Thus, polymer pipes are made of PVC ( or CPVC), PEX (PEX-b) and PP. For each material developed their own standards, since each has specific properties. For example, PEX is more resistant to high temperature, resulting in wall thickness plumbing PEX pipe diameter of 110 mm is 3.2 mm, as a PVC-pipe, and 2.7 mm.
These materials of different coefficient of thermal expansion – a key indicator of PEX tubing. PVC-U pipes less, and in PEX tube anymore. And if the hot water pipes will be used with a high coefficient of linear expansion, then for sewage systems, on the contrary, it is important that pipes were minimal deformation.
