Civil Works. Industrial Production



1. A wrapping of one or more strands of fibers wound along the length of the bar causing an internal corrugation

2. Projections, in the manner of cords transverse to the longitudinal axis of the bar

3. Sprinkling of the uncured surface by silica / quartz granulation


  • Good adhesion. Surface finish according to the good concrete-round adhesion.
  • High resistance. The fiberglass fabric causes the impact load to be distributed over the entire material.
  • Resistant to corrosion. It does not rust and is resistant to the action of seawater, chemicals, and the alkalinity inherent in concrete.
  • Electromagnetic neutrality. Total permeability to all types of radiation such as electric, magnetic or radio frequency
  • Low weight and maintenance. It weighs up to a quarter of the weight of a steel bar of equivalent size. Lower load on the final structure.
  • Economical transportation and assembly. For the transport of the same number of bars, up to 4 times more trucks are needed to transport steel bars




  • Ease of transport and isolation. Less density - 20% steel
  • Without magnetic interference. No magnetic interference with electric fields.
  • Flexible design. Freedom to create almost any form and imitate anyone.
  • Corrosion resistance and extremely durable. Resistance to corrosion and chemical agents, internal treatment is not necessary nor coating.
  • Excellent structural properties. The best strength-to-weight ratio.



The following layers are distinguished in a GRP duct:

Exterior surface: The purpose of this layer is to provide resistance to external, environmental or terrestrial agents and give the tube a certain color or finish.

Layers 2 and 4 are used for the mechanical strength of the duct.

Core: The core is used to strengthen the laminate and increase the rigidity of the pipeline.

Barrier layer: Used as a transition between the resins used in the inner layer and the first inner layer of coating.

Inner structural layer: This layer provides chemical resistance, abrasion resistance of the fluid, total water tightness and, finally, low roughness to reduce load losses.

Raw Materials:

Most used resins:

  • Isophthalic polyester resin
  • Bisphenol polyester resin
  • Vinyl ester polyester resin
  • Terephthalic polyester resin
  • Epoxy resin

Glass fibers with good chemical corrosion and very high mechanical resistance.

Carbon fibers with high tenacity resistance and high elastic modulus.
Auxiliary raw materials consist of accelerators, catalysts and inert material.

The final configuration of the tube will be defined with different selections of these 6 layers.



  • Does not require cathodic protection.
  • Light weight. Transportation is easier than traditional materials and assembly is simplified
  • Inocuous. The use of FRP pipes for potable water is authorized by all public authorities and other health agencies.
  • Less loss of load. It is possible to transport a greater flow with the same energy.
  • Flexibility. Adaptation to the soil, absorbs small differential settlements. The deformation of a flexible tube is controlled by the settlement of the floor. After settlements, traffic or ground loads do not affect the deformation of the pipe.
  • Resistance to corrosion and chemical agents. The internal treatment is not necessary nor the coating.



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