IFAN Hot Popular PEX-EVOH Pipes

Definition of PEX-EVOH pipes

PEX-EVOH pipes are cross-linked polyethylene pipes with an oxygen barrier. This barrier prevents oxygen from entering the pipe. The technology protects metal system components from corrosion. Example: a pipe used in a radiant floor heating system.

What does EVOH stand for?

EVOH stands for Ethylene Vinyl Alcohol. It is a copolymer with excellent gas barrier properties. It is applied as a thin layer on the pipe exterior. PEX-EVOH pipes use this layer for protection.

The purpose of the EVOH layer

The EVOH layer limits oxygen permeation through the pipe wall. In closed-loop heating systems, oxygen causes metal corrosion. The barrier reduces this risk significantly. PEX-EVOH pipes extend the life of boilers and radiators.

How the pipe is constructed

PEX-EVOH pipes are typically multi-layer structures. A standard design has five layers. The EVOH layer is in the middle or on the outside. PEX-EVOH pipes have layers bonded permanently together.

Why the barrier is needed

All plastics have some gas permeability over time. Oxygen can penetrate PEX pipe walls. This oxygen then corrodes ferrous metal parts. PEX-EVOH pipes solve this problem effectively.

Example: hydronic heating system

A boiler heats water for a radiant floor system. The system has metal pumps and valves. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes prevent oxygen from reaching these parts. The system runs cleaner and lasts much longer.

Example: underfloor heating installation

A new home has radiant floor heating throughout. The installer chooses Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes for the job. The pipes are embedded in concrete slabs. The EVOH barrier protects the entire system long-term.

Common applications

Radiant in-floor heating is the primary application. Hydronic heating systems also use them. They are suitable for solar water heating too. PEX-EVOH pipes are used in residential and commercial buildings.

Other uses for EVOH barrier pipes

EVOH pipes are also used for gas supply systems. They protect drinking water in contaminated soil. They are used in pre-insulated district heating networks. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes are part of a broader EVOH pipe family.

Standards and certifications

PEX-EVOH pipes must meet specific standards. DIN 4726 covers oxygen barrier requirements. ISO 15875 is another relevant standard. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes from reputable brands are certified to these.

PEX types and crosslinking methods

PEX-EVOH pipes can be PEX-A, PEX-B, or PEX-C. PEX-A is made using the peroxide method. PEX-B uses silane for crosslinking. PEX-EVOH pipes are available in all crosslinking types.

Final summary

Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes are PEX pipes with an EVOH oxygen barrier. EVOH stands for Ethylene Vinyl Alcohol. The barrier prevents oxygen from entering closed-loop heating systems. This protects metal components from corrosion. The pipes are multi-layer, with the EVOH layer as the key feature. They are widely used in radiant floor and hydronic heating. They meet DIN 4726 and ISO 15875 standards. Example: a reliable choice for long-lasting heating systems.

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