Carbon-silica dual phase filler (CSDP filler) differs in many aspects from the traditional fillers currently used in rubber compounds. According to the characterization with different analytical techniques, this material consists of two phases, the carbon phase with finely divided silica domains dispersed therein. In various polymers, the CSDP filler shows higher filler-polymer and lower filler-filler interaction, In combination with a coupling agent, abrasion resistance is comparable to its carbon black counterpart, while the viscoelastic properties of the filled rubbers are improved: the hysteresis at higher temperature is depressed drastically and that at low temperature is increased.