Electron beam modification of carbon black (N220) and carbon-silica dual phase filler has been carried out at room temperature. The increase in oxygen to carbon ratio (O/C)determined by using Electron spectroscopy for chemical analysis (ESCA) is observed.Fourier transform infra-red spectroscopy (FT-IR) studies detect a new peak at 801 cm⁻¹upon electron beam irradiation, which is due to Si-C stretching in the case of modified dualphase fillers. The absence of the peak at 3400 cm⁻¹and the presence of the peak at 1720 cm⁻¹due to aliphatic ester stretching confirm the presence of trimethylol propane triacrylate (TMPTA) on the surface. Similarly,the absence of peak band at 3400 cm⁻¹confirms chemical interaction of triethoxysilylpropyl tetrasulphide (Si-69). A decrease in dispersive component (γ_s^d) and an increase in olar component (γ_s^p) of the surface energy corroborate surface oxidation.