5-Layer PE-RT EVOH Barrier pipe

The THERMALINO 5-Layer PE-RT EVOH Barrier pipe is a PE-RT pipe for water-based underfloor heating, with the EVOH oxygen barrier enclosed between an inner and an outer PE-RT layer so that it keeps oxygen out of the closed heating circuit and is protected from scratches and abrasion on site. It is supplied in red, Ø16 to Ø25 mm, in coils of 200, 500 and 600 m.

The 5-Layer PE-RT EVOH Barrier pipe in the Eternal line is a PE-RT pipe for water-based underfloor heating. PE-RT stands for polyethylene of raised temperature resistance. The pipe wall has five bonded layers: an inner PE-RT layer, an adhesive layer, the EVOH oxygen barrier, a second adhesive layer and an outer PE-RT layer. Because the barrier sits inside the wall rather than on the surface, it stays protected when coils are unrolled, pulled around corners and walked on before the screed goes down. Scratches, abrasion or peeling on the outer surface therefore do not reach the barrier. In a closed heating circuit, oxygen that passes through a pipe wall corrodes the steel and cast-iron parts of the system: the boiler heat exchanger, pumps, manifolds and radiators. This corrosion is a common source of rust and sludge in the water. The EVOH layer protects these components by limiting oxygen ingress. The pipe conforms to EN ISO 22391-2 and DIN 4726. It covers application classes 1, 2, 4 and 5, with a maximum operating pressure of 8 bar and a maximum operating temperature of 70 °C. The pipe is available in Ø16x2.0, Ø17x2.0, Ø20x2.0 and Ø25x2.3 mm, in 200, 500 and 600 m coils. With coils this long, each loop can run from the manifold supply to the return in a single length. Bends and turns are formed in the pipe itself, so the only joints are at the manifold. The pipe is fixed on clip rails, tacker systems or panel boards and connected with fittings that match its outside diameter and wall thickness. The installer pressure-tests the circuit before it is covered with screed.