Multlilayer PEX System
Multilayer pipe consists of five layers of uniform thickness:
- PEX-B outer tube is bonded to a reinforcing, oxygen-tight aluminum tube
- A perfectly symmetrical aluminum tube is butt-welded by advanced laser
- PEX-C inner tube is bonded to the aluminum layer
Multilayer (Composite) pipes were developed at the beginning of the 80’s. The pipes were made of a composition of PEX and ALUMINIUM. The Multilayer pipe was regarded as an innovative plumbing product, successfully combining the features and benefits of both PEX and metal in one pipe.
The Multilayer Pipe is being increasingly recognized as an attractive alternative to traditional metal pipes like copper, both in term of performance and ease of installation and maintenance.
The European market share of Multilayer pipe is constantly growing! Predicted annual growth is 20% by the year of 2004!
MULTILAYER PIPE combines the advantages of both plastics and metal:
- Lightweight and strong
- Flexible and solid
- Round and symmetric
- Long term resistance
- Simple and easy to work with
- High chemical and corrosion resistance
- Oxygen diffusion barrier
- Considerable higher pressure values
- Thermal expansion - similar to metal pipes
- Smooth inner surface
MULTILAYER PIPE applications:
- Domestic sanitary hot and cold water supply (95°C and 10 bars)
- Solar heating systems
- Underfloor heating and radiators systems
- Gas transportation
There are two popular methods of joining PEX/AL/PEX pipes:
One method uses a press fitting; the other is a screw fitting.
Both kinds of fittings are insert-type fittings.
The press fitting requires a pressing tool, while the screw fitting is tightened with normal wrenches.
Most of the fittings have o-rings as part of them. This is to ensure the most positive sealing for the joints of the piping system. It is recommended to use pipes and fittings which are supplied together as system.