Marquage tuyau fonte NATURAL Saint-Gobain PAM

The NATURAL range

The reference pipe for water distribution

Resulting from our ongoing research into zinc-based coatings to improve the protection of buried networks of iron pipes, this PAM range has become embedded all over Europe and is at the heart of the hydraulic networks heritage. The NATURAL range benefits from BioZinalium® external protection technology, which ensures very long durability in underground conditionsThe internal lining is composed of centrifuged cement mortar, which offers excellent hydraulic conditions as well as an effective protection against the aggressiveness of water. NATURAL fittings are also delivered with a blue epoxy coating, applied by cataphoresis or by powder coating.

Composed of pipes with standard joints, associated with RAPID or UNIVERSAL joint fittings, the NATURAL range comes highly recommended by pipe-laying contractors as it makes installation extremely easy. The small/medium diameter pipe system dedicated to potable water applications is available between 80 and 1000 mm. They are suitable for both transport and distribution of water in urban, semi-urban and rural areas. 


NATURAL pipes - Saint-Gobain PAM



  • Innovation: the NATURAL range combines past experience with advanced technologies to ensure the robustness of ductile iron pipes, their ease of laying and speed of installation, reliable operation and long-term durability.

  • External protection: identifiable by its blue colour, the NATURAL pipe benefits from BioZinalium external protection technology to ensure extreme durability in underground conditions. BioZinalium is composed of two layers: a layer of zinc-aluminium 85/15 alloy, enriched with copper, with a minimum surface density of 400g/m², applied by spraying molten metal onto the surface of the iron, using an electric arc spray gun, from ZnAl (Cu) alloy wire, and a protective layer of Aquacoat (semi-permeable), a water-based blue acrylic of average thickness 80 microns applied using a spray gun.

  • Extra protection: while protecting against localised bio-corrosion, for extreme conditions, the NATURAL range comes equipped with special coatings for additional corrosion protection:

    • NATURAL PUR: internal protection for the transport of aggressive waters (hardness <5°F); and
    NATURAL TT PE: external protection for pipe laying in aggressive terrains.

  • Internal performance: the internal lining of the NATURAL range is composed of centrifuged cement mortar, which offers excellent hydraulic performance as well as effective protection against the aggressiveness of water due to the smooth internal surface improving the water flow and reducing head losses.

  • Flexibility: the UNIVERSAL automatic joint and RAPID mechanical joints guarantee watertightness and can tolerate a high degree of angular deflection to negotiate large radius curves without the need for fittings and adapt to layout changes. They can also absorb ground movement or expansions of small amplitude. Self-anchored pipe and fitting joints can be used to produce self-retrained ductile iron pipelines while the UNIVERSAL range is available for extreme network operating pressures.

  • Safety: with a safety coefficient greater than three and PFA values always exceeding 40 bar in sizes DN 60 to 300 and more than 30 bar in sizes DN 350 to 600, the pipes and fittings are highly resistant to internal pressure. The mechanical strength of the ductile iron pipes also minimizes the trench bottom, backfill and surrounding work so that pipe laying operations are ultimately safe and economical.   

  • Eco-friendliness: in line with our commitment to sustainable development and in compliance with UK and International standards, the BioZinalium finishing coat is produced using an emulsion of water-based acrylic PVDC resin that does not contain organic solvents or Bisphenol A (BPA). In fact, it contributes to reducing emissions of volatile organic compounds into the atmosphere.

Natural Pipe

Technical Details

  • Diameter range: DN80– DN800 (DN900–DN1200 on consultation
  • Push-fit joint:
    • Non restrained (Rapid)
    • Self-restrained (Rapid Vi)
More information on all jointing systems available


  • Pipes (2 options):
    • DN80-DN300: BioZinalium, Zn-AL (Cu) alloy 400g/m2 + water-based paint (Aquacoat)
    • DN350-1200: Zn-AL alloy 400g/m2 (Zinalium) + blue epoxy
  • Fittings: Blue epoxy 250μm
More information on Special Coatings here


  • Pipes (2 options):
    • System CL: Blast furnace cement
    • System XL (DN80-DN700 only): Cement mortar + epoxy seal coat (for soft water areas only)
  • Fittings: Blue Epoxy 250μm

Key Features & Benefits

  • Ductile iron material
  • Mechanically robust
  • Highly resistant to damage
  • High safety margin to operate at up-rated pressures
  • Long term reliability
  • Coating suitable for more than 90% of UK soils
  • Eco friendly: recycled and infinitely recyclable
  • Self-anchoring gasket available for restrained pipes application
  • Up to 5 degrees angular deflection

Standards & Approvals

bsi kitemarkwras logodwi logo





Technical Enquiries:
+44 (0)115 930 0700
Customer Services:
+44 (0)115 930 5000


Videos and pictures
natural pipe installation video thumbnail
natural pipe push on fitting

Potable Water

Saint-Gobain PAM supplies ductile iron pipelines throughout the world, allowing water to be transported from its source to treatment plants and places of consumption. PAM solutions cover the entire water transport cycle :

  • Gravity Supply

  • Potable Water Distribution

  • Water Treatment

Saint-Gobain PAM is involved in both the preservation of the 'water' resource and its transport in all situations. Only 3% of the Earth's water is fresh water and over two thirds of this is frozen in glaciers and polar ice caps. The remaining water is therefore a very precious resource. We have the utmost respect for this rare commodity and pride ourselves in providing comprehensive pipe solutions for the supply, treatment and distribution of drinking (potable) and raw water (untreated) as well as waste and recycled water.

Developed from PAM proprietary research, the wide variety of our ductile iron pipelines ranges include external coatings, joints and internal linings that highly adaptable to various geographical configurations and different types of work site environments. For example, our solutions have been carefully customised to handle aggressive soils, soft waters, and irrigation requirements. 

Our Product Ranges include:

    • The reference ductile iron pipe for water distribution networks, the NATURAL range combines past experience with advanced technologies to ensure the robustness of ductile iron pipes, their ease of laying and speed of installation, reliable operation and long-term durability
    • Scientifically innovative, the award-winning BLUTOP range is ideal for use within drinking water distribution networks in urban, semi-urban and rural areas 
    • Suited for conveying large volumes of water, the robust, ductile iron pipes of the CLASSIC range are built to last in the most adverse conditions.

See below for further product details and technical specifications:

See more

See also

PAM solutions cover the entire water transport cycle.