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 conventional identification methods are generally grouped into the following three categories, namely: identification (1) combustion method: softening or melting temperature range: 75 ~ 90 ° C; combustion conditions: self-extinguishing after ignition; combustion flame Status: under yellow green smoke ; away from the fire situation: from the fire goes out; Odor: pungent smell. This method is the most convenient and direct pvc pipe shaped product, usually as the first choice. (2) solvent treatment Identification: Solvent: tetrahydrofuran, cyclohexanone pvc shaped pipe price, ketone, dimethylformamide; non-solvent: methanol, acetone, heptane. PVC suspected by the above solvent is added pvc plastic shaped pipe, dissolution was observed to determine whether the plastic is PVC. After the solvent is heated to dissolve the effect will be more pronounced. (3) the proportion method: PVC specific gravity of 1.35 to 1.45, usually about 1.38. By gravity method for determining the proportion of the difference or distinction between PVC and other plastics. pvc pipe products _ shaped sea Widex (certified) _pvc shaped pipe 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.