The RH ash which is produced by burning of RHhas a high content of silica. Depending on the proce-dure employed during burning, two types of ashes are produced, i.e. white (WRHA) and black rice husk ash(BRHA). Although a large amount of published papers exists on using WRHAand BRHAin plastics[13-28], there are a few reports on PP/RH composites[4,9,29-34].