Greentherm Multilayer Pipe

Multi-layer pipes are an advanced solution in plumbing and heating systems, offering a combination of the best features from plastic and metallic pipes. Composed of two layers of cross-linked polyethylene (PEX), two layers of adhesive, and an intermediate layer of aluminum, these pipes are a significant evolution from traditional PEX pipes.

The incorporation of an aluminum layer provides multi-layer pipes with unique advantages. On one hand, they possess the flexibility, lightness, corrosion resistance, ease of handling, and long lifespan typically associated with plastic pipes. On the other hand, they also offer the high-temperature and pressure resistance, oxygen diffusion tightness, and shape retention of metallic pipes.

A: PEX layers | B: Adhesive layers | C: Intermediate aluminium layer


Blansol, a trusted manufacturer, offers two types of multi-layer pipes: PEX-Al-PEX and PERT-Al-PERT. The internal and external layers of these pipes are made of cross-linked polyethylene (PEX). Compared to non-cross-linked multi-layer pipes, the PEX-Al-PEX pipes provide superior safety in unions, even under high temperatures. They eliminate the risk of leaks by withstanding demanding working conditions of up to 95ºC and 10 bars pressure.

Blansol’s PEX-Al-PEX pipes, when used in conjunction with their press-fitting system (Multipex), ensure optimal performance and maximum safety in installations. Whether it’s for residential or commercial applications, these multi-layer pipes offer reliability, durability, and peace of mind for various plumbing and heating needs.

Blansol offer the nude pipes in two different formats: coils (used normally in new installations) and bars (used mainly in the renovations).

In the insulated pipes an insulating layer of polyethylene foam is added to the multilayer pipe.

The advantages of the insulated multilayer pipes are the following:

  • Thermal insulation of the pipe
  • Important reduction of the noises and vibrations in the installations
  • Resistance to materials used in the construction (lime, plaster, concrete…)

In the corrugated pipes the nude pipe is inserted in a red or blue polypropylene duct.

The corrugated duct provides an external protection to the multilayer pipe and lets its quick substitution in case of need with no need to break the wall.

  • Linear dilatation 0,025 mm/m·K
  • Thermal conductivity R=0,4 W/m·K
  • Max. work temperature 95° C
  • Max point temperature 110° C
  • Max work pressure 10 bar a 95° C
  • Roughness E=0,0004 mm
  • Density 1,47 gr/cm³
  • Oxygen permeability 0 mg/l*d
  • Crosslinking degree >65%Your 


RBM, manufactures using the best raw materials and the most modern manufacturing and quality control methods. There staff is composed of qualified professionals with the necessary experience so as to guarantee that RBM’s client always has first class products.

RBM’s Multi-layer pipes consist of both insulated and non insulated versions allowing for them to be using in any most applications. With an expected life span of 50+ years when kept with in there specifications.

PE-RT RBM Tita-fix multilayer pipe.
Multilayer pipe for underfloor heating in polyethylene, aluminium and polyethylene.

Welded aluminium layer type A
Composition: PE-RT/Al/PE-RT White

  • Poper: 10 Bar
  • Tmal: 95 °C
  • Duration at operating conditions ~ 50 years
  • Type: PE-RT
  • Sizing: ranges from 16×2 to 40×3.5 (mm)
  • Aluminium th. ranging: .2-.5(mm)

PE-RT RBM Tita-fix multilayer pipe externally insulated with closed cell expanded polyethylene conduit, CFC-free, flame retardant.
Pipe features as in code 1545-1546.

  • Insulating conduit features:
  • Density 35 kg/m³
  • Thermal conductivity at 40 °C
    only conduit: 0.038W/mK
  • conduit + pipe (average value): 0.069 W/mK
  • Steam permeability μ 5.482
  • Insulation thickness 6 mm
    Type: PE-RT
  • Sizing: Ranges from 16×2 – 32×3 (mm)
  • Aluminium th Range: .2 – .4(mm)