pvc pipe identification method 1: Look at the surface finish, and whiteness. 2: Take a sample wrestling, easily broke calcium product generally is, of course, you have to comply with the requirements of the price is right, then it is possible. 3: Take a sample with side foot pipe, see if you can crack or split after breaking elongation. (Generally you have to try to put a good set of lines, ha ha, otherwise people can not let you step on) 4: weather terms. The most direct way is to get a high-Wen Gaoguang place to put a few days, look at the surface chemical changes in the rate of pvc pipe, but a waste of time. Mainly to see the former three like. Affect the quality of pipe materials and equipment and pipelines. These factors in the domestic and foreign manufacturers are the same. PVC is the biggest characteristic is flame retardant, so it is widely used in fire protection applications. But PVC in the combustion process releases hydrogen chloride and other toxic gases, such as dioxins. PVC combustion in two steps. First at 240 ℃ -340 ℃ combustion and decomposition of hydrogen chloride gas having a double bond diolefin, and then combustion of carbon occurs at 400-470 ℃. It is one of the world's largest production of plastic products, cheap, widely used in polyvinyl chloride resin is white or pale yellow powder. Depending on the use of different additives can be added, PVC can exhibit different physical and mechanical properties. Adding an appropriate amount of plasticizer in PVC resin can be made from a variety of hard, soft and transparent products. Pure PVC density 1.4g / cm3, adding plasticizers and fillers, such as the density of PVC plastic is generally 1.15-2.00g / cm3. Rigid PVC has good tensile, flexural, compressive strength and impact resistance, can be used as structural materials alone. Soft PVC softness, elongation at break, cold resistance will increase pvc pipe, but the brittleness, hardness ,, tensile strength is lowered. PVC has good electrical insulation properties, can be used for low-dielectric material, its chemical stability or. Due to poor thermal stability of PVC, prolonged heating can cause decomposition and emit HCL gas, discoloration of polyvinyl chloride pvc pipe works, so its narrow range of applications, the use temperature is generally between -15 ~ 55 ℃. PVC resin is a polar non-crystalline polymers, density: 1.380 g / cm, glass transition temperature: 87 ℃, and therefore poor thermal stability, difficult processing. Can not be used directly, must be modified mixed, add the relevant additives and fillers can be used. And because of different additives and added to the relevant type and filler fraction, which determines the material properties and the requirements of PVC prepared is not the same. We usually call it PVC formulations pvc pipe prices, strictly speaking is modified PVC formulations, but only after a modification to use PVC. This category is often classified as a polymer modified materials. Studies of polymer materials modified plastics primarily focus on high performance general-purpose, single-component materials to the multi-component composite material change (alloys, blends, composites), giving the material functions, optimization of performance and price and so on. Modified method is mainly chemical modification, filling modification, enhancement modification, blending modification and nano-composite modified. The basic principle is modified by providing material additives function or enhance certain properties. Therefore, compete with PVC formulation technology, determines a plant technology and production capacity to compete. pvc pipe production line _ sea Widex (certified) _pvc tube provided by Qingdao Rubber Material Co., Widex. Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) is Qingdao, industrial products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Widex leadership in the sea with the staff warmly welcome all inquiries negotiations to create sea Widex a better future.