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 after 2003, due to soaring oil prices, but also the cost of calcium carbide acetylene about 10% lower than the vinyl plastic PVC profile manufacturer oxidation, so PVC synthetic process turned the acetylene carbide method. 1. Soft polyvinyl chloride containing a plasticizer is generally 30-50%. Because of soft, high strength; has good air tightness and impermeability. 2. Rigid PVC is only a small amount of a plasticizer. Its characteristic is a hard plastic PVC profile products, high mechanical strength, good chemical resistance. . 3. PVC poor heat resistance, strength influenced by temperature, -20 ℃ 20 ℃, when the intensity ratio dropped to 80%. Therefore, the film is not easy to keep products at low temperature; soft products temperature does not exceed 45 ℃, hard products does not exceed 60 ℃, the light will be long-term aging embrittlement. 4. PVC plastic film serves in the processing of PVC profiles, in order to prevent thermal decomposition, thermal stabilizer to be added, since the heat stabilizer contains lead salts, so that the PVC toxic plastic PVC profiles, it can not be used as food packaging . 5. PVC pest control agent in contact with the organic solvent and naphthalene, etc., will produce sticky, melting phenomenon, and easy to absorb odors; more volatile due to the plasticizer, it should not be stored for too long. Qingdao plastic PVC profiles, sea Widex (certified), plastic PVC profiles 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.