development of new plastic pipe re-emergence of a new upsurge in domestic hot and cold water and heating in the building almost all used PVC-C, PE-X, PP-R aluminum-plastic tubes and pipes, and gradually transition to the PP-R pipe. PP-R pipe production and application of today's hot spots. The characteristics of PP-R pipe pipe engineering gradually being recognized in China, PPR PIPE plastic pipe and have a general light weight, corrosion resistance, high strength, non-scaling, long life and other general advantages, also has clean and non-toxic , good low temperature impact resistance, long-term heat and pressure resistance, good insulation and energy-saving performance, is the real green building materials products, also has a system connection and easy installation, pipe connections are secure, and is permanent connection and so on. PP-R pipe coupled with good cost performance, and thus it from a variety of new water pipes to the fore, just a few years time to develop very rapidly, is widely used. There are currently more than 300 of PP-R pipe production plant, the existing building materials market, a variety of PP-R pipe, due to various reasons, PP-R pipe quality problems are still quite prominent, leading to the advantage of PP-R pipes and features not fully reflect the impact of the pipeline project to use features, but also to the corresponding quality of the project laid the security risk. China has been officially formulated and promulgated the GB / T18742.2 -20002 "Polypropylene piping systems for hot and cold water," the national standard, and in January 1, 2003 into effect. After the official implementation of the standard, we are under the "Polypropylene piping systems for hot and cold water Part 2: Pipes," the technical requirements of national standards, the market PP-R pipe was a comprehensive supervision and inspection, inspection results, the overall PP- R pipe quality than in the past has been improved to varying degrees, but by random distribution of business enterprises and the pass rate of 70% of the total product, of which the quality of the products distribution company only 50%, indicating that the market now PP-R pipe, the failure rate remains very high, and check the quality problems are diverse. 2006r Association of Zhejiang Province commissioned the National Chemical Building Materials Chemical Building Materials Quality Supervision and Inspection Center of Zhejiang Province, part of the pipe market has announced the results of product sampling, plastic pipe product quality of shocking. Polypropylene PP-R pipe sampling pass rate of 10%. Brief analysis of what is affecting the quality of the various factors PPR pipes: 1, PP-R pipe production of raw materials PP-R raw materials, the chemical name: propylene - random copolymer of ethylene, propylene and ethylene polymerization gas mixture, the resulting distribution of the main chain of propylene and ethylene random copolymer chains. PP-R good quality raw materials, shall comply with GB / T1888742.1 standards, a minimum strength of SMR must be guaranteed. PP-R good quality raw materials mainly from companies such as Borealis and Hostalen, providing raw materials to ensure that the value of SMR, and the tube of raw material properties of the relationship between performance and a more in-depth research, especially the overall performance of ethylene content on the tube effects. PP-R on the market today than the hybrid material grades, uneven performance, but also use very different, and some grades of PP-R material is not suitable for hot water pipes and pressure pipes, soil plus some firms Publicity not practical, easily lead to confusion in the currency field. 2, PP-R pipe and the appearance quality of ...... In accordance with national standards, qualified PP-R pipe should look to do: color should be consistent; the appearance of ICI should be smooth, flat, no dents, bubbles and other surface defects that affect performance; should not contain visible impurities. National standards for the appearance of pipe quality standards, although only a simple qualitative description of the text, but all of its qualitative indicators could reflect the intrinsic quality of pipe major. Pipe or the appearance of compliance, and products related raw materials and processing technology, so the quality not only affects the appearance of pipe pipe appearance, and the day _ of the physical and chemical properties of pipes, often determines the overall quality of pipe. Therefore, the appearance of test tubes is very important, can be "outside to the inside," the preliminary judging the overall quality of the product. |