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PE-X
Domestic production generally adopts medium-density polyethylene or high-density polyethylene and silane crosslinking or peroxide crosslinking. It is to connect chemical bonds between the linear long molecular chains of polyethylene to form a three-dimensional network molecular chain structure. Compared with ordinary polyethylene, it has improved properties such as tensile strength, heat resistance, aging resistance, stress crack resistance and dimensional stability. The whole production process belongs to the chemical reaction process. This type of floor heating has difficulties such as cross-linking agent is not easy to disperse evenly, cross-linking degree is difficult to control uniformly, and the screw needs to be cleaned regularly to prevent gel particles. Qualified PE-X pipes have the advantages of good mechanical properties, high temperature resistance and low temperature performance. However, PE-X pipes have no thermoplastic properties and cannot be connected and repaired by hot-melt welding.
PB
Known as the soft gold in plastics, it has superior creep resistance and mechanical properties. It is the softest among several kinds of floor heating pipes, and the design calculation wall thickness is the thinnest under the same design pressure. Under the same conditions of use, pipes of the same wall thickness series have the highest safety in use. However, the price of raw materials is the highest, more than double that of other varieties, and the current application area in China is relatively small. In the future, the market will slowly popularize this kind of pipe.
PE-RT
The raw material for floor heating is a medium-density polyethylene with very stable mechanical properties, which is formed by metallocene-catalyzed copolymerization of ethylene and octene monomers. Its unique ethylene main chain and octene short branched chain structure make it have the superior toughness, stress crack resistance, low temperature impact resistance, outstanding long-term water pressure resistance and octene thermal creep resistance of ethylene.
