Applications / Industrial / Pipe


EVAL™ has outstanding gas barrier properties and is resistant to chemical agents.

Pipe applications

Floor heating systems made of heating pipes of polybutene (PB), polypropylene (PP) or cross-linked polyethylene (PEX) can cause potential corrosion of the metal parts in the heating element due to the oxygen that easily permeates through the plastic pipes.

To avoid this corrosion several options can be taken:

Reducing the oxygen permeability of the pipes is the most secure and economical solution. By using a multilayer pipe made of plastic containing an EVAL™ barrier layer, the oxygen transmission rate will be reduced to a minimum and the corrosion of the metal parts in the heating system is minimised.

The gas barrier property of the EVAL™ resins prevents oxygen from permeating through the wall of the pipe and subsequently dissolving into the circulating hot water, thereby corroding metal parts in the heating element. Plastic pipes coated with an EVAL™ layer are a good alternative to copper pipes and meet the strict building standards for oxygen permeation, such as for instance the DIN 4726 in Germany, which allows a maximum oxygen gas transmission rate of 0.1g/m³ per day at 40°C or less.

Specific versions of the EVAL™ E and F types have especially been developed for this application. These special EVAL™ pipe grades contain additional anti-oxidants or thermal stabilisers to increase the long-term stability and the service life of the under-floor heating pipes.

The pipe grades of EVAL™ E and F types comply with all the requirements needed for a high-quality pipe that is used for industrial purposes.

UFH pipe

What an EVAL™ layer offers:

Typical applications

Typical structure (in / out)

Under-floor heating pipes



Processing method: