Fig. 4 shows the typical tensile stress versus strain curves obtained for neat resin and for filled composites. The analysis of theseresults shows that the nanoclay filling increases the tensile stiffness, but simultaneously the strength (stress at peak load) decreases. The presence of nanoparticles also reduces the strain atfailure, indicating a significant trend to embrittlement of the material. The tensile strength was calculated by dividing the peak loadby the cross section area. Table 1 summarizes the average andstandard deviation values of the tensile strength obtained fromfour tests performed for each material. Taking into account thegood dispersion with clay exfoliation achieved at least for 1%
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