The Danfoss PEXa pipe is a high quality floor heating pipe with an EVOH oxygen barrier. All layers are permanently bonded with each other during the production process. PEX-a (peroxide) pipes give greater flexibility than PEX pipes cross-linked by other systems. They can be cold bent and curved very easily and without special tools, saving joints and installation time. The EVOH oxygen anti-diffusion barrier is a thin layer of ethylene vinyl alcohol copolymer which prevents permeability of the pipe to oxygen diffusion. This construction eliminates problems with addition of oxygen to the flow water and the resulting corrosion of metal parts in the installation, extending the working life of the whole installation. 5-layer piping made of cross-linked polyethylene and produced by the peroxide method, with oxygen anti-diffusion barrier, according to the requirements of European standard EN 1264-4. Pipe cross linking degree >70 % according to ISO 15875.