June 27, 2022
HDPE pipe is the replacement product of traditional steel pipe and PVC drinking water pipe.
HDPE pipes must withstand a certain pressure, and PE resins with large molecular weight and better mechanical properties, such as HDPE resins, are usually selected. LDPE resin has low tensile strength, resistance to pressure difference, poor rigidity, poor dimensional stability during molding and difficult connection, and is not suitable as a material for water supply pressure pipes. However, due to its high hygienic index, LDPE, especially LLDPE resin, has become a common material for the production of drinking water pipes. LDPE and LLDPE resins have low melt viscosity, good fluidity and easy processing, so the selection range of their melt index is also wide, usually MI is between 0.3-3g/10min.
High density polyethylene, the English name is "High Density Polyethylene", referred to as "HDPE". HDPE is a highly crystalline, non-polar thermoplastic resin. The appearance of the original HDPE is milky white, and it is translucent to a certain extent in the thin section. PE has excellent resistance to most household and industrial chemicals. Certain types of chemicals are chemically aggressive, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene), and halogenated hydrocarbons (carbon tetrachloride). The polymer is non-hygroscopic and has good water vapour resistance for packaging applications. HDPE has good electrical properties, especially high insulation dielectric strength, making it very suitable for wires and cables. Medium to high molecular weight grades have excellent impact resistance at ambient temperatures and even as low as -40F.
Although HDPE was introduced in 1956, the plastic has not yet reached maturity. This versatile material is constantly being developed for new uses and markets.
PE can be manufactured with a wide variety of different processing methods. These include, for example, sheet extrusion, film extrusion, pipe or profile extrusion, blow molding, injection molding and rotational molding.
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