For the convenience of the installer, Interplast offers the Como-pex pipe within the corrugated pipe (Pipe in Pipe) in the following diameters.
TABLE OF DIMENSIONS
Corrugated pipe
Como-pex
Packaging
28x3.00* 32x3.00*
42 42
* On demand
- Oxygen barrier pipes have higher mechanical strengths than ordinary Pex pipes, as the two additional layers that are 0,15mm thick add extra material. For example, ordinary Pex pipes should have a minimum outer diameter of 16mm and minimum wall thickness of 2.00mm to meet DIN 16892. The oxygen barrier pipe should have a minimum outer diameter of 16.3mm and minimum wall thickness of 2.15mm to meet DIN 16892 (mechanical strength) and DIN 4726 (which defines oxygen diffusion). - Present lower linear heat reversion. Laboratory tests have shown that Como-pex pipe specimens at 120°C present 0,8 % heat reversion (with a limit according to DIN being at 3%). Como-pex Oxygen barrier pipes present 0.5% heat reversion. For all the aforementioned reasons, Pex pipes with oxygen barrier are used in all applications all over the countries of Northern Europe.
Como-pex Oxygen Barrier
Particularly for central heating and underfloor heating installa- tions (closed circuits), Interplast manufactures Cross Linked Polyethylene pipe with an oxygen barrier.
The Como-pex Oxygen Barrier pipe consists of 3 layers:
-Inner layer of Cross Linked Polyethylene -Bonding layer for better adhesion of EVOH to the main pipe -Oxygen Barrier layer (EVOH-ethylene vinyl alcohol polymer)
The additional properties, as compared to ordinary Pex pipe, are analyzed below:
- The special oxygen barrier prevents oxygen and other gases from entering the closed heating circuit through the pipe and corroding the metal components of the system (e.g. radiators, boiler, valves etc). In the case of underfloor heating, where the circuits are quite long, it is considered as a must.
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