How Much do You Know about a PAP Multilayer Plumbing System?

Jul. 05, 2022


A complete PAP Multilayer Plumbing System usually includes multilayer pipes, brass fittings and valves. With excellent hygienic and corrosion-proof performance, it is widely used in the reliable and healthy water supply

So how much do you know about a PAP Multilayer Plumbing System? How to choose appropriate PAP pipes and fittings for your project? You can get all the answers about PAP Multilayer Plumbing System in this article!

What is Multilayer Pipe?

Multilayer pipe is also called PAP pipe. It is a pipe with a five-layer structure. Its inner and outer layers are made of polyethylene and its middle layer is made of welded aluminum pipe. The other two layers between the aluminum layer and the polyethylene layers are powerful adhesive layers used to bond them together tightly.


Multilayer Pipe Size

What are the common specifications of PAP multilayer pipes? It depends on your actual needs. RIFENG provides an extensive range of specifications for the multilayer pipes, covering 12mm, 14mm, 16mm, 18mm, 20mm, 25mm, 32mm, 40mm, 50mm, 63mm, and 75mm. The pipes are usually packed in coils as long as 50m, 100m, 200m, etc.

Multilayer Pipe Type

To meet various demands in different water supply applications, three types of multilayer pipes in the RIFENG product portfolio are available for you. They are HDPE-AL-HDPE pipe, PERT-AL-PERT pipe, and PEX-AL-PEX pipe.


This pipe is composed of inner and outer layers of high-density polyethylene (HDPE), two adhesive layers, and a lap-welded aluminum layer. Its operating pressure can reach up to 1.25Mpa and long-term operating temperature up to 40℃. With these good properties, it is an ideal option for cold water supply.


RIFENG PERT-AL-PERT Pipe with a lap-welded aluminum layer features better flexible and hygienic performance. It can withstand maximum operating temperature up to 95℃ in an instant. Therefore, it is usually for use in hot and cold water supply.


With crosslinked polyethylene as raw materials, RIFENG PEX-AL-PEX Pipe is tougher and has better pressure resistance performance even at high temperatures. Also, its better resistance to corrosion and chlorine oxidation makes it more durable and has a longer service lifespan.


What Should You Choose Multilayer Pipe for Plumbing?

Advantages of PAP Multilayer Pipe

  • Integrating the advantages of metal pipes and plastic pipes, PAP multilayer pipes have excellent corrosion resistance, high temperature resistance, and aging resistance.
  • With an inner layer of PEX/PERT and an aluminum layer in the middle, PAP multilayer pipes can isolate oxygen and light, inhibiting bacteria growth.
  • They feature a low coefficient of thermal expansion. That means they are not easy to deform the wall or the ground after being buried.
  • PAP multilayer pipes are lightweight and flexible enough to be bent and can stay in place after bending and forming. Hence, fewer fittings are needed in installation, lowering the pressure loss and risk of leakage.  

What Pipes are Better for Plumbing?


PAPMultilayer VS Copper VS PEX

The cost of PAP multilayer pipes is higher than PEX pipes but lower than copper pipes. And PAP pipes have outstanding corrosion resistance, so they usually serve more than 50 years under normal conditions. As for ways of connecting, you can use tools like spanners, jaws, torque wrenches to connect with no need for welding.

The cost of copper pipes is relatively high and is easily affected by the marketing environment. In addition, comparing the other two materials, copper pipes are more likely to corrode. Thus, their service life largely depends on the operating environment. As for ways of connecting, they are generally welded for connecting.

The cost of PE-X pipes is relatively lower than the other two materials. They’re highly flexible but easy to rebound after bending. With their outstanding corrosion resistance, they are expected to serve over 50 years. As for ways of connecting, you can also use tools for connecting like that of PAP pipes.

Who is the Largest PAP Multilayer Plumbing Pipe Supplier?

PAP multilayer pipe is one of the flagship products for RIFENG. With advancing manufacturing processes and highly automatic facilities, the production capacity of pipes can reach up to 3.2 billion meters annually. Undoubtedly, RIFENG is one of the largest PAP multilayer pipe suppliers globally. Besides pipes, fittings and related installation tools are also available in RIEFNG, because we strive to make your plumbing systems with a highly systematic match, lowering the risk of leakage to the maximum extent.

PAP Multilayer Plumbing System