Trio Coating

“Trio” coatings are extruded three-layered coatings that include the following 3 layers - epoxy, adhesive, and polyethylene or polypropylene - and are applied on 3” - 100” diameter pipes with a wall thickness of 1.5 mm to 4.0 mm. (for thicknesses over 4 mm it is possible to place a special order).


Key features of the coating are as follows:

Electrical insulation of steel pipes

Insulated steel pipe for protection against the ingress of water and oxygen

Adhesion strength and continuity between the coating and pipe

Long term stability

Resistance to penetration of stones or other sharp objects

Resistance to impact by falling of stones and rocks


Trio coatings include either polyethylene or polypropylene:

Polyethylene (PE) coating is suitable for conveyance of hot liquids and gases, up to a service temperature of 70° C.

Polypropylene (PP) coating is suitable for conveyance of hot liquids and gases, up to a service temperature of 110° C.

Epoxy layers may be applied in large thicknesses of up to 400um (F.B.E coatings) in accordance with US standard requirements.

"Trio 4" – This new 4 mm coating is now available for all company pipe diameters which are currently supplied with customary Trio coating. As such, the product comes to replace the company's existing “Trio Pipe with Compressed Concrete” product which was not ideally suited for field work due to difficulties in unloading and placement inside the ditch.

Product Description: Steel pipe with internal concrete lining and 4 mm thick polyethylene Trio coating. The most common thickness used today is 5.5 mm (the external coat is made of High Density polyethylene (H.D.P.E.) which offers improved mechanical properties.


  • The 4 mm thick coating provides extremely high protection against external factors that affect pipe quality (mechanical factors external corrosion).
  • Lower costs in repair of compressed concrete that is damaged during unloading due to reduced pipe weight.
  • Improved quality of internal lining due to reduction in pipe weight and in loads exerted on it during unloading from truck.
  • Improved pipe flexibility during unloading and placement in ditches. This allows continuous work without the pipes without damaging the external coating or internal lining.
  • No changes required in existing work methods or in covering of ditches after laying down of the pipe.
  • When connecting pipes, there is no need to apply concrete completions after welding as the external wrap is completed using “Knosa” geotextile sheets"Canusa" shrinkable sleeve .
  • Shorter time required for laying down of pipes due to decreased pipe weight.
  • When laying 3” and 4” diameter pipes, there is no need for use of cranes in laying down of pipes due to decreased pipe weight in comparison with pipes having customary Trio and compressed concrete coating.
  • Cost savings in transportation of "Trio 4" coated pipes due to decreased weight in comparison with compressed concrete coated pipes and increase in number of pipes transported to the site in a single delivery.

Please set the following variables:

Outside Dia
inch Mm
Allowable Working Pressure
GR-B X42
Wall thickness
inch Mm


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