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High performance epoxy biocomposite coating material was prepared using agricultural waste (rice husk) derived biosilica and characterized for visco-elastic, thermal conductivity and hydrophobic behavior. The main aim of this research was to prepare a high performance biocomposite coating material for air-duct application in aircraft. The biosilica ultra fine particle was prepared via thermo-chemical method and surface-treated using amino silane. The visco-elastic results revealed that the addition of silane-treated biosilica of 4 vol.% produced highest storage modulus of 7.2 GPa, loss factor of 0.51 and glass transition temperature of 91^οC. The highest thermal conductivity of 0.3w/mK was observed for 4 vol.% of as-received biosilica in epoxy while the silane-treated biosilica of 4 vol.% gives 0.18w/mK. Similarly, the contact angle results revealed that the silane-treated biosilica of 4 vol.% retains higher …