Polyethylene (PEX) – a synthetic polymer. PEX plumbing tubing are successfully used for transporting liquids for more than 40 years old.
In water, heating and plumbing for the manufacture of pipe and fittings, the following types of PEX:
* Low Density Polyethylene (PEX-b, the second name of high pressure polyethylene) – lightweight flexible crystallized material with heat-load to 60 ° C (for some brands up to 90 ° C). Allow cooling (different brands range from -45 ° C to 120 ° C). Properties depend strongly on the density of the material. The increase in density leads to increased strength, stiffness, hardness, chemical resistance. At the same time with increasing density decreases impact resistance at low temperatures, elongation, fracture toughness, permeability to gases and vapors. It is apt to crack under increasing load. Not fluctuate between sizes. It has excellent dielectric properties. It has a very high chemical resistance. It features high resistance to radiation. Biologically inert.
PEX Plumbing tubing apply for external and internal systems for household and drinking plumbing, irrigation, ventilation, as well as systems transporting other liquids and gases, to which polyethylene is chemically resistant.
* High Density Polyethylene (PEX-a, second name: low-pressure polyethylene) – easy elastic crystallized material with heat resistance of individual brands to 110 ° C. Allow cooling to -80 “C. Melting point marks: 120-135 ° C. Characterized by good impact resistance and greater heat resistance as compared with pe. There was a high creep under prolonged load. It has a very high chemical resistance (more than pe). It has excellent dielectric properties. Biologically inert.