Taking the high-density polyethylene XL-1800 offered by LG Chemical from South Korea as raw materials, the cross-linked polyethylene (PE-Xa) pipes of Shandong Ritai Pipe Group make cross-linked polyethylene chains to from chemical covalent bond, so that molecules form a three-dimensional network structure with excellent high temperature resistance, pressure resistance, and other physical performance. It has become the first choice of floor heating system because of its high cost performance.