Alternative to traditional materials

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Quick overview

GDP KORAL s.r.o.

It´s a partnership of French company GDP SA, which are engaged in pultruded profiles and load-carrying constructions, and Czech company KORAL s. r. o., supplier of full range of materials and things for lamination. We are section of company GDP Group, which proposes, produces and supplies solutions on the basis of plastics composites by production plants in France, Spain and Czech Republic.


Technology of manufacturing

Plastics composites are produced by many various technologies. Company GDP KORAL is specialized in highvolume continual technologies, mainly pultrusion and pressing.


What are composite materials?

Composites are defined as materials, which are consisted of two or more components variant physical and chemical properties.


ISO 9001, ISO 14001

What are composite materials?

Composites are defined as materials, which are consisted of two or more compovents variant physical and chemical properties. The wholly new material with unique properties develops from connection of fibres and resin. These properties can not be obtained by any component alone neither simple simulation. Significant types of composites are plastics reinforced by different kinds of fibres. They can be distributed into two groups according the length of fibres. Syntetic materials reinforced by short fibres so-called shortfibrous (the rate of length/average L/D<100) and syntetic materials reinforced by long fibres so-called longfibrous (L/D>100 i.e. fibres with length equal dimensions of whole section).composite profile

The shortfibrous composites are used for gouted moulding and plastics extrudates. The longfibrous composites are used for a big constructutions as ships, pressure tanks, wings of wind turbines. The principle of self fibrous reinforcement is following. The fibrous reinforcement has about one till two ranks higher strength and stiffness than matrix. These fibres are deformed less than polymeric resin. In so far that on the on the interface between fibre/polymer generate shear forces, which faciliate transfer of entire strain from infirm matrix to fibres in case of adhesion between both components. Fibres are able to support entire strain applied on composite section, so that infirm but deformablematrix is in practice without strain.

The weight is markedly decreased by using of composites against traditional materials such as steel. It results from low weight of composite, specific properties of individual components and possibility to make composite for given purpose. Because it is concerned a material combination, composites can be proposed with regard to specific properties, which carry range of advantages in comparison to traditional materials, e.g. chemical resistance, electrical and thermal insulation and so on.

Raw materials


Unsaturated polyester are the most used matrix for reinforced plastics composites, especially in combination with glass fibres. Polyester resins have good mechanical, electrical and chemical properties.


Modified methyl-methacrylate resins have famous properties and are the most used in combination with highly quality fibres such as carbon. It is possible to load these resins with flame retardants, therefore they are excellent solution for applications, in which the fire resistance is demanded.


Epoxides have excellent mechanical and electrical propeties. These resins are usually used with carbon or glass fibres, if the amount of reinforcement is very high. They have good electical insulative properties in wide range of temperatures and considerable chemical resistance.


Vinylesters combine the best properties of polyester and epoxides resins. They are acid and alkaliproof, especially at high temperatures. Glass-fibre reinforced vinylester profiles are good electrical and thermal insulants.