The white Danfoss FH composite pipe is 100% imperviousto air, temperature resistant and highlyflexible. It consists of an aluminum pipe which iscovered inside and out with a Polyethylene (PE-RT)layer. All layers are permanently bonded with eachother through a layer of adhesive.The octene side chains of the molecular structureof the PE-RT give it a similar effect to that of thecross-linked PE, which provides excellent Long TermHydrostatic Strength at high temperature withoutcrosslinking the material.The Danfoss FH composite pipes are manufacturedin such a way that the aluminum layer preventsthe pipe from going back to its original form. Thismakes the pipes easy to install and the aluminumcore ensures a long lifetime of your floor heatinginstallation due to oxygen tightness.The Danfoss FH composite pipe is used, in accordancewith ISO 21003