The influence of reprocessing by injection moulding on properties of polycarbonate has been studied. It was found that reprocessing does not affect the tensile strength, flexural strength and flexural modulus of the polycarbonate material. Fracture parameters such as fracture toughness and the material resistance to crack propagation, also showed no variation with the number of reprocessing cycles, although both were strongly dependent on sample width. Dynamic mechanical analysis (DMA) also indicated that reprocessing has no significant effect upon dynamic mechanical properties of polycarbonate. Results further indicated that the glass transition temperature of polycarbonate is not affected by reprocessing, only the range over which it occurs seems to be broadened by reprocessing due to increase in molecular weight with number of reprocessing cycles.