Pipes and fittings made of GRP – affordable total investment

Fiberpipe pipe systems consist of various optimally complementary raw materials. These raw materials are different types of glass and reaction resins.

In the case of the interconnection of these raw materials, there is a ‘division of labour’. The quantity and type of glass gives rise to mechanical properties such as tensile strength, compressive strength and electric module. The choice of resin results in the chemical resistance and temperature behaviour of the composite. Since it is not so easy for any other material to shorten the pipes or to install an additional nozzle, Fiberpipe pipe systems also set new standards in the area of assembly costs. The simple and cost-effective installation of Fiberpipe pipe systems ensures that not only the pipe price but also the total investment will arouse your interest.

Production processes

Another important parameter is the manufacturing process. Basically, there are two different ways to make pipes made of glass and resin.

Slinging process

The centling ear is the optimum in terms of chemical resistance and abrasion resistance.

Sling tubes are produced by making cuts corresponding to the circumference and length of the mould from different types of glass fabric and glass mat. These cuts are inserted into a mold, this form is brought in rotation (SCHLEUDERN). Resin is then injected from the inside.

This method offers the following advantages:

  • maximum temperature resistance, as optimal infusion of glass fibers with resin.
  • highest chemical resistance, as only resistant resin in the internal chemical protection layer.
  • lowest flow losses, as “perfectly” smooth inner and outer wall.

Winding process

Since a production of centling tubes is no longer economically interesting above a nominal width of DN 350, the so-called winding has been perfected as a further production method. Winding tubes are made by leading endlessly long threads (roving) over a wide comb to a mold. There, either the mold or the threads are wetted with resin and applied to the mold (wrapping). This technique can be refined by varying the winding angle and adapting it to the requirements (e.g. at internal pressure winding angle 54° to the pipe axis). This production method also strives to achieve the highest possible amount of resin inside the pipe. For this purpose, at the beginning of production of the pipe, a fleece or a mat is introduced as a carrier for the resin.

  • lowest wall thicknesses, as optimal alignment of the fibers to stress.
  • high chemical resistance, as the thickness of the internal chemical protection layer is variable.
  • economical alternative to other materials such as steel rubberized.

Wall construction of Fiberpipe winding tubes made of epoxy or vinyl ester resin.

The right resin for every requirement


By selecting the right resin and hardener, we make the first important decision for the optimal GRP system. Our criteria are the medium – what consistency is required? operating temperature and local operating parameters. The exact information on the resistances of the different resin systems can be found on our resistance list.

This is an overview of the resin groups we use most often:

Isophthalic acid – low chemical resistance

For cooling water and similar applications, GRP pipes and containers made of isophthalic acid resins are ideal. They are particularly economical when there are low demands on chemical resistance. The temperature resistance is up to 80 degrees Celsius.

The principle: The crosslinking of resin and hardener takes place in a solution of monomers – as long as monomers are present. The transition to the spatially crosslinked form is chemically initiated by catalysts (e.g. peroxides).

Vinyl ester resins – chemical-resistant standard

Bisphenol-A-vinyl ester resins such as Derakane 411 are the standard resins in the field of pipeline construction and container production. We combine high resistance to many media (acids, alkalis, bleach and solvents) with good processability.

At Fiberpipe, we use vinyl ester resin tubes up to a temperature of 95 degrees Celsius. If gases are to be passed through, higher temperatures are also possible (see also our resistance list).

The principle: Vinyl esters dissolved in styrene cure by copolymerization with the solvent cross-linked. This terminal networking leads to vibration-resistant, tough products.

Novolake – high temperatures and chemical resistance

Novolak vinyl ester resins, such as Derakane 470, are designed for maximum thermal and chemical resistance. They are particularly suitable for use in contact with solvents, acids and oxidizing substances such as chlorine gas.

Due to their good toughness at high temperatures up to 170 degrees Celsius, they have also proven themselves excellently in flue gas applications.

The principle: Novolak vinyl esters, dissolved in styrene, also harden by copolymerization with the solvent crosslinked.

Epoxy resins – maximum resistant and high temperature resistant

The processing of our combination is highly demanding, so resin and hardener softeners, for example, must be preheated to a certain temperature. We process bisphenol-A-epichlorohydrin-epoxy resin with so-called aromatic amine curing.

With this combination, we achieve the best resistance to a variety of acids, alkalis, solvents or oils and oil products. Due to the high degree of crosslinking and the very dense molecular grid, our epoxy resin tubes and containers can also be used for liquid media at significantly higher temperatures.

Up to 130 degrees Celsius are possible (further details can also be found on the resistance list.)

The principle: The reaction agents are incorporated into the molecular grid by a polyaddition reaction. Unlike polyester or vinyl ester resins, we take care to strictly adhere to the stoichiometric equivalent. This is how we achieve the highest quality and consistency.

Connection types

What is the use of the best pipes and fittings if you cannot be connected or only very elaborately connected?

Basically, almost all common connection types are possible when processing fiberpipe pipes. The most common are CONNECTION, LAMINATING, STICK-IN and manufacture of flange joints!

Adhesive connection

Adhesive technology is the most widely used method of making a pipeline out of pipes and fittings. For this purpose, the pipes are cut off, the adhesive surfaces are roughened, the glue is applied, the end of the pipe is pushed into the sleeve, fixed and then tempered.

This fast and cost-effective type of assembly has proven itself around the world over the last 20 years and is now beyond question.


The laminate compound is the classic way to connect GRP parts together. The workflow is familiar to anyone who has ever repaired their car, boat, surfboard or similar with GRP. Here, too, the surface is sanded and then glass mats and fabrics soaked with resin are applied according to specifications. After reaching the desired wall thickness, the laminate is dried, tempered and can immediately strain the connection.


The plug-in connection is particularly suitable for longer distances. In this type of connection, a groove for the locking rod and one to two O rings are provided in the socket area of the pipes. The workflow is as follows: The pipes are pushed together and then the heated locking rod is driven through the corresponding groove. Also in this type of laying, the fittings are connected to the pipe by gluing.


All common flange connections can also be represented with fiberpipe pipe systems.

Whether fixed flange, DIN, ISO, waistband and loose flange made of GRP, galvanized steel, PP coated or special flanges…..everything is possible.


Fiberpipe or Fibercast piping systems are characterized by a large variability in the type of connection.

Whether Straub, Mewa, Gruvlock or whatever, put us to the test.

Tel: +49 (0)2402 - 865988

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