PEX EVOH Oxygen Barrier Pipe for Underfloor Heating

PEX pipe upgraded with an integrated EVOH layer provides a effective oxygen barrier that almost entirely prevents atmospheric oxygen permeation through pipe walls over the system's lifetime. Keeping damaging oxygen out is crucial for radiant heating system reliability and longevity.

EVOH is short for ethylene-vinyl alcohol copolymer, and EVOH is the most widely used high barrier material.EVOH is characterized by excellent gas barrier and excellent processability, in addition to excellent transparency, gloss, mechanical strength, scalability, wear resistance, cold resistance and surface strength.

Due to its excellent performance, EVOH is widely used in many industries. EVOH is a non-toxic environmentally friendly material, in the specific processing links, will not produce toxic and harmful substances, and also has excellent barrier property, oil resistance, chemical corrosion resistance and transparency, as well as strong antistatic properties, so it is widely used in fuel tanks, and air barrier related materials and other fields.

The effective barrier of oxygen plays a crucial role in the water cycle radiation heating system. Industrial and domestic water contains trace elements such as chlorides, minerals, and dissolved atmospheric gases that interact with the metals in the pipes, where the trace elements and metals have electrical and chemical interactions that slowly erode the copper, aluminum, and even stainless steel components in the pipe systems, heat exchangers, and manifoldblocks from the inside out. Small but measurable corrosion byproducts accumulate in the water and deposit on the pipe wall, gradually reducing the pipe flow rate and heat transfer over time, while the internal bacteria and microorganisms in the pipe form a sedimentary layer on the pipe wall and gradually harden, resulting in a continuous reduction in the pipe inner diameter. This situation will lead to the operating effect of the floor heating system greatly reduced. Usually, we will flush the floor heating radiation coil with water through some washing equipment, although most of the soft components can be washed away, even if the circulating water looks clear after the pipe is flushed, but the accumulated sediment is still attached to the inner wall of the pipe.

The production of pipes with an oxygen barrier layer (EVOH) is relatively complex because it involves whether the pipe has a 3 - or 5-layer structure. Generally speaking, the 3-layer structure of the oxygen blocking tube, the oxygen blocking layer will be coated in the outermost layer of the pipe. On the one hand, as a material of oxygen blocking layer, the oxygen blocking ability of this resin will be greatly reduced after being affected by wet environment; On the other hand, the harsh environment of the floor heating construction site or the operation of dragging and other easy to scratch the surface of the pipe, so that it can not achieve the purpose of preventing oxygen. The 5-layer structure of the oxygen blocking pipe, the oxygen blocking coating is located in the middle of the pipe, and the use of a co-extrusion molding process, the production requirements of the extrusion equipment is relatively high, the overall cost is higher than the 3-layer structure of the oxygen blocking pipe. In order to reduce the adverse effect of high oxygen permeability on the entire radiation system, it is recommended to use 5 layers of PEX-EVOH at the beginning.

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