Glass fibre reinforced composite profiles are used in an increasing number of structural components thanks to their attractive strength-to-weight ratio and good resistance to chemical attack. Such profiles are produced via the pultrusion technique. As pultruded composites find applications in various chemical environments, a good understanding of their corrosion behaviour is necessary. In this work, the chemical resistance of six kinds of pultruded E-glass fibre reinforced isophtalic polyesters were studied. They contain 50 w% or 60 w% glass. The composites were either unfilled or filled with calcium carbonate or kaolin clay. The mechanical, physical, optical and structural properties of the pultruded flat profiles before and after immersion in sea water, demineralised water, sodium hydroxide (5%) and sulphuric acid (10%) over the period of one year were analysed.
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