Qingdao pvc plastic pipe, sea Widex (certified), pvc plastic pipe provided by Qingdao Rubber Material Co., Widex. Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) is specialized in "PVC profiles, seals, ABS extrusion profiles, PVC raw material" of the enterprise, the company of "honesty, hard service" concept, for You provide the most quality products and services. Welcome to inquire! Contact: Zhao Shuang. According to the method of obtaining vinyl chloride monomer to distinguish, can be divided calcium carbide, ethylene and imported (EDC, VCM) monomer law (customary law of the ethylene monomer and import laws collectively known as ethylene). According to the polymerization method, PVC can be divided into four categories: suspension PVC, polyvinyl chloride emulsion, bulk PVC, polyvinyl chloride solution. SPVC is one of the largest varieties of production, accounting for about 80% PVC total. pvc identification may also be determined by measuring the material to determine whether it contains chlorine, but because the vinyl chloride copolymer, polychloroprene, polyvinylidene chloride, chlorinated polyvinyl chloride and so contains a higher proportion of chlorine, but also the color by pyridine reaction to identify. Note that, before the test, the sample must be extracted with ether to remove the plasticizer, Test method: take over from ether benzene sample was dissolved in tetrahydrofuran pvc plastic pipe prices, the insoluble components, methanol was added for precipitation, and extraction below 75 degrees after the former dry. The dried small sample need not react with 1ml of pyridine pvc plastic tube, after a few minutes pvc plastic pipe, the scene was added 2 drops of 5% methanol solution of sodium hydroxide (1g sodium hydroxide was dissolved then 20ml of methanol), Now look at the color, 5min and 1h were once again observed. Identification of different colors according to the chlorine plastic.