The curing process of epoxy resins is accompanied by volume shrinkage during polymerization and cross-linking. Since the shrinkage may cause undesired stress in ready products, different strategies are applied to reduce the shrinkage, e.g. the addition of fillers, thermoplastics, rubbers and other components. Ideally, the added components contribute to improved strength and toughness of the final product or introduce even functional properties like conductivity. Mostly the added components are inert and do not interfere the polymerization and crosslinking process, but they also may cause chemical and physical changes of the product. In our studies we show that PVT is a powerful tool to identify the effect of different fillers, like carbon nanotubes (CNT), TiO2 particle, SiC nanofibers or mixtures of them, on the cure shrinkage and cure kinetics of the basic epoxy resin. The PVT data are interpreted in combination with results obtained by microscopic methods (OM, SEM , TEM), thermal (DSC, TGA), mechanical (tensile and impact tests, DMA) and structural analytical methods (FT-IR spectroscopy).