Cross-linked Polyethylene (PEX)

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Regardless of brand, PEX pipes are manufactured via 3 methods (A, B or C) but contrary to popular belief, these letters are not grades of PEX and have nothing to do with the quality or performance of the pipe. The letters are used merely to identify the manufacturing process and in fact, all types of PEX pipe must adhere to the same standard in terms of:

  • Pressure and temperature ratings
  • Minimum bending radius
  • Pipe wall thickness an inner diameter/outer diameter dimensions (subject to manufacturing tolerances).

In brief, there are 3 main manufacturing processes used to product PEX pipe:

  • A (Peroxide or “Engel” method): HDPE polymer is melted, creating free radicals and the cross-linking of molecules occur at temperatures that exceed the polymer’s decomposition temperature.
  • B (Silane or Moisture Cure method): Cross-linking of the HDPE polymer molecules is done after the extrusion process using a catalyst and by exposing the PEX tubing to water (steam bath). This is probably the most common manufacturing process, and Pexline PEX pipe is made using this process.
  • C (Irradiation or Cold Cross-linking method): After extrusion, the pipe is exposed to an electron radiation beam. The radiation allows the breaking of existing bonds between the polymer’s molecules and initiates the cross-linking process.

Pexline pipe is PEX-b pipe and made using the Silane or Moisture Cure method. PEX-b pipe has the highest bursting pressure compared to PEX-a and a similar or better resistance to oxidation – a very important factor for plumbing installations. Furthermore, PEX-b pipe has been in use for over 40 years with no known issues – offering peace of mind.

The Pexline Plumbing System

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The Pexline Plumbing System complies with the Australian and New Zealand joint standards AS/NZS 2492, AS/NZS 2537 and Watermark.
The Pexline system is quality controlled and tested in-house, and covered by extensive worldwide patents.
There is a 25 year guarantee when installed by a licensed plumber in accordance with the Pexline Technical & Installation Manual as well as local and national plumbing regulations.

 

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