According to the different production processes of cross-linked polyethylene pipes, it can be divided into peroxide cross-linking (PE-Xa), silane cross-linking (PE-Xb) peroxide cross-linking (PE-Xa): developed in the 1970s out of the production process. Peroxide cross-linking is that the peroxide mixed into polyethylene is decomposed into free radicals during the extrusion process, causing the polyethylene polymer chain to form active free radicals and cross-linking. ,
Silane crosslinking (PE-Xb): In 1973, Dow Corning developed silane crosslinking technology, which uses vinyl silane containing double bonds under the action of an initiator (usually peroxide) to polymerize with melting In the presence of a silanol condensation catalyst, the polymer is hydrolyzed in the presence of water, thereby forming a network-like siloxane bond cross-linked structure.