The paraffin wax and HDPE in powder injection molded compacts should be removed before sintering and the removal of paraffin wax and HDPE is usually done by the solvent extraction and thermal debinding methods respectively The extraction of paraffin wax using n-heptane solvents which helps to remove HDPE by thermal debinding in the subsequent process by forming continuous pores within the compacts, is investigated in his work. The extraction rate of paraffin wax is proportional to the temperature of solvent extraction and the average particle size of Sr-ferrites but it is inversely proportional to the contents of paraffin wax and the sample thickness. The extraction rate of paraffin wax is observed to be lowest when the critical packing ratio of Sr-ferrite is about 60 vol% . The linear relationship between the extraction rate and the square root of the extraction time indicates that the removal of paraffin wax follows the Fickian extraction behavior.