From the birth of floor heating to the present, there are several types of pipes used as floor heating pipes.

XPAPR: Cross-linked aluminum tube

PE-X: cross-linked polyethylene 1

PAP: Aluminum-plastic composite pipe 2

PP-B: Impact copolymerized polypropylene (formerly known as PP-C in Korea)

PP-R: random copolymer polypropylene

PB: polybutene (super high temperature pipe)

PE-RT:: high temperature resistant polyethylene

Note 1: Cross-linked polyethylene is divided into peroxide cross-linking (PE-Xa), silane cross-linking (PE-Xb), electron beam cross-linking (PE-XC) and azo cross-linking (PE-Xd) according to the production method. ) Four. Among them, peroxide cross-linking and silane cross-linking are two kinds of cross-linked polyethylene pipe products commonly used in China.

However, peroxide cross-linking is not widely used due to excessive oxygen permeation. Silane cross-linking is toxic due to cross-linking silane. 2004 Europe is banned. Electron beam cross-linking (PE-XC) is a physical method to change the molecular structure, healthy and environmentally friendly pipe. Azo cross-linking (PE-Xd) is in an experimental state.

Note 2: There are three types of aluminum-plastic composite pipes on the market, PE/AL/PE; PE/AL/XPE; XPE/AL/XPE. The first one is polyethylene in the inner and outer layers, the second inner layer is cross-linked polyethylene, the outer layer is polyethylene, the third is cross-linked polyethylene in the inner and outer layers, and the middle layer is aluminum. The first type is generally used for cold water piping systems, and the latter two are generally used for hot water pipes, which can be used as floor heating pipes.