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The rigid nano‐silica and soft nano‐rubber toughening effects on neat epoxy under impact loading in a range of −50 to 80 °C were investigated. Nanosilica particles (20 nm) toughened neat epoxy at all temperatures with a maximum toughening efficiency at −50 °C and lower efficiency at elevated temperatures. In contrast, except at −50 °C, nano‐rubber particles (100 nm) showed the deterioration effect...