Wood-plastic composite was prepared under Co-60 gamma irradiation with kadom (Anthrocephalus) (d= 0.36 g/cm3), a soft wood of Bangladesh, and methylmethacrylate (MMA) combined with methanol in the presence of a number of organic and inorganic acids. The impregnation was made at normal conditions. Polymer loading was determined and the change of tensile and bending strengths as a result of acid was evaluated. Most of the acids decrease both tensile and bending strengths, but adipic and oxalic acids do increase both the strengths.