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 Subsurface drip, drip irrigation is embedded in the active layer of the underground root crops, irrigation water through the pores into the soil for crop uptake. In some places separated a certain distance in the plastic pipe to drill a small hole ring Qi plastic cpvc, buried underground near the roots of the plants were irrigated Central Qi plastic pipe fittings, people commonly known as "subsurface irrigation." Subsurface drip irrigation has less evaporation loss, water, power, and fertilizer, labor and yield significant benefits, etc., fruit, cotton, crops etc. can be used. The disadvantage is that when large irrigation pipe spacing is not uniform, should not be used in large or steep ground where the soil permeability. Acres for 400 yuan -1000 yuan investment. Its benefits are: water-saving 50% -60%; saving 40% -50%; yield about 30%. China PVC plastic flame retardant technology to study the prevalence of that tendency, one-sided pursuit of improving oxygen index, ignoring research fuming performance. Statistics show that the fire is 79 percent lethal fumes. Some UPVC pipe oxygen index up more than 50%, but a large amount of smoke when burned upvc plastic ring Qi and Vicat temperature between 70 ℃ only a 90 ℃. Therefore, although the flame UPVC pipe, but easy to soften deformation, and very thick smoke ring Qi plastic, the fire, on the one hand to produce deadly gas, on the other hand, when the temperature exceeds 90 ℃ softening deformation pipeline, the fire in the pipeline crossing site spread, and through the roof drains or snorkel wind speed greater, the fire spread quickly. So, whether the application of high-rise buildings UPVC pipe, was at issue, and the focus of controversy is its fireproof properties. Central Qi plastic cpvc supplier, Central Qi plastic upvc, ring by ring Qi Qi plastic plastic. Looking for "UPVC, CPVC pipe fittings and valves, PVDF, PP valves, etc." fly suppliers, network operators choose to have a full alliance Certified: Shandong Central Qi Plastics Co. (www.hershey-sd.com), trustworthiness and reliability, Now click on the "Business Alliance Customer Service" on page live chat with us now!