PE pipes for water supply are the replacement products of traditional steel pipes and PVC drinking water pipes.

The water supply pipe must bear a certain pressure, usually a PE resin with a large molecular weight and good mechanical properties, such as HDPE resin, should be used. LDPE resin has low tensile strength, differential pressure resistance, 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 their melt index can be selected in a wide range, usually MI is between 0.3-3g/10min.