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


GDP KORAL has developed stairs with the following type of string:

SchodištěThis stair is suitable for industrial plants, sewerage pants and so on. A typical stairs consists of two strings made of U-profiles and steps consisting of pultruded gratings or planks. The railing of the stairs will typically be constructed as a standard GDP KORAL railing, secured on the side of the strings by bolts. The strings are cut off at the ends to fit against the underlying layer at the floor at the top. The steps are secured to the strings using angle profiles which are mounted on the inner side of the strings with M8 plank bolts.

The steps are also secured to the angle profiles with M8 plank bolts. A stairs is normally secured to the underlying layer by bolts. As the steps are the only connection between the strings, it can be necessary to mount another form of connection in some cases, for example: threaded rods to connect the strings. The railing consists of stanchions of square tube which are secured on the side of the strings. The distance between stanchions are adjusted so stanchions are positioned at the ends of steps.

Stanchions are mounted with two M8 plank bolts which also secure the angle profile that provides support under the step. The handrail fits down onto the stanchions and is secured by four pop rivets. A round pipe is used for the kneerail . It passes through a Ć 41 mm hole that is bored through the stanchions parallel to the strings. The kneerail is secured in each stanchion by two pop rivets. The footrail can be mounted approximately 10 mm above the string by two pop rivets in each stanchion.