PVC plastics are synthesized by acetylene gas and hydrogen chloride, and then polymerized. In the early 1950s, is the production of calcium carbide acetylene pvc plastic profile standard, then turned to the late 1950s, abundant raw materials, low-cost method of ethylene oxide; the world for more than 80% of the PVC resin is produced by this method . But by 2003, the result of soaring oil prices pvc plastic profile manufacturer, but the cost of calcium carbide acetylene lower than about 10% ethylene oxide method, so PVC synthetic process turned the acetylene carbide method. PVC resin is a polymer less stable under the action of light and heat will degrade pvc plastic profile characteristics, the process is the release of hydrogen chloride pvc plastic profiles, structural changes occur, but the extent of relatively light. At the same time when a mechanical force, oxygen, odors, HCl and some of the active metal ions accelerate decomposition. Polyvinyl chloride resin after removal of HCl, produced in the main chain conjugated double stranded, the color will change. With the increase in the number of hydrogen chloride decomposition, polyvinyl chloride resin, the original white to yellow, pink, red, brown and even black. pvc plastic profile standard, pvc plastic profiles, sea Widex Widex provided by Qingdao Rubber Material Co., Ltd. Widex Qingdao Rubber Material Co., Ltd. (www.haihuidaxiangsu.com) strong, credible, in Qingdao, Shandong industrial products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the sea Widex and you work into the brilliant, for a better future!