Steel and Al chips were added to solid paraffin (metal contents up to 10.2% and 8.2% by mass, resp.). The composite matrix was melted at 70 degrees C and cooled down to 40 degrees C on ice water bath to det. the cooling course and time. The addn. of metals resulted in increasing the cooling rate and decreasing the cooling time by 15.8% for steel and by 62.3% for Al chips.