Unplasticized polyvinyl chloride is a solid, versatile material that is resistant to a large number of chemicals. UPVC is a tough, sinewy, transparent and hard-wearing material, but it is very resistant to the influence of the atmosphere, moisture and chemicals, has excellent electrical properties and low flammability. Tubes and fittings made of UPVC are suitable for installation in and out of the soil. This material is resistant to aggressive environments – caused by natural phenomena or industrial outbreaks. It is also resistant to all kinds of corrosion. Chlorinated polyvinyl chloride (PVC) is a thermoplastic made by chlorinating the polyvinyl chloride resin. It is resistant to degradation and provides a long life span of use. In fact, the first pipeline systems used by the CPVC occurred in 1959, and they continue to work without any problems. CPVC is additionally chlorinated PVC. The chlorine bonded to the carbon atoms of the pre-chlorinated PVC contains 65-67% chlorine, which is 7% more than UPVC.