The right resin for any requirement
We come to the first important decision for the optimum GRP system with the selection of the suitable resin and hardener. Our criteria are the medium – what resistance is needed? –, the working temperature and local operating parameters. You can find precise details concerning the resistance of the various resin types from our chemical resistance list.
Here is a summary of the resin types which we use the most:
Isophthalic acid – low chemical resistance
GRP pipes and containers made from isophthalic resin are ideal for cooling water and similar applications. They are particularly economic if there are low demands for chemical resistance. The temperature resistance is up to 80º C.
The principle: The integration of resin and hardener occurs in a monomer solution – as long as monomers are available. The changeover into the spatially cross-linked form is chemically initiated by catalysts (e.g. peroxide).
Vinyl ester resins – chemical resistant standard
Bisphenol-A vinyl ester resins such as Derakane 411 are the standard resins in the area of pipeline construction and container manufacturing. Here we combine high resistance to many media (acids, brines, bleaching agents and solvents) with good processability. We at Fiberpipe use vinyl ester resin pipes in temperatures of up to 95º C. If gases are to be conveyed, higher temperatures are also possible (please see our chemical resistance list).
The principle: Vinyl esters which are dissolved in styrene harden through copolymerisation with the solvent in a cross-linked way. These further linking results in oscillation resistant, hard and tough products.
Novolaks – high temperatures and chemical resistance
Novolak vinyl ester resins such as Derakane 470 are designed for maximum thermal and chemical resistance. They are particularly well-suited for use in contact with solvents, acids and oxidising substances – such as chlorine gas.
Through their good toughness at high temperatures of up to 170º C they have also proven excellently in exhaust gas applications.
The principle: Novolak vinyl ester, dissolved in styrene, also harden through copolymerisation with the solvent in a cross-linked way.
Epoxy resins – maximum resistance and resistance to high temperatures
Preparing our combination is very demanding, resin and hardener, for example, must be preheated at a particular temperature. We process bisphenol-A epichlorohydrin epoxy resin with so-called aromatic amine hardening.
It is precisely with this combination that we achieve the best resistance against a great number of acids, brines, solvents or oils and oil products. Through the high degree of cross-linking and the very dense molecule lattice, our epoxy resin pipes and containers can also be used at significantly higher temperatures including for liquid media.
Up to 130º C is possible (you can also find out more about this on the chemical resistance list.)
The principle: The reactants are embedded in the molecule lattice through a poly-addition reaction. Unlike in the case of polyester or vinyl ester resins, here we ensure that the stoichiometric equivalent is precisely maintained. In this way, we achieve the highest quality and resistance.