The aim of the proposal was to modify several epoxy resin systems designed for the manufacture of fibre reinforced composites. These modifications included the use of silica nanoparticles, tougheners like core shell elastomers and combinations thereof. The modified resin systems are adapted to the processing conditions in the manufacture of the FRCs. The modifications are selected to increse significantly the performance of the FRCs by means of toughness, stiffness, fatigue etc.