Technical specialties

Managing Life


One of the main global targets to solve along this century will be to ensure the availability and quality of water. Accordingly, the harmonization of water supply infrastructures with the environment, besides the adequate security measures, will be increasingly demanded by the society.

Water is also one of the main aggressive element s to take in account in the construction of infrastructures. Water can affect concrete and steel, directly or through the transport of active ions, leading to a gradual degradation and reducing the service life of the water infrastructure.

However, all infrastructures involved in the water management cycle (dams, canals, treatment plants, pipes, tanks…) should have a long life span..

This perspective is affected by the environmental and preservation conditions. Therefore, it’s important to standardize action guidelines to extend service life of the infrastructure and to avoid water leakages.



Water is a basic and necessary good but also limited in many regions around the globe. Hence, infrastructures built to enable the drinking water cycle have become in recent years a key element for every country. Our commi tment to preserve those infrastructures as long as possible is full, always complying with maximum quality, hygiene and health standards..

Therefore, GAIRESA started almost 30 years ago to develop an epoxy coating for tanks containing drinking water (and other alimentary liquids). This coating should be non-permeable and chemically resistant to the liquid inside the tank, but also safe in terms of toxicity. It’s necessary to place oneself in the context of that period to realize that requirements and regulation for plastic materials were less strict than nowadays.

To develop the above mentioned coating GAIRESA worked in close cooperation with the Bromatology Department in University of Santiago.

GAIRESA formulated the coating and the University made the tests according to the European directives below:

  • 82/711/CEE

  • 85/572/CEE

The formulation was modified to comply with the migration limits permitted by those regulations until the right formulation was developed (third attempt) with successful results. The proper repor t was issued on September 1st 1991, starting then the commercial introduction of the resulting coating (BEPOX 889), which has grown drastically until today because of its excellent behavior.
As a consequence of these investigations GAIRESA published a number of scientific articles in top international journals and part of our analytical methodology, as well as the discovering of the hydrolyzed molecules of the resin, were adopted by the European Commission in the subsequent regulations and controls for epoxy coatings in contact with food.
Certainly, BEPOX 889 marks the starting point in Europe for this kind of coatings. Of course, BEPOX 889 is periodically updated according to the current regulations.

Limitations Of Concrete


Obviously, the quality of a construction affects the time to reveal the first structural failures, but also truth is that concrete has inherent chemical resistance limitations. As concrete is the main material for the construction of infrastructures, it becomes increasingly important to use technical complements such as chemically resistant coatings to enhance durability and delay ageing of the structure.

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Technical Procedures



Structural stability and proper operation of infrastructures for water management depend on the weathering resistance related to the action of water and the aggressive agents transported.

Therefore, features of the coating applied should meet the following targets:

  • Functional waterproofing of the structure.
  • Chemical protection of concrete.
  • Durability and ageing resistance.
  • Reduction of preservation and maintenance costs.
  • Reduction of total costs.

To achieve optimal global results it is vital to meet different quality principles:

  • Appropriate materials for the characteristics of the work.
  • Custom made execution procedures.
  • Execution by qualified workers with experience and control of the materials.
  • Self-control and verification system to satisfy right proceeding and expected features.

Most Common Technical Procedures

  • Inyections Of Resin With Different Viscosities

    Inyections Of Resin With Different Viscosities

    To recover structural continuity we developed different injection methods at pressures from 1 to 150 bar. We used epoxy formulations with different viscosities, adherent to dry or wet substrates, different Young’s modulus and low exothermic reaction in large quantities, according to the requirements of each project.

  • Treatment Of Joints Suitable For Drinking Water

    Treatment Of Joints Suitable For Drinking Water

    Thixotropic formulations based on ultimate generation elastomers, with elongation at break over 500%, high impermeability, excellent chemical resistance and constant adhesion to concrete, are a reliable solution for a properly designed expansion joint. In most cases, it is recommendable to complete the system with a flexible laminate over the joint..

  • Teimpox Sistem Structural Regeneration

    Teimpox Sistem Structural Regeneration

    Constructive complement as thixotropic mortar or micromortar with high mechanical properties for the regeneration of degraded concrete structures.

  • TeimLam® Composite

    TeimLam® Composite

    Special Coating For Highly Degraded Structures

    This system comprises on-site made composites based on the synergic combination of special polymeric binders and selected fiber reinforcements. Its main features are backpressure resistance, cracks and fissure bridging, high impermeability and excellent ageing resistance. They are able to retain the initial properties during a reasonable time span.

  • BEPOX 889 Healthcare Coating

    BEPOX 889 Healthcare Coating

    Grupo Teimper started 30 years ago to develop an epoxy coating for tanks containing drinking water. This coating should be non-permeable and chemically resistant to the liquid inside the tank, but also safe in terms of toxicity. This system brings a hygienic finish and “zero migration” since the first day in contact with water. Certainly, BEPOX 889 marks the starting point in Europe for this kind of coatings.



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Water reservoirs are one of the main driving forces of the economy: drinking water supply for the cities, crops irrigation, floods control and electricity production in hydroelectric plants. Construction of dams is a well-known old Spanish tradition. Since Roman times, many infrastructures were built, including important technical milestones like the arch-gravity dam of Almansa, the oldest operative dam in Europe (1584).

Because of this experience, more than a third of operating dams in Spain are over 50 years old. Hence, a strong research and development of products and systems was done to conserve and rehabilitate this important social heritage according to more modern requirements.


  • 1. Internal sealing of cracks and joints using different kind of resins.
  • 2. Waterproofing of upstream face including injection of rubber resin.
  • 3. Preparation of expansion joints between the dam wall and the lower edge of the coating, at the bottom of the upstream face.
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Once water is stored, it must be carried to the consumption places. Since Roman times this is done by canals and aqueducts.

It is very important to keep in good condition these structures with the minimum water leakages. Environmental and ground conditions produce continuous movements, which induce the appearance of fissures and cracks. Our treatment systems, custom made, are adapted to the particular conditions of each structure and its technical requirements.


  • 1. Functional impermeability of the structure.
  • 2. Chemical protection of concrete.
  • 3. Ageing resistance.
  • 4. Reduction of preservation and maintenance costs.
  • 5. Improvement of Manning Coefficient, increasing the hydraulic circuit efficiency.
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A pipe is a conduction whose function is to carry water and other fluids. They can be made of many materials, being steel the most common. CMetal pipes for water (potable or not) are made of several sections welded to each other. The usual manufacture process includes the coating in plant, both external and internal. Likewise, all joints between pipes must be treated.

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Drinking water tanks are a key element in the water supply chain. In densely populated areas is imperative to have one or more tanks to control the water supply, being the connecting link between treatment stations and supply network.

The type and quality of materials in contact with stored potable water inside the tank is very important to avoid disruption or pollution of the supplied water. Sooner or later, all water tanks have problems in the interfaces with water during their service life.

Thus, they must be repaired to avoid pollution or quality decrease of stored water. Other elements in the tanks (roofs, decks, external walls…) suffer also structural and impermeability problems, due to different external agents.

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Treatment Stations

These facilities are essential to avoid the pollution by wastewater, doing a partial removal of the pollutants and allowing the nature to complete the process within the water body acting as receptor (river, ocean...).

Thus, the level of treatment is function of the natural purification capacity of the water body. At the same time, this capacity is function of the volume and the oxygen content within the water body. Therefore, the targets of treatment stations are to give back water to the nature and to get a solid residue or sludge available for disposal or reutilization.

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