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Nanosilica and CTBN (carboxyl-terminated butadiene-acrylonitrile) rubber particles have been used to form hybrid toughened glass fibre composites without detriment to flexural modulus or Tg (glass transition temperature). Results also demonstrate that there is some transfer of toughness to the composite from bulk properties. Rate effects with the addition of nanosilica have also been shown; leading to significantly more delamination and energy absorption upon impact. Single fibre fragmentation tests will be conducted to quantify the differences in interfacial adhesion with matrix modification. This will help understand whether changes in fracture energy are due to matrix deformation or the fibre matrix interface. Plain strain compression and double notch four point bend tests will also be conducted. Examination of deformation zones will be performed using TEM (transmission electron microscopy), SEM (scanning electron microscopy) and AFM (atomic force microscopy) will aid explanation of the toughening mechanisms that have been postulated.