Dongguan to the crown Plastic Products Co., as the temperature rises, the oxygen content of water in the PU trachea increases. Which we should consider is PU tube has a certain oxygen permeability. PU trachea oxygen permeability and therefore more pronounced. Later, pu pneumatic tube, using the oxygen barrier of PU trachea become the main solution to the problem of gas permeable tube PU, PU trachea application standards in Germany was subject to a hot water pipe at 40 degrees Celsius, the oxygen permeability of not more than 0.1mg / ( L · day), and the standard detection methods oxygen barrier properties. In China, the relevant departments for reasons of technology and production costs and other factors, whether the hot water system must use an oxygen barrier PU trachea and not mandatory. At present, the practice of application of the oxygen barrier PU trachea, the transparent pu tube, PU trachea that occurs only in some high-end building heating system. PU is a polyurethane, pu, PU leather skin polyurethane component is now widely used clothing manufacturers such materials production of clothing, leather clothing .PU is commonly known in English ploy urethane abbreviation polyurethane chemistry Chinese name their quality is also good and bad, good use more imported PU leather bag; PU with leather is generally its opposite is the second layer of skin leather material, the surface coated with PU resin, also known as foil leather. Its price is cheaper, high utilization. It varies with the process is also made of various grades of species, such as imported leather floor, because of the unique technology, stable quality, pu vacuum tubes, variety of new features, the current high-grade leather, price and grade of no less than the first layer of the dermis. PU leather and leather bags have their own characteristics, PU bag looks beautiful, good care, lower prices, but do not wear, easy to break; leather is expensive, take care of the trouble, but durable. light guide tube _ pu pu tube made multi-standard (certified) _pu provided by the Dongguan City, the crown plastic products Limited. Dongguan City, the crown Plastic Products Co., Ltd. (www.gddgyg.com) Dongguan, Guangdong, wire, tube, leader board manufacturing equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. Plastic pipe crown in the leadership with the staff warmly welcome all inquiries negotiations to create the crown Plastic pipe a better future.