⒈ physical properties of PVC thermoplastic resin-based amorphous structure. Under ultraviolet light, rigid PVC to produce white light blue or purple fluorescence, soft PVC is issued blue or blue-white fluorescence. Temperature at a refractive index of 1.544 at 20 ℃ pvc plastic pipe, a specific gravity of 1.40, while the product density with plasticizers and fillers and is generally in the range of 1.15 to 2.00, soft PVC foam density of 0.08 to 0.48, a rigid foam Plastic from 0.03 to 0.08. PVC water absorption of not more than 0.5%. Physical and mechanical properties depend on the content of the molecular weight of polyvinyl chloride resin, a plasticizer and fillers. The larger molecular weight resin, the mechanical properties, cold resistance, higher thermal stability, but also require high processing temperatures, the molding difficult; the molecular weight is low, the opposite to the above. Pvc plastic filler content increased shaped pipe, the tensile strength decreased. ⒉ softening point close to the thermal properties of the decomposition temperature of the polyvinyl chloride resin. It has begun to decompose at 140 ℃, the decomposition at 170 ℃ when more quickly. In order to ensure the normal molding process, PVC resin provides for the two most important process indicators, namely the decomposition temperature and heat stability. The so-called decomposition temperature is the temperature when a large number of release hydrogen chloride, the so-called heat stability is at a certain temperature conditions (typically 190 ℃) is not a lot of time to release hydrogen chloride. PVC 100 ℃ under long-term exposure to, unless you add an alkaline stabilizer, or will decompose plastic pvc pipe manufacturer, if more than 180 ℃ the rapid decomposition. PVC plastics are synthesized by acetylene gas and hydrogen chloride, and then polymerized. In the early 1950s, based on the production of calcium carbide acetylene, 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 plastic pvc pipe processing in 2003, the result of soaring oil prices, but the cost of calcium carbide acetylene lower than about 10% ethylene oxide method, so PVC synthetic process turned the acetylene carbide method. Plastic pvc pipe prices, plastic pvc pipe, sea Widex Widex provided by Qingdao Rubber Material Co., 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!