Polyethylene resin is formed by polymerization of monomer polyethylene. Due to the different polymerization conditions such as polymerization pressure and temperature, resins with different densities can be obtained. Therefore, there are high-density polyethylene, medium-density polyethylene and low-density polyethylene. When processing different types of HDPE pipes, according to different application conditions, different resin grades are selected, and the requirements for extruders and molds are also different.
